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Unit 4 Vocabulary Quiz

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AP Biology Unit 4 Vocabulary:
Cell Communication & Cell Cycle

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Question 1 of 50

1. Question

In the context of evolutionary biology and cell signaling in group behaviors like quorum sensing, how is a population strictly defined?

An aggregate of single celled organisms displaying identical phenotype traits.
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All living organisms interacting within a specific geographical ecosystem.
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A collection of different species sharing a common communication mechanism.
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A group of individuals of the same species living in the same area.
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Question 2 of 50

2. Question

What primary functional role do signaling molecules play in cellular communication pathways?

They function as primary enzymatic catalysts for intracellular respiration.
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They serve as direct structural support across the extracellular matrix.
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They act as chemical messengers carrying signals between cells.
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They form lipid bilayers to compartmentalize metabolic reactions.
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Question 3 of 50

3. Question

What characterizes a ligand in cell signaling pathways?

A cytosolic enzyme responsible for degrading cyclic nucleotides.
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A molecule that binds specifically to a receptor molecule.
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A transmembrane domain that anchors proteins to the cytoskeleton.
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A protein that hydrolyzes ATP during active membrane transport.
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Question 4 of 50

4. Question

How do hormones differ fundamentally from local signaling molecules like paracrine factors?

They are composed entirely of hydrophobic steroid chemical structures.
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They act only on immediate neighboring cells via direct junction diffusion.
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They travel long distances via bodily fluids to target cells.
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They function exclusively through intracellular nuclear receptors.
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Question 5 of 50

5. Question

Which structural feature enables direct cytoplasmic communication between adjacent plant cells?

Tight junctions
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Desmosomes
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Gap junctions
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Plasmodesmata
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Question 6 of 50

6. Question

Which phase of cell signaling best defines signal transduction?

Conversion of an extracellular signal into a specific intracellular response.
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Physical uptake and endocytosis of a ligand into the lysosome.
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Synthesis and secretion of signaling molecules into extracellular space.
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Direct binding of a signaling molecule to its specific cell-surface receptor.
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Question 7 of 50

7. Question

Upon ligand activation, what immediate event occurs at a G protein-coupled receptor (GPCR)?

The receptor opens a central pore allowing direct influx of sodium ions.
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The receptor dimerizes and phosphorylates its intracellular proteins.
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The receptor triggers GDP replacement with GTP on a G protein.
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The receptor translocates directly into the nucleus to regulae gene transcription.
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Question 8 of 50

8. Question

What is the primary synthesis mechanism and biochemical role of cAMP in cellular signaling?

Synthesized by mitochondrial ATP synthase during oxidative phosphorylation.
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Generated by G proteins to directly phosphorylate target transcription factors.
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Formed from ATP by adenylyl cyclase to activate protein kinase A.
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Produced by phospholipase C to directly open endoplasmic reticulum calcium channels.
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Question 9 of 50

9. Question

Which statement correctly distinguishes a second messenger from a primary messenger?

Second messengers are transmembrane receptors that bind extracellular signaling ligands.
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Second messengers are extracellular ligands released during autocrine stimulation pathways.
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Second messengers are nuclear proteins that bind directly to DNA enhancer elements.
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Second messengers are small, non-protein molecules diffusing through the cytosol.
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Question 10 of 50

10. Question

What exact enzymatic activity defines the function of a kinase?

Synthesizing cyclic nucleotides from nucleoside triphosphates.
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Removing phosphate groups from proteins via hydrolysis reactions.
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Transferring a phosphate group from ATP to a protein substrate.
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Cleaving peptide bonds during ubiquitin-mediated protein degradation.
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Question 11 of 50

11. Question

In a signal transduction cascade, how is signal amplification primarily achieved?

The target cell synthesizes extra membrane receptors during ligand exposure.
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Multiple ligands bind simultaneously to a single cell-surface receptor protein.
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Second messengers undergo polymerization to form large signaling complexes.
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An activated enzyme catalyzes the production of numerous downstream products.
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Question 12 of 50

12. Question

What key activation step differentiates a receptor-protein kinase (such as RTK) from a G protein-coupled receptor?

The receptor acts as a direct passive pore for rapid ion influx across the membrane.
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Ligand binding causes direct dissociation of heterotrimeric subunits.
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Ligand binding induces receptor dimerization followed by phosphorylation.
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The receptor cleaves membrane phospholipids to generate soluble inositol phosphates.
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Question 13 of 50

13. Question

What is the primary mechanism by which a ligand-gated channel alters cell function?

Ligand entry through the channel triggers direct transcription factor degradation.
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Binding of a ligand opens or closes a membrane pore for ion flow.
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Ligand binding stimulates intrinsic kinase activity to hydrolyze ATP.
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The channel transports whole signaling proteins into the nucleus via nuclear pores.
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Question 14 of 50

14. Question

When a signal transduction pathway leads to a change in gene expression, what is the target output?

Direct assembly of ribosomal subunits within cytosolic stress granules.
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Regulation of transcription factor activity to alter mRNA production.
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Rapid alteration of plasma membrane fluidity via phospholipid flipping.
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Immediate structural modification of existing cytoplasmic metabolic enzymes.
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Question 15 of 50

15. Question

Which statement best describes a organism’s phenotype?

The specific sequence of amino acids assembled into functional cellular protein complexes.
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The observable physical and physiological traits determined by genetic material and environmental factors.
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The proportion of dominant alleles relative to recessive alleles within a breeding population.
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The complete set of inherited alleles present in an organism’s genomic DNA sequence.
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Question 16 of 50

16. Question

In cellular signaling, what is the primary role of a chemical agonist?

To catalyze the degradation of secondary messenger molecules within the cytoplasm.
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To transport hydrophobic signaling molecules across the phospholipid bilayer via simple diffusion.
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To bind to a receptor site without activating it, thereby preventing ligand binding.
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To bind to a specific receptor and induce a biological response by mimicking natural ligands.
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Question 17 of 50

17. Question

How does a biological antagonist function during receptor-mediated cell signaling?

By binding to a receptor and enhancing its affinity for signaling ligands.
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By phosphorylating target intracellular enzymes to initiate downstream cascades.
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By binding to a receptor and inhibiting or blocking its normal biological signaling function.
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By acting as a transcription factor that upregulates receptor gene expression in the nucleus.
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Question 18 of 50

18. Question

Which definition accurately characterizes a genetic mutation?

A temporary modification of histone proteins that reversibly alters gene transcription rates.
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A permanent structural alteration in the nucleotide sequence of an organism’s genome.
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The misfolding of functional polypeptides following translation on membrane bound ribosomes.
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An error in messenger RNA splicing during post transcriptional processing in the cytoplasm.
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Question 19 of 50

19. Question

In biological homeostatic systems, what does the term ‘set point’ represent?

The maximum threshold of physiological stress an organism can withstand before cellular death.
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The initial resting membrane potential established by sodium-potassium ATPase ion pumps.
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The point during embryonic development when cellular differentiation becomes irreversible.
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The target physiological value or range around which a homeostatic system maintains stability.
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Question 20 of 50

20. Question

What is the key mechanism of a negative feedback loop in maintaining homeostasis?

It completely shuts down physiological processes regardless of internal environmental cues.
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It counteracts a physiological stimulus to return the system toward its established set point.
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It amplifies an initial biological stimulus to rapidly drive a physiological process to completion.
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It prevents regulatory enzymes from binding substrate molecules by degrading the active site.
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Question 21 of 50

21. Question

Which statement correctly describes the function of a positive feedback loop?

It prevents metabolic pathways from producing excess product via end-product inhibition.
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It maintains osmotic balance by reversing water movement across semipermeable membranes.
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It reduces physiological variation by continuously adjusting variables toward a set point.
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It amplifies the output of a process until a specific endpoint or outcome is reached.
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Question 22 of 50

22. Question

Which process refers to the complete sequence of growth, DNA replication, and division that a eukaryotic cell undergoes from its origin until it divides into two offspring cells?

Mitosis
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Binary fission
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Interphase
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Cell cycle
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Question 23 of 50

23. Question

During which primary interval of the cell cycle does a eukaryotic cell spend most of its life growing, performing metabolic functions, and duplicating its cellular contents prior to division?

Cell division
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M phase
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Cytokinesis
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Interphase
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Question 24 of 50

24. Question

Which specific sub-phase of interphase is dedicated to nuclear DNA replication, resulting in the duplication of the cell’s genetic material?

M phase
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S phase
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Cytokinesis
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Binary fission
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Question 25 of 50

25. Question

What is the term for one of the two identical copies of a replicated chromosome that remain joined together at the centromere until anaphase?

Sister chromatid
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Chromatin
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Homologous chromosome
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Centrosome
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Question 26 of 50

26. Question

Which general biological process allows a parental cell to distribute its genetic material and split into two or more distinct daughter cells?

Cell division
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Interphase
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Transcription
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Fertilization
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Question 27 of 50

27. Question

Prokaryotes like Escherichia coli reproduce asexually by replicating their single circular chromosome and dividing the cell into two equal parts. What is this method called?

Mitosis
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Binary fission
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S phase
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Sexual reproduction
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Question 28 of 50

28. Question

Which reproductive strategy involves the fusion of two haploid gametes to form a genetically unique diploid zygote?

Cytokinesis
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Mitosis
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Sexual reproduction
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Binary fission
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Question 29 of 50

29. Question

Which discrete structure consists of a single continuous molecule of double-stranded DNA wrapped around histone proteins, carrying genomic information?

Sister chromatid
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Nucleolus
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Centrosome
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Chromosome
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Question 30 of 50

30. Question

During which division period does a eukaryotic cell divide its duplicated nuclear genome via prophase, metaphase, anaphase, and telophase?

Binary fission
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Cytokinesis
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Interphase
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Mitosis
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Question 31 of 50

31. Question

What is the collective term for the combined cell cycle segment that encompasses nuclear division (mitosis) and cytoplasmic division (cytokinesis)?

Interphase
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M phase
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Binary fission
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S phase
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Question 32 of 50

32. Question

In animal cells, a cleavage furrow forms to pinch the cell membrane into two; in plant cells, a cell plate forms. What is this physical cytoplasm-dividing step called?

S phase
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Mitosis
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Cytokinesis
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Interphase
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Question 33 of 50

33. Question

Which specific region of a duplicated chromosome holds the two sister chromatids tightly together and serves as the primary site for kinetochore assembly?

Centromere
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Centriole
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Telomere
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Centrosome
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Question 34 of 50

34. Question

During which sub-phase of interphase does a newly divided cell undergo rapid growth, execute metabolic functions, and synthesize proteins prior to DNA duplication?

Gap one phase
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Gap two phase
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Gap zero phase
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Synthesis phase
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Question 35 of 50

35. Question

In which phase of interphase does the cell complete final preparations for division, such as synthesizing tubulin proteins and duplicating centrosomes after DNA synthesis is complete?

Synthesis phase
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Gap zero phase
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Gap one phase
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Gap two phase
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Question 36 of 50

36. Question

Which term describes a non-dividing, resting metabolic state where cells temporarily or permanently exit the active cell cycle?

Gap zero phase
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Restriction point
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Gap one phase
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Interphase
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Question 37 of 50

37. Question

What is the complex of genomic DNA and histone proteins that remains loosely condensed in the nucleus during interphase?

Nucleosome
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Centrosome
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Chromatin
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Chromatid
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Question 38 of 50

38. Question

During which mitotic stage do chromatin fibers condense into visible individual chromosomes, the nucleolus disappears, and the early spindle begins to assemble?

Telophase
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Prophase
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Metaphase
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Prometaphase
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Question 39 of 50

39. Question

Which cellular apparatus composed of microtubules and associated motor proteins coordinates chromosome movement and segregation during mitosis?

Cell plate
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Mitotic spindle
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Cleavage furrow
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Kinetochore
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Question 40 of 50

40. Question

Which main microtubule-organizing center in eukaryotic cells duplicates during interphase and migrates to opposite poles to organize the spindle apparatus?

Centrosome
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Kinetochore
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Acrosome
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Centromere
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Question 41 of 50

41. Question

In which mitotic phase does the nuclear envelope fully fragment, allowing spindle microtubules to enter the nuclear region and bind to kinetochores?

Prophase
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Anaphase
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Prometaphase
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Metaphase
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Question 42 of 50

42. Question

During which phase of mitosis do all chromosomes align along the equatorial plane of the cell under balanced tension from opposite spindle poles?

Prometaphase
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Telophase
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Anaphase
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Metaphase
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Question 43 of 50

43. Question

Which mitotic stage begins as cohesin proteins are cleaved, allowing sister chromatids to separate and move toward opposite ends of the cell?

Telophase
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Anaphase
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Metaphase
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Cytokinesis
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Question 44 of 50

44. Question

During which stage of nuclear division do daughter chromosomes decondense back into diffuse chromatin while nuclear envelopes reform around each set?

Prophase
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Anaphase
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Metaphase
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Telophase
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Question 45 of 50

45. Question

Which pathological condition results from uncontrolled cell division caused by genetic mutations that override normal cell cycle control mechanisms?

Hypertrophy
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Cancer
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Senescence
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Apoptosis
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Question 46 of 50

46. Question

Which type of regulatory protein fluctuates in concentration throughout the cell cycle to bind and activate specific kinase enzymes at distinct transition points?

Histone
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Cyclin-dependent kinase
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Cohesion
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Cyclin
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Question 47 of 50

47. Question

Which enzyme maintains a relatively constant concentration in the cell and phosphorylates target proteins to advance the cell cycle when activated by cyclin?

Cyclin dependent kinase
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Cyclin
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DNA polymerase
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Separase
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Question 48 of 50

48. Question

What is a critical control point in the cell cycle where stop and go-ahead signals regulate whether a cell proceeds to the next division stage?

Promoter
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Centromere
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Checkpoint
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Restriction site
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Question 49 of 50

49. Question

Which fundamental biochemical process utilizes DNA polymerases to duplicate a cell’s genomic material during the synthesis phase of the cell cycle?

Transcription
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Translation
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DNA replication
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Recombination
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Question 50 of 50

50. Question

Which programmed, highly regulated process of cellular self-destruction removes damaged, infected, or excess cells without causing inflammation?

Autophagy
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Necrosis
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Apoptosis
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Lysis
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