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Unit 1 Vocabulary Quiz

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Home AP Practice Tests AP Biology Unit 1 Vocabulary Quiz

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AP Biology Unit 1 Vocabulary: Chemistry of Life

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Question 1 of 50

1. Question

Which of the following best describes an isotope?

Atoms with different numbers of protons.
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Atoms with different numbers of valence shells.
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Atoms with different numbers of neutrons.
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Atoms with different electrical charges.
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Question 2 of 50

2. Question

What is the defining characteristic of an ion?

An atom with a neutral charge.
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An atom that has gained or lost electrons.
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An atom that has gained or lost protons.
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An atom that has gained or lost neutrons.
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Question 3 of 50

3. Question

Which electrons are specifically referred to as valence electrons?

Electrons in the innermost shell.
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Electrons that have been emitted as radiation.
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Electrons in the outermost shell.
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Electrons in the nucleus.
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Question 4 of 50

4. Question

Which statement describes the formation of a covalent bond?

The attraction between hydrogen and oxygen.
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The transfer of electrons between atoms.
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The attraction between opposite charges.
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The sharing of a pair of valence electrons.
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Question 5 of 50

5. Question

Which of the following occurs in a polar covalent bond?

Electrons are shared unequally between atoms.
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Electrons are shared equally between atoms.
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Electrons are delocalized across a metal lattice.
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Electrons are transferred to the more electronegative atom.
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Question 6 of 50

6. Question

In a nonpolar covalent bond, how are electrons distributed?

Electrons are lost to the surrounding environment.
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Electrons are pulled toward one nucleus.
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Electrons are shared equally between atoms.
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Electrons are shared between a metal and a nonmetal atom.
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Question 7 of 50

7. Question

What does the term electronegativity measure in an atom?

The total number of electrons in an atom.
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The energy required to remove an electron.
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The magnitude of the atom’s negative charge.
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The attraction for shared electrons in a bond.
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Question 8 of 50

8. Question

What is the primary force holding an ionic bond together?

The sharing of two electrons.
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The attraction between two nonpolar molecules.
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The overlap of atomic orbitals between atoms.
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The attraction between oppositely charged ions.
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Question 9 of 50

9. Question

How is a polymer defined in biological chemistry?

A small molecule used to build larger structures.
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A single unit that cannot be broken down further.
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A molecule that contains only carbon and hydrogen.
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A long molecule consisting of many similar building blocks.
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Question 10 of 50

10. Question

What is the role of a monomer in a biological system?

It acts as the final, functional molecule.
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It serves as a repeating building block for polymers.
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It catalyzes chemical reactions with the cell.
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It provides the structural rigidness of the cell wall.
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Question 11 of 50

11. Question

Which of the following describes a hydrophilic substance?

A substance that has an affinity for water.
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A substance that is composed entirely of lipids.
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A substance that repels water molecules.
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A substance that lacks any electrical charge.
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Question 12 of 50

12. Question

What is a characteristic property of hydrophobic molecules?

They do not dissolve easily in water.
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They are highly soluble in aqueous solutions.
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They consist primarily of polar covalent bonds.
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They form hydrogen bonds with water molecules.
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Question 13 of 50

13. Question

Which term describes a molecule that has an uneven distribution of electrical charges due to differences in electronegativity?

Nonpolar
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Hydrophobic
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Polar
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Ionic
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Question 14 of 50

14. Question

What is the specific name for the weak attraction between the partial positive charge of a hydrogen atom in one water molecule and the partial negative charge of an oxygen atom in another?

Ionic bond
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Hydrogen bond
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Peptide bond
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Covalent bond
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Question 15 of 50

15. Question

Water molecules sticking to other water molecules via hydrogen bonding is a property known as:

Cohesion
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Specific Heat
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Adhesion
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Capillary action
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Question 16 of 50

16. Question

Which property allows water to travel upward against gravity through the xylem of a plant by sticking to the cell walls?

Surface tension
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Cohesion
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Adhesion
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Heat of vaporization
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Question 17 of 50

17. Question

What property of water prevents small insects, like water striders, from sinking as they walk across a pond?

Surface tension
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Density
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Specific heat
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Adhesion
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Question 18 of 50

18. Question

Water is able to absorb a significant amount of heat energy before its temperature increases. This resistance to temperature change is called:

Heat of vaporization
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Thermal conductivity
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Evaporative cooling
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Specific heat
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Question 19 of 50

19. Question

Which property of water contributes most significantly to the cooling effect observed during sweating in humans?

Specific heat
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Cohesion
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Hydrolysis
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Heat of vaporization
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Question 20 of 50

20. Question

In the formation of a polymer from monomers, a water molecule is released. This type of reaction is known as a:

Redox reaction
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Dehydration synthesis reaction
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Hydrolysis reaction
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Exergonic reaction
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Question 21 of 50

21. Question

When a complex carbohydrate is broken down into simple sugars during digestion, water is consumed. This process is called a:

Dehydration synthesis reaction
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Ionic dissociation
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Metabolic synthesis reaction
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Hydrolysis reaction
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Question 22 of 50

22. Question

Which ion is primarily responsible for the acidity of a solution and is represented as H⁺?

Hydrogen ion
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Hydroxide ion
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Ammonium ion
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Hydronium ion
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Question 23 of 50

23. Question

A solution is considered basic (alkaline) if it has a high concentration of which specific ion?

Chloride ion
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Hydroxide ion
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Hydrogen ion
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Bicarbonate ion
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Question 24 of 50

24. Question

Which category of macromolecules is unique because its members are grouped together based on their hydrophobic properties rather than being defined by a specific monomer-to-polymer structure?

Nucleic Acid
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Carbohydrate
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Protein
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Lipid
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Question 25 of 50

25. Question

A researcher identifies a five-carbon sugar with a hydroxyl group attached to the 2’ carbon. Which specific molecule has been identified?

Ribose
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Deoxyribose
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Glucose
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Fructose
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Question 26 of 50

26. Question

When two monosaccharides, such as glucose and fructose, are joined via a dehydration synthesis reaction, what is the resulting molecule classified as?

Monosaccharide
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Polysaccharide
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Disaccharide
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Triglyceride
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Question 27 of 50

27. Question

Plants use large, complex chains of glucose units like starch for energy storage and cellulose for structural support. These molecules are examples of a:

Polypeptide
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Monosaccharide
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Disaccharide
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Polysaccharide
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Question 28 of 50

28. Question

Which term describes the simplest form of carbohydrate, typically existing as a single sugar molecule with the general formula (CH₂ O)_n?

Phospholipid
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Disaccharide
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Monosaccharide
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Polysaccharide
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Question 29 of 50

29. Question

Which organic molecule consists of a three-carbon chain with a hydroxyl group (−OH) attached to each carbon, serving as the backbone for triglycerides and phospholipids?

Cholesterol
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Fatty acid
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Steroid
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Glycerol
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Question 30 of 50

30. Question

Which component of a lipid consists of a long hydrocarbon chain attached to a terminal carboxyl group (−COOH)?

Phospholipid
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Steroid
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Glycerol
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Fatty acid
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Question 31 of 50

31. Question

How is a lipid classified if all carbon-carbon bonds within its hydrocarbon tail are single bonds allowing the maximum number of hydrogen atoms to bind?

Steroid
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Saturated
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Unsaturated
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Phospholipid
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Question 32 of 50

32. Question

Which term describes a fatty acid tail that contains one or more double bonds (C=C), producing kinks that increase membrane fluidity?

Glycerol
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Cholesterol
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Saturated
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Unsaturated
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Question 33 of 50

33. Question

Which weak intermolecular interaction occurs between nonpolar molecules due to transient, fluctuating dipoles created by constantly moving electrons?

Covalent bond
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Van der Waals force
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Ionic bond
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hydrogen bond
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Question 34 of 50

34. Question

Which class of lipids is characterized by a core carbon skeleton consisting of four interconnected alkyl rings rather than long hydrocarbon chains?

Triglyceride
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Steroid
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Phospholipid
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Fatty acid
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Question 35 of 50

35. Question

Which specific steroid molecule acts as a membrane fluidity buffer in animal cells, preventing membranes from becoming too fluid at high temperatures or too rigid at low temperatures?

Cholesterol
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Unsaturated fatty acid
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Unsaturated fatty acid
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Glycerol
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Question 36 of 50

36. Question

Which major amphipathic lipid consists of a hydrophilic phosphate head and two hydrophobic fatty acid tails, forming the structural foundation of cell membranes?

Steroid
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Cholesterol
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Triglyceride
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Phospholipid
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Question 37 of 50

37. Question

Which variable component of a nucleic acid monomer determines whether a specific unit is classified as a purine or pyrimidine?

Amino Acid
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Nitrogenous base
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Phosphate group
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Pentose sugar
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Question 38 of 50

38. Question

What is the basic repeating structural unit of a nucleic acid, composed of a five-carbon sugar, a phosphate group, and a nitrogenous base?

Nucleotide
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Nucleoside
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Codon
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Phosphodiester bond
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Question 39 of 50

39. Question

Which terminus of a single polynucleotide strand is characterized by a free phosphate group attached to the fifth carbon of the terminal pentose sugar?

5’ end
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C-terminus
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N-terminus
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3’ end
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Question 40 of 50

40. Question

Which molecular geometry describes the overall three-dimensional shape of double-stranded DNA, formed by two helical chains wrapped around a central axis?

Triple helix
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Beta-pleated sheet
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Double helix
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Alpha helix
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Question 41 of 50

41. Question

What structural orientation describes the arrangement of double-stranded DNA where one strand runs in the 5’→3′ direction while the opposite strand runs 3’→5′?

Conservative
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Antiparallel
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Parallel
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Semiconservative
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Question 42 of 50

42. Question

Which term describes the specific base-pairing rules (A with T, G with C) that allow one DNA strand to serve as an exact template during replication and transcription?

Semiconservative
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Complementary
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Conservative
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Matching
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Question 43 of 50

43. Question

Which foundational concept in molecular biology describes the sequential flow of genetic information within a biological system from DNA to RNA to protein?

Central dogma
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Cell theory
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Evolutionary theory
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Endosymbiotic theory
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Question 44 of 50

44. Question

Which specific covalent linkage is formed between the carboxyl group of one amino acid and the amino group of another during a dehydration synthesis reaction?

Ester linkage
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Phosphodiester bond
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Peptide bond
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Glycosidic linkage
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Question 45 of 50

45. Question

What term describes an unbranched, continuous polymer chain composed of amino acid monomers linked together sequentially prior to folding into a functional three-dimensional shape?

Polysaccharide
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Polypeptide
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Polyhydrocarbon
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Polynucleotide
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Question 46 of 50

46. Question

Which biological macromolecule consists of one or more polypeptide chains folded into a specific, biologically active three-dimensional conformation?

Protein
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Carbohydrates
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Nucleic acid
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Triglyceride
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Question 47 of 50

47. Question

Which level of protein organization refers specifically to the precise, genetically determined linear sequence of amino acids in a polypeptide chain?

Tertiary structure
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Secondary structure
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Quaternary structure
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Primary structure
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Question 48 of 50

48. Question

Which level of protein organization refers specifically to the precise, genetically determined linear sequence of amino acids in a polypeptide chain?

Tertiary structure
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Primary structure
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Secondary structure
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Quaternary structure
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Question 49 of 50

49. Question

Which structural motif in proteins is characterized by a delicate coil stabilized by hydrogen bonding between every fourth amino acid in the polypeptide backbone?

Alpha helix
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Hydrophobic core
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Disulfide bridge
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Beta sheet
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Question 50 of 50

50. Question

Which secondary structure element consists of two or more polypeptide strands aligned parallel or antiparallel to each other, stabilized by hydrogen bonds between backbone segments?

Zinc finger
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Alpha helix
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Beta sheet
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Coiled polypeptide
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