Question 1

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, resulting in charged ions, while covalent bonds involve the sharing of electron pairs between atoms.

Question 2

A scientist is studying a protein that loses its function when exposed to high temperatures. Which level of protein structure is most directly affected by this denaturation?

Accepted Answer

Tertiary structure

Question 3

Which of the following best explains why water is an excellent solvent for many biological molecules?

Accepted Answer

Water is a polar molecule, allowing it to form hydrogen bonds with charged and polar substances.

Question 4

Which of the following is a correct description of the sodium-potassium pump?

Accepted Answer

It uses energy from ATP to move sodium ions out of the cell and potassium ions into the cell, establishing an electrochemical gradient.

Question 5

Which of the following best describes the relationship between the structure and function of carbohydrates?

Accepted Answer

The branching and length of carbohydrate chains affect their ability to store energy and provide structural support.

Question 6

A patient is diagnosed with a disorder that prevents the formation of phospholipids. Which cellular structure would be most directly affected?

Accepted Answer

Cell membrane

Question 7

Which of the following equations correctly represents the dissociation of water?

Accepted Answer

$$\mathrm{H}_2\mathrm{O} \rightarrow \mathrm{H}^+ + \mathrm{OH}^-$$

Question 8

Which of the following best explains why saturated fatty acids are solid at room temperature while unsaturated fatty acids are liquid?

Accepted Answer

Saturated fatty acids have no double bonds, allowing them to pack tightly, while unsaturated fatty acids have double bonds that create kinks and prevent tight packing.

Question 9

Which of the following is an example of active transport in cells?

Accepted Answer

Movement of sodium ions against their concentration gradient using ATP

Question 10

Which of the following statements about protein folding is correct?

Accepted Answer

Denaturation can lead to loss of protein function by disrupting secondary and tertiary structures.

Question 11

A solution contains $$0.01$$ moles of $$\mathrm{H}^+$$ per liter. What is the pH of this solution?

Accepted Answer

$$2$$

Question 12

Which of the following best describes the difference between simple diffusion and facilitated diffusion?

Accepted Answer

Facilitated diffusion requires a membrane protein to transport molecules across the membrane, while simple diffusion does not.

Question 13

Which of the following is a correct comparison of starch and cellulose?

Accepted Answer

Both are composed of glucose monomers, but starch has $$\alpha-$$glycosidic linkages while cellulose has $$\beta-$$glycosidic linkages.

Question 14

Which of the following best explains why phospholipids form bilayers in aqueous environments?

Accepted Answer

The hydrophilic heads interact with water while the hydrophobic tails avoid water, resulting in a bilayer.

Question 15

A mutation causes a protein to lose its quaternary structure but retain its tertiary structure. Which of the following is most likely to occur?

Accepted Answer

The protein will lose its ability to function as a multimeric complex.

Question 16

Which of the following is a property of water that is critical for life?

Accepted Answer

Ability to form hydrogen bonds, leading to high cohesion and surface tension

Question 17

Which of the following best describes the role of cholesterol in animal cell membranes?

Accepted Answer

Cholesterol increases membrane fluidity at low temperatures and decreases fluidity at high temperatures.

Question 18

Which of the following is an example of a hypothesis that could be tested using the scientific method?

Accepted Answer

Plants grow faster in blue light than in red light.

Question 19

Which of the following best explains why glucose and galactose are considered structural isomers?

Accepted Answer

They have the same molecular formula but different arrangements of atoms.

Question 20

Which of the following best describes the function of a dehydration synthesis reaction in the formation of biological macromolecules?

Accepted Answer

It joins monomers together by removing a molecule of water.

General Biology: Structure and Function of Biomolecules

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