Question 1

Which of the following best describes the difference between dehydration synthesis and hydrolysis in the context of polymer formation and breakdown?

Accepted Answer

Dehydration synthesis removes a water molecule to join monomers, while hydrolysis adds a water molecule to break a polymer into monomers.

Question 2

A patient is diagnosed with a genetic disorder that affects the structure of their glycogen. Which of the following best explains the impact of this disorder on their ability to store and release glucose?

Accepted Answer

The patient will have decreased ability to store glucose and decreased ability to release it, as abnormal glycogen structure impairs both processes.

Question 3

Which of the following statements about phospholipids in the plasma membrane is correct?

Accepted Answer

Phospholipids are amphipathic, containing both hydrophilic heads and hydrophobic tails, which allows the formation of a bilayer.

Question 4

A red blood cell is placed in a solution and begins to swell and eventually bursts. Which of the following best describes the tonicity of the solution relative to the cell?

Accepted Answer

The solution is hypotonic to the cell.

Question 5

Which of the following best explains why cholesterol is important for maintaining membrane fluidity in animal cells?

Accepted Answer

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

Question 6

Which of the following is a correct example of a structural polysaccharide and its biological function?

Accepted Answer

Cellulose, which provides structural support in plant cell walls.

Question 7

A scientist is studying a protein that denatures at high temperatures. Which of the following best describes what happens to the protein during denaturation?

Accepted Answer

The protein loses its three-dimensional shape but retains its primary structure.

Question 8

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 9

Which of the following best explains why enzymes lower the activation energy of a chemical reaction?

Accepted Answer

Enzymes provide a different pathway for the reaction with a lower activation energy.

Question 10

A cell is observed to have a high concentration of lysosomes. Which of the following is the most likely function of this cell?

Accepted Answer

Intracellular digestion and recycling of cellular components

Question 11

Which of the following best describes the role of the sodium-potassium pump in maintaining membrane potential?

Accepted Answer

It pumps sodium ions out of the cell and potassium ions into the cell, using ATP.

Question 12

Which of the following is a correct sequence of gene expression in eukaryotic cells?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 13

A mutation causes a change from a nonpolar amino acid to a charged amino acid in the active site of an enzyme. Which of the following is the most likely effect on enzyme function?

Accepted Answer

The enzyme's substrate specificity may be altered, potentially reducing its activity.

Question 14

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP releases energy when its phosphate bonds are hydrolyzed: $$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}.$$

Question 15

Which of the following best describes the function of microtubules in eukaryotic cells?

Accepted Answer

Microtubules provide tracks for organelle movement and are key components of cilia and flagella.

Question 16

A scientist adds a competitive inhibitor to an enzyme-catalyzed reaction. Which of the following best describes the effect on the reaction rate?

Accepted Answer

The inhibitor binds to the active site, and increasing substrate concentration can overcome its effect.

Question 17

Which of the following best explains the difference between exocytosis and endocytosis?

Accepted Answer

Exocytosis and endocytosis both require energy and involve vesicle formation, but exocytosis releases materials outside the cell and endocytosis brings materials in.

Question 18

Which of the following best describes the Second Law of Thermodynamics as it applies to biological systems?

Accepted Answer

Every energy transfer increases the entropy ($$S) of $$the universe.

Question 19

Which of the following is a correct example of feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway binds to an enzyme early in the pathway and inhibits its activity.

Question 20

Which of the following best explains why DNA is double-stranded while RNA is usually single-stranded?

Accepted Answer

DNA is double-stranded to allow for complementary base pairing, which is essential for accurate replication.

General Biology Study Guide: Macromolecules, Cell Structure, Membranes, and Metabolism

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