Q: Which of the following best describes the flow of genetic information in a eukaryotic cell?

$$\text{DNA} \to \text{RNA} \to \text{Protein}$$

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 into a polymer, 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 phospholipid bilayers, making their cell membranes less fluid at low temperatures. Which of the following changes in membrane composition would most likely help restore normal membrane fluidity?

Accepted Answer

Increasing the proportion of unsaturated fatty acids in the membrane.

Question 3

Which of the following is a structural polysaccharide found in the exoskeletons of arthropods and the cell walls of fungi?

Accepted Answer

Chitin

Question 4

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

Accepted Answer

The protein loses its three-dimensional shape due to the disruption of hydrogen bonds and other interactions.

Question 5

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains the base thymine, while RNA contains the base uracil.

Question 6

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 7

Which of the following best explains why cholesterol is important in animal cell membranes?

Accepted Answer

Cholesterol stabilizes membrane fluidity across temperature changes.

Question 8

Which of the following statements about enzyme catalysis is correct?

Accepted Answer

Enzymes lower the activation energy, allowing reactions to proceed more rapidly.

Question 9

A cell is observed to engulf large particles by wrapping its plasma membrane around them and forming a vesicle. Which process is being described?

Accepted Answer

Phagocytosis

Question 10

Which of the following best describes the role of the sodium-potassium pump in animal cells?

Accepted Answer

It uses ATP to move sodium ions out of the cell and potassium ions into the cell against their concentration gradients.

Question 11

Which of the following amino acids is classified as aromatic?

Accepted Answer

Phenylalanine

Question 12

A mutation causes a protein to lose its ability to bind to its substrate at the active site. Which model best explains the specificity of enzyme-substrate interaction?

Accepted Answer

Induced fit model

Question 13

Which of the following best describes the flow of genetic information in a eukaryotic cell?

Accepted Answer

$$	ext{DNA} 	o 	ext{RNA} 	o 	ext{Protein}$$

Question 14

Which of the following is a correct example of a catabolic pathway?

Accepted Answer

Breakdown of glucose during cellular respiration

Question 15

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

Accepted Answer

The inhibitor binds to the active site, preventing substrate binding.

Question 16

Which of the following best explains why facilitated diffusion is necessary for glucose transport across the plasma membrane?

Accepted Answer

Glucose is a large, polar molecule that requires a transport protein to cross the membrane.

Question 17

Which of the following statements about the second law of thermodynamics is correct?

Accepted Answer

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

Question 18

Which of the following best describes the function of the rough endoplasmic reticulum (RER) in eukaryotic cells?

Accepted Answer

Synthesis of proteins destined for secretion or membrane insertion

Question 19

A plant cell is placed in a hypertonic solution. What will most likely happen to the cell?

Accepted Answer

The cell will lose water and undergo plasmolysis.

Question 20

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

Accepted Answer

They provide tracks for vesicle movement and are key components of cilia and flagella.

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

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