Q: Which of the following equations correctly represents the hydrolysis of ATP to ADP and inorganic phosphate, a reaction that releases energy for cellular processes?

$$ \mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy} $$

Question 1

Which of the following best describes the difference between the leading and lagging strands during DNA replication?

Accepted Answer

The leading strand is synthesized continuously in the 5' to 3' direction, while the lagging strand is synthesized discontinuously in the 5' to 3' direction.

Question 2

Which of the following equations correctly represents the hydrolysis of ATP to ADP and inorganic phosphate, a reaction that releases energy for cellular processes?

Accepted Answer

$$ \mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy} $$

Question 3

A mutation in the gene encoding DNA polymerase results in a loss of proofreading activity. Which outcome is most likely?

Accepted Answer

The cell will accumulate more mutations during DNA replication.

Question 4

Which of the following best explains why proteins can have such diverse functions in cells?

Accepted Answer

The sequence and chemical properties of amino acids allow proteins to fold into a wide variety of three-dimensional structures.

Question 5

During cellular respiration, which process produces the most ATP?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 6

Which of the following statements about the extracellular matrix (ECM) is correct?

Accepted Answer

The ECM provides structural support and mediates cell signaling.

Question 7

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain. Which of the following symptoms is most likely?

Accepted Answer

Increased production of lactic acid during exercise

Question 8

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 9

Which of the following mechanisms allows cells to regulate the function of specific proteins?

Accepted Answer

Altering the protein's three-dimensional structure through phosphorylation

Question 10

Which of the following is a correct description of an enzyme's role in a chemical reaction?

Accepted Answer

Enzymes lower the activation energy, increasing the reaction rate.

Question 11

A cell is exposed to a toxin that inhibits the function of the rough endoplasmic reticulum (RER). Which process would be most directly affected?

Accepted Answer

Synthesis of membrane-bound and secreted proteins

Question 12

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

Accepted Answer

Water is polar and can form hydrogen bonds with charged and polar molecules.

Question 13

Which of the following events occurs during the G2 phase of the cell cycle?

Accepted Answer

The cell checks for DNA damage and prepares for mitosis.

Question 14

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modification and sorting of proteins for secretion

Question 15

A scientist discovers a new protein that binds to the ECM and transmits signals into the cell. This protein is most likely a(n):

Accepted Answer

Integrin

Question 16

Which of the following best describes the relationship between genotype and phenotype?

Accepted Answer

Phenotype is the observable trait resulting from the genotype and environmental influences.

Question 17

Which of the following is a correct sequence of events in the flow of genetic information in a eukaryotic cell?

Accepted Answer

Transcription in the nucleus, translation in the cytoplasm

Question 18

Which of the following best explains why mutations in somatic cells do not get passed to offspring?

Accepted Answer

Only mutations in germ cells (sperm or egg) are inherited by offspring.

Question 19

Which of the following is a direct result of the action of RNA polymerase during transcription?

Accepted Answer

Synthesis of a complementary RNA strand from a DNA template

Question 20

A cell is unable to produce functional lysosomes. Which process would be most directly affected?

Accepted Answer

Digestion of macromolecules and cellular debris

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