Question 1

During which phase of the cell cycle does DNA replication occur, and what is the primary purpose of this process?

Accepted Answer

DNA replication occurs during the S phase to ensure each daughter cell receives a complete set of genetic information.

Question 2

Which enzyme is responsible for synthesizing the new DNA strand by adding complementary nucleotides during DNA replication?

Accepted Answer

DNA polymerase

Question 3

What is meant by 'semiconservative replication' of DNA?

Accepted Answer

Each new DNA molecule consists of one old strand and one new strand.

Question 4

A mutation occurs in the gene encoding DNA ligase. Which process would be most directly affected?

Accepted Answer

Joining of Okazaki fragments on the lagging strand

Question 5

Which of the following best describes the role of the centromere during mitosis?

Accepted Answer

It holds sister chromatids together and serves as the attachment point for spindle fibers.

Question 6

If a cell is observed to have condensed chromosomes aligned at the equator of the cell, which stage of mitosis is it in?

Accepted Answer

Metaphase

Question 7

Which of the following equations correctly represents the number of possible codons given four nitrogenous bases and three positions in a codon?

Accepted Answer

$$4^3 = 64$

Question 8

A cell is exposed to a drug that inhibits cyclin-dependent kinases (Cdks). What is the most likely outcome?

Accepted Answer

The cell cycle will be arrested, preventing progression to mitosis.

Question 9

Which of the following statements about mRNA processing is correct?

Accepted Answer

Introns are spliced out, leaving only exons to be translated.

Question 10

During translation, which site on the ribosome holds the tRNA carrying the growing polypeptide chain?

Accepted Answer

P site (polypeptide site)

Question 11

A cell is observed to have a cleavage furrow forming. Which process is occurring?

Accepted Answer

Cytokinesis

Question 12

Which of the following is a direct consequence of telomere shortening in somatic cells?

Accepted Answer

Limitation on the number of times a cell can divide

Question 13

Which molecule acts as the 'blueprint' for protein synthesis by holding the code for the order of amino acids in a polypeptide?

Accepted Answer

DNA

Question 14

What is the function of the enzyme helicase during DNA replication?

Accepted Answer

It unwinds and separates the DNA double helix.

Question 15

Which of the following best explains why some amino acids are coded by more than one codon?

Accepted Answer

Redundancy in the genetic code helps protect against transcription errors.

Question 16

A patient is diagnosed with Hutchinson-Gilford progeria syndrome. Which cellular process is most directly affected?

Accepted Answer

Stability of the nuclear envelope due to defective progerin protein

Question 17

Which of the following is NOT a function of autophagy in cells?

Accepted Answer

Triggering apoptosis in healthy cells

Question 18

Which of the following correctly matches the phase of mitosis with its main event?

Accepted Answer

Anaphase: Sister chromatids separate and are pulled toward poles

Question 19

Which of the following equations represents the relationship between surface area and volume in a cell, explaining why cells divide when they become too large?

Accepted Answer

$$	ext{Surface Area} \propto r^2$

Question 20

Which of the following is true regarding the role of tRNA during translation?

Accepted Answer

tRNA brings specific amino acids to the ribosome by matching its anticodon to the mRNA codon.

Cell Division and Protein Synthesis: Study Notes for Anatomy & Physiology

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