Question 1

During which subphase of interphase does DNA replication occur, and what is the significance of this process for cell division?

Accepted Answer

S phase; it ensures that each daughter cell receives an identical set of chromosomes.

Question 2

Which enzyme is responsible for synthesizing new DNA strands during replication, and what is the direction of synthesis?

Accepted Answer

DNA polymerase; 5' to 3' direction

Question 3

A cell is observed with chromosomes aligned at the metaphase plate. Which stage of mitosis is this, and what is the importance of this alignment?

Accepted Answer

Metaphase; it ensures that each daughter cell will receive one copy of each chromosome.

Question 4

Which of the following best describes semiconservative replication of DNA?

Accepted Answer

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

Question 5

What is the role of tRNA during translation, and how does it ensure the correct amino acid is added to the growing polypeptide?

Accepted Answer

tRNA carries amino acids and uses its anticodon to base-pair with the mRNA codon, ensuring specificity.

Question 6

A mutation changes the DNA triplet from GAA to GAG. Both code for the amino acid glutamic acid. What is this an example of?

Accepted Answer

Silent mutation

Question 7

Which of the following is NOT a function of the mitotic spindle during mitosis?

Accepted Answer

Synthesizing new DNA strands

Question 8

If a cell is exposed to a chemical that inhibits actin microfilament formation, which process would be most directly affected?

Accepted Answer

Cytokinesis

Question 9

Which of the following statements about the genetic code is TRUE?

Accepted Answer

There are more codons than amino acids, providing redundancy.

Question 10

A scientist observes a cell with a clearly visible nucleolus, uncondensed chromatin, and intact nuclear envelope. Which phase is the cell most likely in?

Accepted Answer

Interphase

Question 11

During which phase of mitosis do the centromeres of chromosomes split and sister chromatids move toward opposite poles?

Accepted Answer

Anaphase

Question 12

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

Accepted Answer

Joins Okazaki fragments on the lagging strand

Question 13

Which of the following best describes the process of apoptosis?

Accepted Answer

Programmed cell death that removes damaged or unnecessary cells

Question 14

A cell is exposed to a growth factor that stimulates cell division. Which checkpoint must be passed for the cell to commit to division?

Accepted Answer

G1 checkpoint (restriction point)

Question 15

Which of the following is a key difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 16

A mutation in a gene results in a stop codon replacing a codon for an amino acid. What is the likely result?

Accepted Answer

A truncated, likely nonfunctional protein

Question 17

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

Accepted Answer

To provide redundancy that protects against some mutations

Question 18

During translation, what is the first amino acid incorporated into a new polypeptide chain in eukaryotes?

Accepted Answer

Methionine

Question 19

Which of the following scenarios best illustrates the concept of contact inhibition in cell division?

Accepted Answer

A wound heals and cell division stops once the new tissue fills the gap.

Question 20

A cell is observed to have a cleavage furrow forming. Which process is occurring, and what is the underlying mechanism?

Accepted Answer

Cytokinesis; actin microfilaments are contracting to divide the cytoplasm

Cell Cycle and Protein Synthesis: Structure and Function in Human Anatomy & Physiology

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