Question 1

Which phase of the cell cycle is characterized by vigorous cell growth and metabolism, and what happens if a cell does not receive the proper 'go' signal at this stage?

Accepted Answer

G1 phase; the cell enters G0 and stops dividing

Question 2

During DNA replication, which enzyme is responsible for joining together the Okazaki fragments on the lagging strand?

Accepted Answer

DNA ligase

Question 3

Why is DNA replication described as 'semiconservative'?

Accepted Answer

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

Question 4

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

Accepted Answer

Metaphase; ensures equal distribution of chromosomes to daughter cells

Question 5

Which checkpoint in the cell cycle is considered the most critical for determining whether a cell will divide, and what happens if the cell does not pass this checkpoint?

Accepted Answer

G1 checkpoint; the cell enters G0 phase

Question 6

Which of the following best describes the role of tRNA during translation?

Accepted Answer

It brings specific amino acids to the ribosome based on codon-anticodon pairing

Question 7

A mutation causes a cell to lose contact inhibition. What is the most likely consequence?

Accepted Answer

The cell will continue to divide uncontrollably, possibly leading to tumor formation

Question 8

Which of the following codons is a stop codon in mRNA translation?

Accepted Answer

$$\mathrm{UGA}$$

Question 9

What is the function of cyclin-CDK complexes in the cell cycle?

Accepted Answer

They activate enzyme cascades that prepare the cell for division

Question 10

Which process is responsible for removing noncoding regions (introns) from pre-mRNA before translation?

Accepted Answer

RNA splicing by spliceosomes

Question 11

A scientist observes a cell with a visible cleavage furrow and two distinct nuclei forming. Which stage of cell division is this cell most likely in?

Accepted Answer

Telophase and cytokinesis

Question 12

Which enzyme is responsible for synthesizing the new mRNA strand during transcription?

Accepted Answer

RNA polymerase

Question 13

What is the main difference between ribosomal RNA (rRNA) and transfer RNA (tRNA)?

Accepted Answer

rRNA forms the structural and catalytic core of ribosomes, tRNA brings amino acids to the ribosome

Question 14

Which of the following best explains why telomerase activity is associated with cancer cells?

Accepted Answer

Telomerase lengthens telomeres, allowing unlimited cell division

Question 15

A patient is diagnosed with progeria, a disease that mimics accelerated aging. Which cellular structure is primarily affected in this condition?

Accepted Answer

Nuclear lamina

Question 16

Which of the following best describes the function of ubiquitin in the cell?

Accepted Answer

It marks proteins for degradation by proteasomes

Question 17

During which phase of mitosis do sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 18

Which of the following is a real-life consequence of a mutation that prevents the destruction of cyclins after mitosis?

Accepted Answer

Cells might continuously divide, increasing cancer risk

Question 19

Which of the following best describes the role of the promoter region during transcription?

Accepted Answer

It is the binding site for RNA polymerase to initiate transcription

Question 20

A cell is exposed to a chemical that inhibits the formation of the mitotic spindle. Which stage of mitosis would be directly affected, and what would be the likely outcome?

Accepted Answer

Metaphase; chromosomes would not align at the metaphase plate

Cell Division and Protein Synthesis: Structure, Regulation, and Clinical Relevance

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