Question 1

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

Accepted Answer

DNA replication occurs during the S phase, allowing each daughter cell to receive an identical set of genetic material.

Question 2

A scientist observes a cell with condensed chromosomes aligned at the cell's equator. Which stage of mitosis is this, and what is the main event occurring?

Accepted Answer

Metaphase; chromosomes are aligned at the metaphase plate, preparing for separation.

Question 3

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 4

A patient has a mutation that prevents the formation of the cleavage furrow during cell division. Which process is directly affected?

Accepted Answer

Cytokinesis

Question 5

Which of the following cell types is least likely to undergo mitosis in adult humans?

Accepted Answer

Skeletal muscle cells

Question 6

If a cell is in the G0 phase, what does this indicate about its cell cycle activity?

Accepted Answer

The cell is permanently or temporarily not dividing.

Question 7

Which enzyme is responsible for adding complementary nucleotides during the elongation phase of transcription?

Accepted Answer

RNA polymerase

Question 8

A gene contains both exons and introns. What happens to these regions during mRNA processing?

Accepted Answer

Introns are removed and exons are spliced together.

Question 9

Which of the following best explains the redundancy of the genetic code?

Accepted Answer

Some amino acids are specified by more than one codon, reducing the impact of mutations.

Question 10

During translation, what is the role of the tRNA anticodon?

Accepted Answer

It base-pairs with the complementary mRNA codon to ensure the correct amino acid is added.

Question 11

A mutation changes the DNA triplet from $$\mathrm{GGC} to$$ $$\mathrm{GCC}. $$What is the likely effect on the resulting protein?

Accepted Answer

A different amino acid may be incorporated, potentially altering protein function.

Question 12

Which of the following correctly matches the type of RNA with its function?

Accepted Answer

rRNA: forms the core of the ribosome and catalyzes peptide bond formation

Question 13

Which of the following best describes the process of transcription?

Accepted Answer

The synthesis of an RNA molecule from a DNA template.

Question 14

A cell is exposed to a chemical that inhibits RNA polymerase. Which process will be directly affected?

Accepted Answer

Transcription

Question 15

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

Accepted Answer

DNA → RNA → Protein

Question 16

If a mutation introduces a premature stop codon (UAG) into an mRNA sequence, what is the most likely outcome?

Accepted Answer

Translation will terminate early, resulting in a truncated protein.

Question 17

Which of the following best explains why redundancy in the genetic code is beneficial?

Accepted Answer

It reduces the likelihood that a point mutation will alter the amino acid sequence of a protein.

Question 18

A cell is observed to have a ring of actin microfilaments forming a cleavage furrow. Which stage of the cell cycle is this cell most likely in?

Accepted Answer

Cytokinesis

Question 19

Which of the following statements about the relationship between DNA, mRNA, and tRNA is correct?

Accepted Answer

mRNA codons are base-paired with tRNA anticodons to ensure correct amino acid incorporation.

Question 20

A researcher is studying a gene with the following DNA sequence: $$\mathrm{TAC}. $$What will be the corresponding mRNA codon and tRNA anticodon?

Accepted Answer

mRNA: $$\mathrm{AUG}$$; tRNA: $$\mathrm{UAC}$$

Cell Cycle and Genetic Information Flow: Study Notes for Anatomy & Physiology

Guida di studio - Domande di pratica

Study guide - Flashcard