Question 1

Which phase of the cell cycle is primarily responsible for the synthesis of DNA in preparation for cell division?

Accepted Answer

S phase

Question 2

During which stage of mitosis do duplicated chromosomes align at the cell's equator?

Accepted Answer

Metaphase

Question 3

What is the main function of DNA polymerase during DNA replication?

Accepted Answer

Synthesizing new complementary DNA strands

Question 4

If a mutation occurs in a somatic cell, what is the most likely consequence?

Accepted Answer

It may affect tissue function or cause cancer, but will not be inherited

Question 5

Which checkpoint in the cell cycle ensures that DNA has been properly replicated before mitosis begins?

Accepted Answer

$$G_2$$ checkpoint

Question 6

What is the result of meiosis in terms of chromosome number and genetic diversity?

Accepted Answer

Four haploid cells, genetically unique

Question 7

Which process during meiosis increases genetic variation among gametes?

Accepted Answer

Crossing over during prophase I

Question 8

A cell with 46 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

46

Question 9

Which of the following best describes the role of ribozymes in mRNA processing?

Accepted Answer

They edit out introns from the primary RNA transcript

Question 10

What is the significance of the start codon AUG in the genetic code?

Accepted Answer

It codes for methionine and initiates translation

Question 11

Which of the following is true regarding differentiation in early embryonic development?

Accepted Answer

Differentiation begins after the 8-cell stage due to environmental differences

Question 12

What is the primary difference between mitosis and meiosis?

Accepted Answer

Mitosis produces genetically identical cells, meiosis produces genetically diverse cells

Question 13

Which environmental factor is most likely to cause genetic damage during fetal development?

Accepted Answer

Radiation exposure

Question 14

In somatic cell nuclear transfer cloning, what is the source of the genetic material for the clone?

Accepted Answer

The nucleus of a somatic cell from the adult organism

Question 15

Which of the following best explains why humans can produce more proteins than the number of genes in the genome?

Accepted Answer

Alternate splicing and alternate reading frames allow multiple proteins from one gene

Question 16

What is the role of tRNA during translation?

Accepted Answer

It brings specific amino acids to the ribosome and matches them to codons in mRNA

Question 17

Which process is most active between DNA replication and the beginning of mitosis to maintain genetic integrity?

Accepted Answer

DNA repair by specific enzymes

Question 18

A patient is exposed to a mutagen that causes errors in DNA repair enzymes. What is the most likely long-term consequence?

Accepted Answer

Increased risk of cancer due to accumulation of mutations

Question 19

Which of the following is a plausible concern when releasing only one pair of rabbits on a newly terraformed planet?

Accepted Answer

Increased risk of recessive mutations due to inbreeding

Question 20

Which formula correctly represents the restoration of diploid chromosome number after fertilization?

Accepted Answer

$$n + n = 2n$$

Cell Reproduction and Differentiation: The Cell Cycle, Chromosomes, and Genetic Mechanisms

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