Question 1

Which of the following best describes the structure of a nucleotide in DNA?

Accepted Answer

A phosphate group, a pentose sugar (deoxyribose), and a nitrogenous base

Question 2

What type of bond connects the sugar and phosphate groups in the backbone of a DNA molecule?

Accepted Answer

Phosphodiester bond

Question 3

Which of the following base pairs is held together by three hydrogen bonds in DNA?

Accepted Answer

Guanine–Cytosine

Question 4

If a double-stranded DNA molecule contains 30% adenine, what percentage of guanine does it contain?

Accepted Answer

$$20\%$$

Question 5

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar

Question 6

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 7

What is the function of histone proteins in eukaryotic cells?

Accepted Answer

They help package DNA into nucleosomes

Question 8

Which of the following best describes the difference between homologous chromosomes and sister chromatids?

Accepted Answer

Homologous chromosomes are similar chromosomes from each parent, while sister chromatids are identical copies formed during DNA replication

Question 9

Which checkpoint in the cell cycle ensures that the cell's DNA is undamaged and fully replicated before mitosis begins?

Accepted Answer

G2 checkpoint

Question 10

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

Accepted Answer

$$46$$

Question 11

Which of the following events occurs during prophase of mitosis?

Accepted Answer

Nuclear envelope disintegrates and spindle fibers begin to form

Question 12

In which type of cell division do homologous chromosomes pair up and exchange genetic material through crossing-over?

Accepted Answer

Meiosis I

Question 13

Which of the following is a key difference between cytokinesis in plant and animal cells?

Accepted Answer

Animal cells form a cleavage furrow, while plant cells form a cell plate

Question 14

Which process is responsible for the rapid population growth of bacteria?

Accepted Answer

Binary fission

Question 15

A diploid cell (2n) undergoes meiosis. What is the chromosome number in each resulting gamete?

Accepted Answer

$$n$$

Question 16

Which of the following best explains why sexual reproduction leads to genetic variation?

Accepted Answer

It involves crossing-over and independent assortment during meiosis

Question 17

Which of the following statements about polyploidy is correct?

Accepted Answer

Polyploid plants are often larger and more robust than diploid plants

Question 18

During which stage of meiosis do sister chromatids separate and move to opposite poles?

Accepted Answer

Anaphase II

Question 19

In the life cycle of plants, what is the function of the gametophyte generation?

Accepted Answer

To produce haploid gametes by mitosis

Question 20

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

Accepted Answer

It attaches spindle fibers to the centromere of each chromosome

Chromosomes, Mitosis, and Meiosis: Structure and Function of Genetic Material

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