Question 1

Which cellular structure is responsible for the biochemical identity of animal cells and is under genetic control?

Accepted Answer

Glycocalyx

Question 2

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

Accepted Answer

S phase

Question 3

In prokaryotes such as E. coli, where is the genetic material located?

Accepted Answer

Nucleoid region

Question 4

Which organelle is primarily responsible for ATP synthesis during cellular respiration?

Accepted Answer

Mitochondria

Question 5

A diploid organism has $$2n = 16. $$How many chromatids are present at the end of mitotic prophase?

Accepted Answer

$$32$$

Question 6

Which protein complex holds sister chromatids together during mitosis and is degraded by separase?

Accepted Answer

Cohesin

Question 7

What is the function of the synaptonemal complex during meiosis I?

Accepted Answer

It mediates synapsis and recombination between homologous chromosomes.

Question 8

During which stage of meiosis I does crossing over occur between nonsister chromatids?

Accepted Answer

Diplonema

Question 9

If an organism has a diploid number of $$2n = 16$$, how many tetrads are present in prophase of meiosis I?

Accepted Answer

$$8$$

Question 10

Which checkpoint in the cell cycle monitors DNA damage and cell size before DNA synthesis?

Accepted Answer

G1/S checkpoint

Question 11

What is the main evolutionary significance of the endosymbiont hypothesis regarding mitochondria and chloroplasts?

Accepted Answer

They originated from primitive free-living organisms that established symbiotic relationships with eukaryotic cells.

Question 12

Which of the following best describes the difference between mitosis and meiosis in terms of chromosome number in daughter cells?

Accepted Answer

Mitosis produces diploid cells, meiosis produces haploid cells.

Question 13

During anaphase of mitosis in a cell with $$2n = 16$$, how many chromosomes move to each pole?

Accepted Answer

$$16$$

Question 14

Which stage of the cell cycle is highly variable in length and is important for cell proliferation and its control?

Accepted Answer

G1 phase

Question 15

What is the result of nondisjunction during meiosis I?

Accepted Answer

Homologous chromosomes fail to separate, leading to gametes with abnormal chromosome numbers.

Question 16

Which process increases genetic variation among gametes during meiosis?

Accepted Answer

Crossing over

Question 17

In oogenesis, what is the fate of the cell that receives most of the cytoplasm after meiosis I?

Accepted Answer

It becomes the secondary oocyte.

Question 18

Which of the following statements about the X and Y chromosomes is correct?

Accepted Answer

They have homologous regions and behave as homologs during meiosis.

Question 19

What is the role of cyclin-dependent kinases (CDKs) in the cell cycle?

Accepted Answer

They phosphorylate target proteins to regulate cell cycle progression.

Question 20

During telophase in plant cells, what structure forms to separate the two daughter cells?

Accepted Answer

Cell plate

Study Guide: Mitosis and Meiosis (Concepts of Genetics, Chapter 2)

Study Guide - Practice Questions