Chapter 8: Chromosomes and Cell Division

Question 1

Once all of the chromosomes are aligned at the metaphase plate, the chromatids can be separated in the next phase, which is:

1. interphase.
2. postmetaphase.
3. prophase.
4. anaphase.
5. telophase.

Answer 1

anaphase

Question 2

During which of the following parts of the cell cycle (including mitosis) will chromosomes contain sister chromatids?

1. anaphase
2. telophase
3. G1
4. G2

Answer 2

Gap 2 Phase (GP2)

Question 3

In which phase of the cell cycle are sister chromatids produced?

1. metaphase
2. G1
3. S
4. G2

Answer 3

Synthesis Phase (S phase)

Question 4

If a double-stranded, helical DNA molecule is analogous to a twisted rope ladder with handrails and rungs, then the rungs are representative of

1. phosphate groups.
2. sugar (deoxyribose) molecules.
3. nitrogenous bases.
4. covalent bonds.

Answer 4

nitrogenous bases

Question 5

During which part of mitosis does the nuclear envelope break down?

1. anaphase
2. metaphase
3. prophase
4. telophase

Answer 5

prophase

Question 6

Which of the following illustrates a pair of homologous chromosomes?

a. 1 and 3 only
b. 4 only
c. 1, 2, 3 and 4
d. 1, 3 and 4 only

Answer 6

1, 3 and 4 only

Question 7

Crossing over takes place during:

1. meiosis.
2. cytokinesis.
3. mitosis and meiosis.
4. mitosis.
5. None of the above is correct.

Answer 7

meiosis

Question 8

The majority of a eukaryotic cell’s life is spent in an “in-between-division” stage referred to as:

1. S phase.
2. dormant phase.
3. interphase.
4. innerphase.
5. static phase.

Answer 8

interphase

Question 9

The number of chromosome pairs in a species:

1. is greatest among insects.
2. is always 23.
3. is greatest among amphibians.
4. is always greater than 3.
5. Is it’s diploid (2n) number.

Answer 9

Is it’s diploid (2n) number

Question 10

Whether it is eggs or sperm being produced through meiosis, under normal circumstances, each gamete ends up with:

1. equal amounts of cytoplasm.
2. the same alleles.
3. exactly one copy of each chromosome.
4. exactly two copies of each chromosome.
5. the same number of spindle fibers.

Answer 10

exactly one copy of each chromosome

Question 11

Different versions of the same gene are called

1. alleles.
2. diploids.
3. homologous chromosomes.
4. sister chromatids.

Answer 11

alleles

Question 12

Within interphase, which of the stages is defined by the active replication of the cell’s genetic material?

1. the Gap 2 phase
2. the mitotic phase
3. the Gap 1 phase
4. the replitosis phase
5. the DNA synthesis phase

Answer 12

the DNA synthesis phase

Question 13

In some species, sex is determined by environmental, rather than genetic, factors. This is true of:

1. birds.
2. humans.
3. turtles.
4. bees.
5. dogs.

Answer 13

turtles

Question 14

Which of the following DOES occur during anaphase I of meiosis?

1. The homologous pairs align at the metaphase plate.
2. Microtubules attach to the kinetochores of the homologous chromosomes.
3. The homologous pairs move toward the metaphase plate.
4. The centrosomes move to each pole.
5. The homologous chromosomes, made of replicated chromatids, move toward the poles.

Answer 14

The homologous chromosomes, made of replicated chromatids, move toward the poles

Question 15

Which of the following does NOT occur during prophase I of meiosis?

1. Chromosomes begin to condense.
2. Crossing over between tetrads.
3. Nuclear membrane disintegrates.
4. Spindle microtubules form.
5. Homologous pairs of chromosomes align at the metaphase plate.

Answer 15

Homologous pairs of chromosomes align at the metaphase plate

Question 16

A male porcupine’s liver cells each has 34 chromosomes. How many chromosomes are in each of his sperm cells?

1. 17
2. 51
3. 34
4. 68

Answer 16

17

Question 17

Which carbohydrate is used to create the cell wall during cytokinesis in plant cells?

1. cellulose
2. sucrose
3. glucose
4. lactose

Answer 17

cellulose

Question 18

What is the function of DNA polymerase during DNA replication?

1. It attaches neighboring nucleotides within a nucleic acid strand.
2. It unzips the two halves of the DNA double helix.
3. It creates the hydrogen bonds between the bases.
4. It checks for and repairs replication errors.

Answer 18

It attaches neighboring nucleotides within a nucleic acid strand

Question 19

A karyotype of one of your skin cells would reveal a total of 46 chromosomes. How many of these are maternally inherited chromosomes?

1. 20
2. 24
3. 23
4. 22
5. 46

Answer 19

23

Question 20

During which phase of mitosis do sister chromatids separate to opposite poles of the cell?

1. prophase
2. anaphase
3. metaphase
4. telophase

Answer 20

anaphase