Question

1. if a cell has 12 chromosomes before mitosis, how many will each daughter cell have after mitosis?

a) 6 b) 12 c) 18 d) 24

1. which checkpoint ensures all chromosomes are attached before anaphase?

a) g1 b) g2 c) m d) s

1. what happens to the nuclear envelope during prophase?

a) it dissolves b) it thickens c) it duplicates d) it moves to the equator

1. during which phase do sister chromatids move toward opposite poles?

a) prophase b) metaphase c) anaphase d) telophase

1. what is the role of centrioles in animal cells?

a) replicate dna b) organize spindle fibers c) produce ribosomes d) break down the nucleus

1. during which phase of mitosis do chromosomes uncoil and the nuclear envelope reforms?

a) telophase b) anaphase c) prophase d) metaphase

1. which statement is true about spindle fibers?

a) they pull chromatids apart b) they form the cell plate c) they replicate dna d) they produce atp

1. cells that divide uncontrollably may form:

a) tissues b) tumors c) chromatids d) gametes

1. a cell in g0 phase is:

a) actively dividing b) resting or not dividing c) duplicating dna d) undergoing mitosis

1. which of the following occurs first in mitosis?

a) chromosomes line up b) nuclear envelope breaks down c) sister chromatids separate d) cytoplasm divides

1. homologous chromosomes:

a) are identical sister chromatids b) pair during meiosis, not mitosis c) pair during mitosis d) form after cytokinesis

1. which process ensures daughter cells receive identical chromosomes?

a) mitosis b) meiosis c) fertilization d) apoptosis

Explanation:

• Question 8: Mitosis produces daughter cells with the same number of chromosomes as the parent cell.
• Question 9: The M checkpoint (also known as the spindle - assembly checkpoint) ensures all chromosomes are attached to the spindle fibers before anaphase.
• Question 10: During prophase, the nuclear envelope dissolves.
• Question 11: In anaphase, sister chromatids are pulled apart and move toward opposite poles.
• Question 12: Centrioles in animal cells organize spindle fibers.
• Question 13: In telophase, chromosomes uncoil and the nuclear envelope reforms.
• Question 14: Spindle fibers pull chromatids apart.
• Question 15: Uncontrollably dividing cells can form tumors.
• Question 16: A cell in G0 phase is resting or not dividing.
• Question 17: In mitosis, the nuclear envelope breaks down first (prophase).
• Question 18: Homologous chromosomes pair during meiosis, not mitosis.
• Question 19: Mitosis ensures daughter cells receive identical chromosomes.

Answer:

1. b) 12
2. c) M
3. a) It dissolves
4. c) Anaphase
5. b) Organize spindle fibers
6. a) Telophase
7. a) They pull chromatids apart
8. b) Tumors
9. b) Resting or not dividing
10. b) Nuclear envelope breaks down
11. b) Pair during meiosis, not mitosis
12. a) Mitosis