Question

part a: multiple choice (1 point each)
circle the correct answer.

1. the main purpose of mitosis is to:

a) produce gametes b) repair and replace damaged cells c) convert dna into rna d) produce energy

1. during which phase of the cell cycle does dna replication occur?

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

1. which of the following is not a stage of mitosis?

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

1. during metaphase, chromosomes:

a) condense and become visible b) line up at the cells equator
c) separate into sister chromatids d) form two new nuclei

1. the structure that separates sister chromatids during mitosis is the:

a) centriole b) spindle fiber c) nuclear envelope d) cell membrane

1. cytokinesis is the process that:

a) divides the cytoplasm b) replicates dna
c) packages chromosomes d) forms spindle fibers

1. which of the following statements about the cell cycle is correct?

a) g1, s, and g2 make up interphase b) interphase is part of mitosis
c) cytokinesis occurs before mitosis d) dna is replicated during mitosis

Explanation:

1. Mitosis is for cell growth, repair, and asexual reproduction. Gametes are from meiosis (a wrong). DNA to RNA is transcription (c wrong). Energy production is not mitosis (d wrong).
2. DNA replication occurs in S - phase. G1 is growth (a wrong). G2 is pre - mitosis (c wrong). M is mitosis (d wrong).
3. Interphase is not a mitosis stage. Prophase, metaphase, anaphase are mitosis stages.
4. In metaphase, chromosomes line up at the equator. Condensation is prophase (a wrong). Separation is anaphase (c wrong). New nuclei are telophase (d wrong).
5. Spindle fibers separate sister chromatids. Centrioles organize spindle (a wrong). Nuclear envelope breaks down (c wrong). Cell membrane is not for this (d wrong).
6. Cytokinesis divides cytoplasm. DNA replication is S - phase (b wrong). Packaging is prophase (c wrong). Spindle fibers form in prophase (d wrong).
7. G1, S, G2 are interphase. Interphase is not part of mitosis (b wrong). Cytokinesis is after mitosis (c wrong). DNA replicates in S (d wrong).

Answer:

1. B. Repair and replace damaged cells
2. B. S
3. C. Interphase
4. B. Line up at the cell's equator
5. B. Spindle fiber
6. A. Divides the cytoplasm
7. A. G1, S, and G2 make up interphase