Questions and Answers - Page 388 of 433

When cells enter mitosis, their existing array of cytoplasmic microtubules has to be rapidly broken down and replaced with the mitotic spindle that forms to pull the chromosomes into the daughter cells. The protein katanin is activated during the onset of mitosis, and chops microtubules into shorter pieces. What do you suppose is the fate of the microtubule fragments created by katanin? Explain your answer.

When cells enter mitosis, their existing array of cytoplasmic microtubules has to be rapidly broken down and replaced with the mitotic spindle that forms to pull the chromosomes into the daughter cells. The protein katanin is activated during the onset of mitosis, and chops microtubules into shorter pieces. What do you suppose is the fate … Read more

Which of the statement is false concerning mitosis and meiosis? a) Both of these processes require DNA synthesis beforehand. b) Both of these processes allow genetic variation.

Which of the statements is false concerning mitosis and meiosis? a) Both of these processes require DNA synthesis beforehand. b) Both of these processes allow genetic variation.

Place the following events in the order in which they occur during the cell cycle by numbering them from 1. In addition, indicate whether each process occurs during G1,S,G2 prophase, prometaphase, metaphase, anaphase, telophase, or cytokinesis. For the purposes of this question, assume the cell cycle starts with the beginning of interphase. ___ Spindle poles separate and move toward cell periphery _ Cell growth (after DNA replication) _ Nuclear envelope breakdown _ Cleavage furrow formation _ Sister chromatids move towards spindle poles _ Alignment of chromosome along cell equator _ Interpolar microtubule interactions begin _ Complete chromosome decondensation _ Nuclear lamin dephosphorylation _ DNA replication _ Kinetochore microtubule attachment to chromosomes _ Sister chromatid condensation _ Beginning of contractile ring assembly _ Nuclear envelope reassembly _ Centrosome duplication _ Suspension of cell cycle until all chromosomes attach to mitotic spindle _ Astral microtubule nucleation _ Sister chromatid separation ___ Complete separation of one cell into two new daughter cells

Place the following events in the order in which they occur during the cell cycle by numbering them from 1. In addition, indicate whether each process occurs during G1, S, G2, prophase, prometaphase, metaphase, anaphase, telophase, or cytokinesis.

Archives: Questions and Answers

Which of the statement is false concerning mitosis and meiosis? a) Both of these processes require DNA synthesis beforehand. b) Both of these processes allow genetic variation.

Exit from mitosis depends upon the degradation of: a. cohesion. b. condensin. c. cyclin B. d. securin. e. separase.

Describe the events a cell goes through during interphase (G1, S, G2).

Hereditary changes in groups of living organisms over time.

Living things that affect the interspecies relationships in an ecosystem are known as

Non-living chemical and physical factors that affect the interspecies relationships in the environment are known as

All the organisms of the same species living in a particular ecosystem belong to a

This includes a population, a biome, an ecosystem, and a community