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Rio Salado BIO 156 Exam 2 Questions and Answers
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Rio Salado BIO 156 Exam 2 Questions and Answers
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Rio Salado BIO 156 Exam 2 Questionsand Answers
Cell Cycle
the collective series of intervals and events of a cells life, from the time it forms
until it divides.
What are the 4 intervals of interphase in the order they take place?
G1, G0, S, G2
What happens in interval G1?
this is when the cell increases in size and produces molecules required for DNA
replication
From which interval would a cell possibly go into interval G0 and how long would
it stay there? What would it do there?
if a cell decided to go to G0 it would be after interval G1. Here it would just go
about its metabolic business and not prepare to divide. It would stay there
temporarily or permanently. If it decided to leave, it would go back to G1 and
then progress on to interval S.
What happens in interval S?
, a cell copies it's chromosomes by DNA replication. After this happens each
chromosome consists of two molecules of DNA and they are attached as sister
chromatids.
What happens in interval G2?
the cell produces proteins and other components that are necessary for division.
Where does a cell go after interval G2 of interphase?
mitosis
What do the built-in checkpoints do in interphase?
they stop the cycle from proceeding until certain conditions are met.
What divides first, the nucleus or the cytoplasm?
Nucleus, then cytoplasm.
What happens in mitosis?
the nucleus divides.
What is cytokinesis?
division of the cytoplasm
What is a centromere?
The centromere holds the sister chromatids together (made of protein)
What is the first stage of mitosis and what happens there?
Prophase. The nuclear envelope breaks up, the centrosomes split up to opposite
sides of the cell, spindle microtubules assemble and bind to chromosomes at the
centromere. Think pro - pro at breaking up
What is a centrosome?
microtubule organizing center. they contain two centrioles.
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