Rio Salado BIO 156 Exam 2| Questions And Answers!!
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Rio Salado BIO 156
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Rio Salado BIO 156
Cell Cycle - ANSWER 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? - ANSWER G1, G0, S, G2
What happens in interval G1? - ANSWER this is when the cell increases in size...
Rio Salado BIO 156 Exam 2| Questions And Answers !!
Cell Cycle - ANSWER 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? - ANSWER G1, G0, S, G2
What happens in interval G1? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER the cell produces proteins and other components that are necessary for division.
Where does a cell go after interval G2 of interphase? - ANSWER mitosis
What do the built-in checkpoints do in interphase? - ANSWER they stop the cycle from proceeding until certain conditions are met.
What divides first, the nucleus or the cytoplasm? - ANSWER Nucleus, then cytoplasm.
What happens in mitosis? - ANSWER the nucleus divides.
What is cytokinesis? - ANSWER division of the cytoplasm
What is a centromere? - ANSWER The centromere holds the sister chromatids together
(made of protein)
What is the first stage of mitosis and what happens there? - ANSWER 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? - ANSWER microtubule organizing center. they contain two centrioles.
What is the second stage of mitosis and what happens there? - ANSWER Metaphase. The chromosomes line up in the middle of the cell. Think meta - meet in middle. The centrosomes are still on opposite sides of the cell.
What is the third stage of mitosis and what happens there? - ANSWER Anaphase. This is where the centrosomes reach out with their microtubules and take one of each sister chromatid. There are now 4 chromosomes total. Think ana noooo
What do microtubules do? - ANSWER they are connected to the centrosomes and reach out to collect one of each chromatid.
What is the last stage of mitosis and what happens there? - ANSWER Telophase. Now that the chromosomes are all on opposite sides of the cell, they loosen up. Nuclear envelopes form around each cluster of chromosomes and mitosis ends.
Chromosomes contain what? - ANSWER DNA and proteins
What are homologous chromosomes? - ANSWER In a nucleus, chromosomes with the same shape, length, and genes
What is the largest chromosome in humans, how many copies do we each have, and what are they considered? - ANSWER Chromosome 1. We have 2. They are homologous chromosomes.
What is the beginning cell called in both mitosis and meiosis? - ANSWER the parent cell
What are the cells formed by the parent cell in both mitosis and meiosis called? - ANSWER the daughter cells
How do multicellular organisms grow and repair themselves? - ANSWER mitosis
What phase is a cell in for the majority of its life? - ANSWER Interphase
What happens after telophase? - ANSWER Cytokinesis, which is the division of the cytoplasm
The phase of mitosis where the nuclear envelope fragments disappear is called what? - ANSWER Prophase
What is the spindle? - ANSWER a fanlike microtubule structure that helps separate the chromosomes
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