Cell Cycle Bio 1330

question

Nucleoli are present during _____.
answer

interphase
question

Cytokinesis often, but not always, accompanies _____.
answer

telophase
question

Chromosomes become visible during _____.
answer

Prophase
question

Centromeres divide and sister chromatids become full-fledged chromosomes during _____.
answer

anaphase
question

During anaphase, sister chromatids separate and daughter chromosomes migrate to opposite poles.
answer

anaphase
question

During prophase a homologous pair of chromosomes consists of _____.
answer

two chromosomes and four chromatids
question

Which of these phases encompasses all of the stages of mitosis?
answer

mitosis
question

During _____ both the contents of the nucleus and the cytoplasm are divided.
answer

mitotic phase
question

During _____ the cell grows and replicates both its organelles and its chromosomes.
answer

interphase
question

Which event does not take place before the start of mitosis?
answer

The nuclear envelope disintegrates
question

True or false? Mitosis takes place during M phase, which is the longest phase of the cell cycle.
answer

False
question

Which term describes two recently replicated DNA strands that are joined together just before cell division?
answer

Sister chromatids
question

During which stage of mitosis are chromosomes lined up in the center of the cell?
answer

Metaphase
question

During which substage of mitosis do sister chromatids break apart and start moving to opposite poles of the cell?
answer

Anaphase
question

To which part of the centromere do mitotic spindle fibers attach during prometaphase?
answer

Kinetochore
question

Which stage of mitosis is characterized by the disintegration of mitotic spindles and the formation of two new nuclear membranes?
answer

Telophase
question

UV light testosterone cigarette smoke fat
answer

all of the above are carcinogens
question

_____ is a carcinogen that promotes colon cancer.
answer

fat
question

Mitotic spindle fibers are composed of what cellular components?
answer

Microtubules
question

The G1 checkpoint of mitosis will be passed if _____________________.
answer

cell size is adequate
question

How does a nucleus in G2 differ from a nucleus in G1?
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The G2 nucleus has double the amount of DNA as the G1 nucleus
question

Many cancers are due to the failure of cells to properly regulate the ________ checkpoint during the cell cycle.
answer

G1 — cells that have passed the G1 checkpoint are committed to replicating their DNA and dividing
question

The consequence of E2F inactivation is that __________.
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cells are unable to enter the S phase
question

A certain species of animal has six pairs of chromosomes. How many sister chromatids do the nuclei of this animal’s cells have during the G2 phase?
answer

24
question

Which of the following conditions will most likely prevent a cell from passing the G1 checkpoint?
answer

DNA is damaged
question

What role(s) do gap phases play in the cell cycle?
answer

They allow cells to replicate organelles and manufacture additional cytoplasm.
question

Which statement is correct concerning the relationship between chromosomes and either genes, chromatin, or sister chromatids?
answer

Each replicated chromosome consists of two sister chromatids.
question

The product of the p53 gene _____.
answer

inhibits the cell cycle
question

Tumor suppressor genes ________.
answer

encode proteins that help prevent uncontrolled cell growth

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