Cell Cycle Bio 1330

Nucleoli are present during _____.interphase
Cytokinesis often, but not always, accompanies _____.telophase
Chromosomes become visible during _____.Prophase
Centromeres divide and sister chromatids become full-fledged chromosomes during _____.anaphase
During anaphase, sister chromatids separate and daughter chromosomes migrate to opposite poles.anaphase
During prophase a homologous pair of chromosomes consists of _____.two chromosomes and four chromatids
Which of these phases encompasses all of the stages of mitosis?mitosis
During _____ both the contents of the nucleus and the cytoplasm are divided.mitotic phase
During _____ the cell grows and replicates both its organelles and its chromosomes.interphase
Which event does not take place before the start of mitosis?The nuclear envelope disintegrates
True or false? Mitosis takes place during M phase, which is the longest phase of the cell cycle.False
Which term describes two recently replicated DNA strands that are joined together just before cell division?Sister chromatids
During which stage of mitosis are chromosomes lined up in the center of the cell?Metaphase
During which substage of mitosis do sister chromatids break apart and start moving to opposite poles of the cell?Anaphase
To which part of the centromere do mitotic spindle fibers attach during prometaphase?Kinetochore
Which stage of mitosis is characterized by the disintegration of mitotic spindles and the formation of two new nuclear membranes?Telophase
UV light
testosterone
cigarette smoke
fat
all of the above are carcinogens
_____ is a carcinogen that promotes colon cancer.fat
Mitotic spindle fibers are composed of what cellular components?Microtubules
The G1 checkpoint of mitosis will be passed if _____________________.cell size is adequate
How does a nucleus in G2 differ from a nucleus in G1?The G2 nucleus has double the amount of DNA as the G1 nucleus
Many cancers are due to the failure of cells to properly regulate the ________ checkpoint during the cell cycle.G1 — cells that have passed the G1 checkpoint are committed to replicating their DNA and dividing
The consequence of E2F inactivation is that __________.cells are unable to enter the S phase
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?24
Which of the following conditions will most likely prevent a cell from passing the G1 checkpoint?DNA is damaged
What role(s) do gap phases play in the cell cycle?They allow cells to replicate organelles and manufacture additional cytoplasm.
Which statement is correct concerning the relationship between chromosomes and either genes, chromatin, or sister chromatids?Each replicated chromosome consists of two sister chromatids.
The product of the p53 gene _____.inhibits the cell cycle
Tumor suppressor genes ________.encode proteins that help prevent uncontrolled cell growth