AP Biology: Cell Cycle, Mitosis, Meiosis and Control – Flashcards
Unlock all answers in this set
Unlock answersquestion
Tetrads of chromosomes are aligned at the center of the cell: independent assoratment soon follows.
answer
Metaphase I
question
Synapsis of homologous pairs occurs; crossing over may occur
answer
Prophase I
question
A human cell in prophase of mitosis can be distinguished from a human cell in prophase I of meiosis by the
answer
paired homologous chromosomes in the meiotic cell
question
Which of the following is true concerning cancer cells
answer
they do not exhibit density-dependent inhibition when growing in culture, when they stop dividingm they do so at random points in the cell cycle, they are not subject to cell cycle controlls.
question
Taxol affects
answer
the fibers of the mitotic spindle
question
Nuclear division in which of the chromosome number is reduced from 2n to n is part of the life cycle of all if the following except
answer
bacteria
question
Mitosis in flowering plants is similar to mitosis in animals in that both
answer
centromeres uncouple and chromosomes move apart
question
What is the name for the special region on a duplicated chromosome that holds the sister chromatids together
answer
centromere
question
How do the two members of a pair of homologous chromosomes differ from each other?
answer
the precise sequence of the DNA within each of the chromosomes
question
Cytokinesis usually follows mitosis. If a cell completed mitosis but not cytokinesis, the result would be a cell with
answer
two nuclei
question
if 2n=48 for a particular cell, then the chromosome number in each cell after meiosis would be
answer
24
question
In which cell cycle stage would the nucleus have 6 picograms of DNA.
answer
G2
question
Which of the following are true about CDK
answer
CDK is present throughout the cell, and is an enzyme that attaches phospate groups to other proteins
question
Which if the followinf occurs in mitosis but not during meiosis I
answer
the Chromatids of each chromosome are seperated
question
all of the following are true statements about meiosis in mammals EXCEPT
answer
it produces four geneticall identical gametes
question
What triggers the cell's passage past the G2 checkpoint into mitosis
answer
MPF
question
A general term for enzymes that activate or inactivate other proteins by phosphorylating them
answer
protein kinase
question
A protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex
answer
cyclin
question
A protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active
answer
CDK
question
Which do ALL sexual life cycles have in common
answer
meiosis, fertilization and gametes
question
What takes place in both mitosis and meiosis
answer
separation of sister chromatids
