chp 12 practice quiz

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a cell biologist carefully measured the quantity of dna in grasshopper cells growing in cell culture. cells examined during the g2 phase of the cell cycle contained 200 units of dna. what would the amount of dna at g1 of the cell cycle in one of the grasshopper daughter cells?

100

which of the following processes does not occur in dividing bacteria?

(mitosis) binary fission seperation of the origins of replication relpication of dna inward growth of the plasma membrane

following cytokinesis in an animal cell, how many centrioles does each new daughter cell possess

2

how many maternal chromosomes are present in a somatic human cell not engaged in cell division

23

assume that you are dealing with a species in which the number of chromosomes in each somatic cell is 14. how many chromatids are present in the early telophase of mitiosis?

28

if a cell contains 60 chromatids at the start of mitosis, how many chromosomes will be found in each daughter cell at the completion of the cell cycle?

30

if a somatic human cell is just about to divide it has how many chromatids?

92 chromatids

down syndrome is characterized by cells having 3 copies of chromosome 21. as a cell in an individual with down syndrome prepares to enter mitosis, how many chromatids would be present?

94 chromatids

a biochemist measured the amount of dna in cells growing in the laboratory and found that the quantity of dna in cells doubled

between g1 and g2 phases

during interphase the genetic material of a typical eukaryotic cell

dispersed in the nucleus as long strands of chromatin

which of the following is involved in the binary fission of bacteria

distribution of a copy of the single parental chromosome to each daughter cell

cytokinesis refers to

division of the cytoplasm

when a cell in s phase is fused with a cell in g1

dna synthesis begins immediately in the original g1 nucleus

observations of cancer cells in culture support the hypothesis that cancer cells

do not exhibit density-dependent inhibition

the function of the mitotic cell cycle is to produce daughter cells that are

genetically identical to the parent cell (assuming no mutation has occured)

tissue culture experiments with pdgf demonstrate that without this substance

cells fail to divide

what is the difference between a benign tumor and a malignant tumor

cells of benign tumors do not metastasize those of malignant tumors do

the region of a chromosome holding the two double strands of replicated dna together

centromere

these are indentical copies of each if they are part of the same chromosome

chromatids

the complex dna and protein that makes up a eukaryotic chromosome is called

chromatin

what does occur in mitosis?

condensation of chromatin (prophase) the movement of chromosomes to opposite poles (metaphase) seperation of chromatids (anaphase) alignment of chromosomes along the cells equator (metaphase)

in animal cell mitosis, the cleavage furrow forms during which stage of the cell cycle?

cytokinesis

what does not occur in mitosis?

replication of chromosomes occurs in the s phase of interphase

the centromere is a region in which

sister chromatids are attached to one another in prophase

the truth about sister chromatids

sister chromatids are created when dna is replicated sister chromatids form in the s-phase stage of the cell cycle sister chromatids are attached to one another at the centromere sister chromatids are separated during mitosis

which of following phases of mitosis is essentially the opposite of prometaphase in terms of the nuclear envelope

telophase

during binary fission in a bacterium

the origins of replication move apart

dna replication occurs in

the s phase of interphase in both somatic and reproductive cells

what events occur in anaphase

a spindle made of microtubules is present the centrioles are opposite poles identical chromatids move to opposite poles the centromeres divide

during what stage of the cell cycle do sister chromatids separate?

anaphase

the phase of mitosis during which the chromosomes move towards separate poles of the cell is

anaphase

during what phase in the cell cycle would you find the most dna per cell?

end of s

you would know a dividing cell was a plant cell rather than an animal cell by what

if you saw that it had formed a cell plate

at which stage of mitosis are chromosomes lined up in one plane in preparation for their separation to opposite poles of the cell?

metaphase

you would be unlikely to see which of the following human cells dividing?

nerve cell

the nuclear envelope disappears in what phase

prometaphase

in a human skin that is going through the cell cycle, when do the centrosomes seperate?

prophase

in telophase of mitosis spindle breaks down and the chromatin uncoils. this essentially the opposite of what happens in

prophase

the beginning of the formation of the spindle apparatus occurs in

prophase


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