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MAstering Biology Exam 3 with correct Answers
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MAstering Biology Exam 3 with correct Answers
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MAstering Biology Exam 3 with correctAnswers
During _____ both the contents of the nucleus and the cytoplasm are divided. - Answer
-the mitotic phase
During _____ the cell grows and replicates both its organelles and its chromosomes. -
Answer -interphase
Which of the following is a function of the S phase in the cell cycle? - Answer -The
synthesis of sister chromatids
The copying of chromosomes occurs during which of the following phases of the cell
cycle? - Answer -S phase
For the first several divisions of early frog embryos, cells proceed directly from the M
phase to the S phase and back to M without gaps. Which of the following is likely to be
true about dividing cells in early frog embryos? - Answer -The cells get smaller with
each generation.Without gap phases, the cells have no opportunity to grow.
True or false? The M phase is characterized by the replication and division of a cell's
chromosomes. - Answer -False
Cells replicate their chromosomes during the S phase and divide partition their
chromosomes during the M phase.
If an organism normally has 34 chromosomes, how many molecules of DNA should
there be in the G1 phase of the cell cycle? - Answer -34 There is one DNA molecule per
chromosome.
Which of the following events would cause the cell cycle to arrest? - Answer -Poor
nutrient conditions. Poor nutrient conditions would arrest the cell cycle at the G1
checkpoint.
DNA replication produces two identical DNA molecules called _____ which seperate
during mitosis - Answer -sister chromatids
After Chromosomes Condense the____ is the region where the identical DNA
molecules are most tightly attached to each other - Answer -Centromeres
, during mitosis microtubules attach to chromosomes at teh - Answer -kinetochores
in dividing cellsmost of the cells growth phase occurs during - Answer -interphase
the ______ ia a cell structure consisting of microtubules, which forms during early
mitosis and plays a role in cell division - Answer -mitotic spindles
during interphase most of the nuclus is filled with a complex of DNA and protien in a
dispersedform called ____ - Answer -Chromatin
In Most eukaryotes division of the nucleous is followed by ____when the rest of the cell
divides - Answer -cytokinesis
the ______ are the organizing center for micro tubules involved in separating
chromosomes during mitosis. - Answer -centrosomes
Many organisms contain cells that do not normally divide. These cells exit the cell cycle
before the - Answer -G1 checkpoint
Once a cell passes the G1 checkpoint - Answer -it usually completes the cell cycle--that
is, it divides.
The first step in preparing for division - Answer -is to replicate the cell's DNA in the S
phase.
In the G2 phase - Answer -the centrosome replicates
In early M phase - Answer -the centrosomes move away from each other toward the
poles of the cell, in the process organizing the formation of the mitotic spindle.
At the end of the M phase when mitosis is complete... - Answer -the cell divides
(cytokinesis), forming two genetically identical daughter cells
Are sister chromatids present in all or part of this phase - Answer -S G2 Begining of M
propase early anaphase
Is the DNA condensed in allor part of this phase - Answer -end of M late anaphase
telophase Begining of M propase early anaphase
Does the cell contain X2 the amount of DNA in this phase as it did in the G1 Phase -
Answer -S g2 end of M late anaphase telophase Begining of M propase early anaphase
In prophase, - Answer -the microtubules of the spindle apparatus begin to assemble
from individual tubulin subunits. As the identical chromatids of each pair of sister
chromatids condense during this stage, they are held together by cohesin proteins.
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