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Cellular & Sexual Reproduction (I)
Test Description: Combination of mitosis & meiosis from ch. 9 & 10
Instructions: Answer all questions to get your test result.
1) By the end of prophase, each of the following has occured except ___________.
A
disappearing of the nucleolus
B
breaking down of the nuclear envelope
C
tighter coiling of the chromosomes
D
lining up of chromosomes in the cell
2) Which of the following does not occur as a cell grows larger and larger?
A
difficulty eliminating wastes
B
difficulty obtaining nutrients
C
diffusion across the cell membrane is impaired
D
ratio of surface area to volume increases
3) Why is the synthesis stage called this?
A
because the chromosomes come together
B
because it combines several smaller stages into one
C
because protein synthesis is taking place
D
because DNA synthesis is taking place
4) A cell has 12 chromosomes. How many chromosomes will each daughter cell have?
A
4
B
12
C
24
D
6
5) The cell cycle is regulated by __________.
A
hormones
B
cyclins
C
enzymes
D
sugars
6) Cancer cells can reproduce rapidly because they
A
undergo mitosis faster.
B
are smaller than normal cells.
C
bypass interphase.
D
spend less time in interphase.
7) What is cancer caused by?
A
mutation
B
cell-membrane damage
C
metabolic poisoning
D
immune-system damage
8) Prokaryotes divide by binary fission, a form of asexual reproduction in which
A
a cell divides into two cells with identical genetic information.
B
the nucleus divides into two nuclei.
C
spindle fibers attach to the poles of the cell.
D
the number of chromosomes in the cell is reduced.
9) It is often said that normal cells change into cancerous cells frequently in our bodies. Which of the following explanations accounts for the relative rarity of cancer?
A
The cancerous cells die on their own.
B
The DNA repair system fixes the mutation that causes cancer.
C
The cancerous cells are normally crowded out by normal cell growth.
D
The cancer cells grow only very slowly at first.
10) What is the role of cyclin-dependent kinases in the cell cycle?
A
They catalyze the condensation of the chromosomes.
B
They initiate various stages of the cell cycle.
C
They stop the cycle if something has gone wrong.
D
They provide the energy for the actions of the spindle fibers.
*select an answer for all questions
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