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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
tighter coiling of the chromosomes
B
disappearing of the nucleolus
C
breaking down of the nuclear envelope
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 obtaining nutrients
B
ratio of surface area to volume increases
C
difficulty eliminating wastes
D
diffusion across the cell membrane is impaired
3) Why is the synthesis stage called this?
A
because the chromosomes come together
B
because protein synthesis is taking place
C
because DNA synthesis is taking place
D
because it combines several smaller stages into one
4) A cell has 12 chromosomes. How many chromosomes will each daughter cell have?
A
4
B
12
C
6
D
24
5) The cell cycle is regulated by __________.
A
sugars
B
enzymes
C
hormones
D
cyclins
6) Cancer cells can reproduce rapidly because they
A
bypass interphase.
B
are smaller than normal cells.
C
undergo mitosis faster.
D
spend less time in interphase.
7) What is cancer caused by?
A
cell-membrane damage
B
mutation
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 number of chromosomes in the cell is reduced.
C
spindle fibers attach to the poles of the cell.
D
the nucleus divides into two nuclei.
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 cancer cells grow only very slowly at first.
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 cancerous cells die on their own.
10) What is the role of cyclin-dependent kinases in the cell cycle?
A
They provide the energy for the actions of the spindle fibers.
B
They stop the cycle if something has gone wrong.
C
They initiate various stages of the cell cycle.
D
They catalyze the condensation of the chromosomes.
*select an answer for all questions
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