8. Which is NOT TRUE of the S phase? A. DNA undergoes semiconservative replication. B. Identical sister chromatids are formed from duplication of each chromosome. C. Sister chromatids of each chromosome remain joined to each other at their centromeres. D. A human cell after the S phase has now 4n = 92 chromosomes.
Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
8. Which is NOT TRUE of the S phase?
A. DNA undergoes semiconservative replication.
B. Identical sister chromatids are formed from duplication of each chromosome.
C. Sister chromatids of each chromosome remain joined to each other at their centromeres.
D. A human cell after the S phase has now 4n = 92 chromosomes.
9. Which is NOT TRUE of G2?
A. It usually lasts about 3 hours.
B. It is the interval between chromosome duplication and beginning of mitosis.
C. It is during this stage the cell achieves most of its growth.
D. A human cell during G2 has 92 chromatids.
10. The following are cellular events during prophase, EXCEPT:
A. There is gradual condensation of chromosomes from the undifferentiated mass of chromatin.
B. Darkly staining nucleoli begin to break down and disappear.
C. Centrosomes move apart toward opposite poles and generate new microtubules.
D. The nuclear membrane is broken down.
11. The following are cellular events during prometaphase, EXCEPT:
A. The breaking down of the nuclear membrane allows microtubules to invade the nucleus.
B. Sister chromatids attach to microtubules from opposite centrosomes through centromeres.
C. Polar microtubules are directed toward the middle of the cell.
D. Astral microtubules extend out from the centrosome toward the cell’s periphery.
12. Which is NOT TRUE of metaphase?
A. Chromosomes align on the metaphase plate.
B. The sister chromatids are facing opposite poles.
C. Sister chromatids are pulled in opposite directions while they are still connected to each other by the tight cohesion of their centromeres.
D. A human cell during G2 has 4n = 92 chromosomes.
13. Which is NOT TRUE of anaphase?
A. The centromeric connections between sister chromatids are severed.
B. All chromosomes have a characteristic V shape during anaphase.
C. As the chromosome moves toward the pole, its kinetochore microtubules shorten.
D. A human nucleus during anaphase has 4n = 92 chromosomes.
14. Which is NOT TRUE of telophase?
A. A nuclear envelope forms around the group of chromosomes at each pole.
B. Chromosomes uncoil and become a tangle of chromatin.
C. The spindle fiber begins to disperse.
D. Two separate daughter cells are formed.
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