Mitosis & meosis true/False



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MITOSIS & MEOSIS
True/False

Indicate whether the statement is true or false.
____ 1. Diffusion over large distances is slow and inefficient because it relies on random movement of molecules and ions.
____ 2. The cell cycle is divided into interphase and mitosis.
____ 3. During prophase in an onion root tip cell, centrioles migrate to the poles of the cell.
____ 4. In plant cells, cytokinesis begins with a furrow that pinches the cell.
____ 5. Stem cells are only of one type: embryonic.
____ 6. Embryonic stem cells are found in various tissues in the body and might be used to maintain and repair the same kind of tissue in which they are found.
____ 7. A gamete has one-half the number of chromosomes of a regular body cell.
____ 8. Homologous chromosomes are two chromosomes with identical DNA sequences.
____ 9. Recent research suggests that beneficial mutations accumulate faster when species undergo sexual reproduction rather than asexual reproduction.
____ 10. During meiosis, chromosome number is reduced through three rounds of cell division.
____ 11. Sexual reproduction would be more advantageous than asexual reproduction for organisms living in an environment that is diverse and undergoes frequent changes.
____ 12. Mendel’s work on garden pea plants resulted in the discovery that genetic traits of parents always blend together in subsequent generations.
____ 13. In humans, the ability to roll one’s tongue is a dominant trait. Therefore, a tongue roller can only have children who are also tongue rollers.
____ 14. The separation of genes during crossing over occurs more frequently between genes that are far apart on a chromosome than for genes that are close together.
____ 15. Polyploidy is more common in plants than animals.
____ 16. Polyploid plants such as coffee and strawberries are often less healthy and smaller than diploid plants of the same species.
____ 17. During meiosis I, homologus chromosome pairs are separated when the centromeres split apart.
____ 18. Meiosis occurs during both sexual reproduction and asexual reproduction.
____ 19. Gregor Mendel’s research supports the idea each organism carries a pair of alleles.
Multiple Choice

Identify the choice that best completes the statement or answers the question.
____ 20. By the end of prophase, each of the following has occurred except ____.

a.

tighter coiling of the chromosomes

b.

breaking down of the nuclear envelope

c.

disappearing of the nucleolus

d.

lining up of chromosomes in the cell

____ 21. The chromosomes shown in Figure 9-1 are in which state of mitosis?




Figure 9-1

a.

prophase

c.

anaphase

b.

metaphase

d.

telophase




Figure 9-2
____ 22. Which of the cells depicted in the line graph in Figure 9-2 are most likely cancerous?

a.

A

c.

C

b.

B

d.

D

____ 23. If cancer is present, what is the likely explanation for what happened to the cells depicted in the curves labeled B and D in Figure 9-2?



a.

They thrived with the cancerous cells.

b.

They were harmed by radiation therapy.

c.

They died off due to natural causes.

d.

They died off because the cancerous cells deprived them of nutrients.

____ 24. Which of the following does not occur as a cell grows larger and larger in size?



a.

difficulty obtaining nutrients

b.

difficulty eliminating wastes

c.

ratio of surface area to volume increases

d.

diffusion across the cell membrane is impaired




Figure 9-3
____ 25. Which of the graphs in Figure 9-3 shows the correct changes in the amount of DNA in a cell as it moves through one cell cycle?

a.

A

c.

C

b.

B

d.

D

____ 26. Why is the synthesis stage called this?



a.

because protein synthesis is taking place

b.

because DNA synthesis is taking place

c.

because it combines several smaller stages into one

d.

because the chromosomes come together

____ 27. Which of these has occurred by the end of prophase?



a.

Sister chromatids are separated.

b.

The spindle is beginning to form.

c.

The cell membrane has begun to pinch inward.

d.

The nuclear membrane has disappeared.





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