1. Why do you think that cells duplicate their chromosomes before dividing inste

Question

1. Why do you think that cells duplicate their chromosomes before dividing instead of after? They'd end up with the same amount either way.
A. It's just a random result of evolution.
B. It's more efficient because the parent cell has more material to work with.
C. The daughter cells would each lose one-half of the genetic information otherwise.
D. The daughter cells have no way to duplicate the chromosomes.

2. The bacterium, E. coli, has about 3000 genes in its single chromosome. Assume that the genetic material does not duplicate during cell division. How many generations do you estimate would pass before only one gene would be left in the daughter cells?
A. 5
B. 12
C. 3000

3. In prokaryotes (simple, single-celled life), the genetic material is not contained within a separate organelle (nucleus). Prokaryotes also have no centrioles. They do not develop spindles to help separate the duplicated DNA. They have just one chromosome. How might such a cell duplicate so that the two copies of DNA appear in separate daughter cells?
A. Rely on random positions of the chromosomes.
B. Attach DNA to cell membrane and split between attachment points.
C. Chromosomes push off from each other during splitting.

4. Eukaryotes (cells with a nucleus) have other organelles like mitochondria (energy-producing organelles) and chloroplasts (in plants only) that contain DNA. Guess how their DNA would be passed on to daughter cells during mitosis?
A. Their DNA is put into play along with nuclear DNA during mitosis.
B. Enough mitochondria exist to be certain that some will be both resultant cells.
C. The cell forces mitochondria to both ends before division.

5. Mitosis results in creation of two cells from one and must result in two cells with half the mass of the parent cell. What can you conclude regarding the frequency of mitosis from this fact?
A. It's slow because cells must grow to double their size before dividing again.
B. It's moderate in speed because daughter cells can quickly suck in enough fluid to double their size after division.
C. It's fast because cells can divide several times before having to become larger again.
D. It's slow because the cells must recover from the shock of dividing.

6. Plant cells have cell walls. Pick the phase you expect will be most affected by the presence of a cell wall.
A. interphase
B. prophase
C. metaphase
D. anaphase
E. telophase

Explanation / Answer

C,B,C,B,A,D

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