Chapter 5 test

1. Chromatin is composed of what substances?
RNA.
lipids.
DNA.
protein.
RNA, DNA, and protein.

2. Which of the following is involved in cell division?
disappearance of nuclear envelope.
reappearance of nuclear envelope.
chromosome condensation.
changes in the cytoskeleton.
all of the above.

3. The members of a homologous pair of chromosomes are matched in ________.
size.
shape.
gene content.
size and shape.
all of the other answers.

4. An organism contains 18 chromosomes in its gamete. How many chromosomes would there be in one non-gametic cell?
18.
9.
36.
27.
54.

5. Cells that have stopped dividing are said to be in what stage of the cell cycle?
G0.
G1.
M.
G2.
Q.

6. An organism has 42 chromosomes. How many linkage groups does it have?
42.
84.
40.
21.
none of the above.

7. Some genes are capable of moving from one chromosomal locus to another. There is evidence this has happened a number of times over the course of evolution. What are such genes called?
jumping genes.
gluons.
travelons.
transposons.
jumping genes and transposons.

8. Of what are the spindle fibers composed?
microtubules.
microfilaments.
flagella.
centrioles.
metaphase.

9. In what process and stage do homologous chromosomes separate?
Anaphase of mitosis.
Prophase of mitosis.
Anaphase II of meiosis.
Meiotic mitosis.
Anaphase I of meiosis.

10. How many water molecules were formed during the construction of a polynucleotide chain comprised of 2104 nucleotides?
2104.
4208.
2103.
4206.
1052.