Genetics Multiple Choice Questions and Answers

1. Normal human eggs have

1. 22 autosomes and an X chromosome.
2. 22 autosomes and a Y chromosome.
3. 23 autosomes.
4. 46 chromosomes.

2. The cytoplasm of an animal cell is divided by means of:

1. A cleavage furrow.
2. A cell plate.
3. A cell membrane formed within the cytoplasm.
4. Mitosis.

3. Which of the following is correct?

1. A forms 2 hydrogen bonds with G; T forms 3 hydrogen bonds with C
2. A forms 3 hydrogen bonds with T; G forms 2 hydrogen bonds with C
3. A forms 2 covalent bonds with T; G forms 3 covalent bonds with C
4. A forms 2 hydrogen bonds with T; G forms 3 hydrogen bonds with C

4. Which of the following may contribute to causing cancer?

1. a mutation in a gene that slows the cell cycle
2. faulty DNA repair
3. loss of control over telomere length
4. all of the above

5. Which of the following is not true of DNA?

1. A pairs with T and G pairs with C
2. Nitrogen bases are 0.34 nm apart on a DNA strand
3. The double helix is 2.0 nm wide
4. The double helix is 3.4 nm wide

6. Those mutations that occur by environmental damage or mistakes during DNA replications are

1. Acquired mutations
2. Inherited mutations
3. A and B
4. None of these

7. Why is sickle cell disease so called?

1. because it makes people sick
2. its named after a special type of white blood cell
3. pH changes in the blood cells make them collapse into a sickle shape
4. because its caused by an infectious microorganism that has sickle shaped cells

8. Those cancers that derived from ectoderm or endoderm of epithelial cell are called

1. Carcinoma
2. Sarcoma
3. Leukaemia
4. Myeloid

9. During cell division there are three types of check points one of them (M checkpoint) to ensure

1. Chromosomes are attachedto the spindle
2. Complete DNA replication
3. DNA not damage or broken
4. All of the above

10. Proto-oncogene in normal cells

1. Code for proteins involved in the stimulus of cell division
2. Suppresses progression through the cell cycle in response to DNA damage
3. Initiates apoptosis
4. None of the above