Genetics MCQ Questions and Answers for Practice

1. Proteins are made of amino acids linked together by specific bonds called

1. Peptide bonds
2. Nitrogen bonds
3. Hydrogen bonds
4. Hydrogen & Nitrogen bonds

2. What are the repeating units of nucleic acids?

1. phosphate molecules
2. nucleotides
3. bases
4. sugar molecules

3. ______ is a genetic changes that occur in more than 1 percent of the population

1. Polymorphisms
2. Monotheism
3. Frameshift mutation

4. Which of the following is not needed for DNA transcription?

1. Ribosomes
2. Nucleotides
3. DNA
4. Enzymes

5. A pedigree chart shows:

1. The genotypic ratios of the offspring.
2. The types of gametes produced by the parents.
3. The pattern of inheritance of a specific gene.
4. Which genes are co-dominant.

6. BRCA-1 is associated with which cancer?

1. Thyroid
2. Leukemia
3. Lung
4. None of the above

7. A heritable feature is a ______ and may have two or more variants called

1. trait/characteristics
2. character/traits
3. character/factors
4. trait/factors

8. Proteins that assist the binding of RNA polymerase to the promoter region on DNA strand are called

1. Transcription factor
2. SSB protein
3. Sigma factor
4. All of the above

9. Cancer cells are

1. Unlimited number of cell divisions
2. Growth without external signals
3. Avoidance of cell death
4. All of the above

10. Normal human eggs have

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

11. 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.

12. 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

13. 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

14. 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

15. 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