Chapter 1: The Genetics Revolution

MULTIPLE-CHOICE QUESTIONS

Section 1.1 (The birth of genetics)

1. The early 1900s was an important period for genetics due to which of the following major events?
2. the rediscovery of Gregor Mendel’s scientific findings
3. Watson and Crick solving the structure of DNA
4. Walter Sutton and Theodore Boveri hypothesizing that chromosomes are the hereditary elements
5. All of the answer options are correct.
6. the rediscovery of Gregor Mendel’s scientific findings and Walter Sutton and Theodore Boveri hypothesizing that chromosomes are the hereditary elements

Answer: E

2. A sample of normal double-stranded DNA was found to have a guanine content of 18%. What is the expected proportion of adenine?
3. A) 9%
4. B) 32%
5. C) 36%
6. D) 68%
7. E) 82%

Answer: B

3. In one strand of DNA the nucleotide sequence is 5′-ATGC-3′. The complementary sequence in the other strand must be:
4. A) 3′-ATGC-5′.
5. B) 3′-TACG-5′.
6. C) 5′-ATCG-3′.
7. D) 5′-CGTA-3′.
8. E) 5′-TACG-3′.

Answer: B

4. How many different DNA molecules that are eight-nucleotide pairs long are theoretically possible?
5. A) 24
6. B) 32
7. C) 64
8. D) 256
9. E) 65,536

Answer: E

5. Which of the following is/are FALSE about genes?
6. Genes are located on chromosomes.
7. Genes come in variants known as alleles.
8. Genes always encode protein products.
9. All of the answer options are correct.
10. None of the answer options are correct.

Answer: C

6. Wild cats (Felis silvestris) and common mice (Mus musculus) are diploid. In wild cats 2n = 38, while in common mice 2n = 40. Based on this information, we can conclude that wild cat cells have:
7. A) less DNA than common mouse cells.
8. B) smaller genomes than common mouse cells.
9. C) fewer DNA molecules than common mouse cells.
10. D) fewer genes than common mouse cells.
11. E) fewer sets of chromosomes than common mouse cells.

Answer: C

7. Which of the following is a component of DNA?
8. A) alanine
9. B) arginine
10. C) cysteine
11. D) guanidine
12. E) tyrosine

Answer: D