SAT II Biology E : Genes and Chromosomes

Study concepts, example questions & explanations for SAT II Biology E

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Example Questions

Example Question #13 : Genetics

If an organism has a diploid number of 36, what is its haploid number?

Possible Answers:

18

12

72

36

9

Correct answer:

18

Explanation:

Haploid cells contain only one of each numbered chromosome, whereas diploid cells contain two of each. Therefore, a haploid cell in a given organism would contain half as many chromosomes as would be in a diploid cell of the same organism.

Example Question #14 : Genetics

In DNA molecules, Adenine pairs with which of the following nucleic acid bases?

Possible Answers:

Thymine

Deoxyribose

Uracil

Guanine

Cytosine

Correct answer:

Thymine

Explanation:

In DNA, the four nucleic acid basis are adenine, guanine, cytosine, and thymine. RNA has uracil instead of thymine. Adenine pairs with thymine in DNA and uracil in RNA. Cytosine and Guanine pair together in both. Deoxyribose and ribose are the 5-carbon sugars in DNA and RNA nucleotides, respectively. 

Example Question #15 : Genetics

If an organism's haploid number is 14, what is its diploid number?

Possible Answers:

36

7

14

28

56

Correct answer:

28

Explanation:

Haploid cells contain one of each numbered chromosome, for a chromosome number of "n." Diploid cells contain two of each, so the number of chromosomes in a diploid cell is 2n, or twice the haploid number.

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