According to Chargaff's rule, if the DNA of a species contains 20% adenine, what percent of guanine will it contain?
A. 20%
B. 30%
C. 50%
D. 75%
B
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If the multiregional hypothesis of human origins is correct, modern human populations last shared a common ancestor around _____ years ago. If the out-of-Africa hypothesis is correct, we last shared a common ancestor around _____ years ago
A. 2 million; 200,000 B. 3.2 million; 2 million C. 5-7 million; 2 million D. 5-7 million; 200,000 E. 3.2 million; 200,000
If an individual has 10 gene pairs, how many different gametes can be formed if three of the gene pairs are homozygous and the remaining seven gene pairs are heterozygous?
A) 49 B) 100 C) 128 D) 1024 E) 131,072
Which of the following is NOT true about exons?
a. They are retained sequences in the final RNA product. b. They have a 5? and a 3? end. c. They are removed when the primary transcript is processed. d. Their sequences are in the same order in the gene and in the RNA. e. All of the above are true
Stem cells are said to be pluripotent. This means they have the ability to:
A) specialize into only a few different types of cells such as nerves and muscle cells. B) form blastocysts. C) make more of themselves in culture. D) specialize into any other type of cell. E) be reprogrammed through recombinant DNA technology.