A male has a genetic disease coded for on his Y chromosome. This disease has been seen in his family in past generations. Which parent passed on this trait?
A) the mom
B) the dad
C) either the mom or dad
D) neither parent — it is a spontaneous mutation
B
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A biologist determined the amounts of several amino acids in two separate samples of pure protein. His data stated that Protein A possessed: 7% leucine, 12% alanine, 4% histidine, 2% cysteine, and 5% glycine. Interestingly,
Protein B had the same percentages of each of the same amino acids. He concluded, from this data, that Proteins A and B are the same protein. Based on this information and his conclusion, determine which of the following is the correct statement regarding his findings: A. He is correct; they have the same percentages of each amino acid, so they are identical protein molecules. B. He is incorrect; while they may possess the same percentages of each amino acid, his findings say nothing about the order in which the amino acids are put together. The order will dictate the overall structure of the protein, so the two could be very different in shape, even though the amino acid totals are the same. C. He is correct; the order of the amino acids is irrelevant. It's only the total number of each molecule that is important to structure. D. He is incorrect; he hasn't accounted at all for the effects of pH on the composition of the protein and its effects on the individual amino acids.
What is it called when alleles are randomly lost from a population?
a. mutation b. gene flow c. genetic drift d. nonrandom mating
An unapproved form of gene therapy, known as enhancement gene therapy, can create considerable ethical dilemmas. Why?
What will be an ideal response?
Which of the following are adaptations seen in at least some flowering plants?
A. Adaptations that promote pollination by animals B. Adaptations that promote dispersal of seeds C. Adaptations that promote pollination by wind D. Answers A and C E. Answers A, B, and C