Today, gene swapping between two species is
A. infrequent but possible; it happened more often in the distant past.
B. much more frequent compared to in the distant past.
C. impossible, but it happened frequently in the distant past.
D. only possible if they are in the same family of organisms, such as lions and tigers.
Answer: A
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In sickle cell anemia, affected individuals carry ____
a. one of several different nucleotide substitutions b. the same single nucleotide substitution c. more than one nucleotide substitution d. a number of mutant alleles e. one mutant allele in several genes
Mechanisms that move substances across membranes against concentration gradients are
a. calcium ions in the calcium pump. b. membrane pumps. c. ATP molecules. d. passive transport. e. facilitated diffusion.
Attachment of a bacteriophage to its host requires ________.
A. specific receptor molecules on the host cell B. specific surface proteins on the bacteriophage and specific receptor molecules on the host cell C. specific surface proteins on the bacteriophage D. nucleic acid protein interactions
Which of the following is not a reason(s) that we see an increased rate of disease emergence?
A) climate change B) population crowding C) changes in sociocultural practices (such as injectable illicit drugs, widespread global travel, and increased food processing and handling) D) decreased water quality E) deforestation and urbanization