Which component of amino acids accounts for the differences in their properties?
A) the amino group
B) the carboxyl group
C) the side group
D) the type of bonds
C
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During generalized transduction
A. the host chromosome is degraded into randomly sized fragments. B. any bacterial gene may be transferred to the subsequent host. C. any DNA fragment of the appropriate size is packaged. D. All of the choices are correct.
The most abundant protein on Earth is:
A. chlorophyll. B. cellulose. C. rubisco. D. water. E. keratin.
You have calculated the interference value for a given mapping experiment to be 30%. What does this mean?
A. 30% more double crossovers occurred than expected B. 30% fewer double crossovers occurred than expected C. 70% more double crossovers occurred than expected D. 70% fewer double crossovers occurred than expected
The peppered moth provides a well-known example of natural selection. The light-colored form of the moth was predominant in England before the Industrial Revolution. In the mid-nineteenth century, a dark-colored form appeared. The difference is produced by a dominant allele of one gene. By about 1900, approximately 90% of the moths around industrial areas were dark colored, whereas light-colored moths were still abundant elsewhere. Apparently, birds could readily find the light moths against the soot-darkened background in industrial areas and, therefore, were eating more light moths. Recently, use of cleaner fuels has greatly reduced soot in the landscape, and the dark-colored moths have been disappearing. Should the two forms of moths be considered separate species?
A) Yes, because natural selection has affected the frequency of the two different forms. B) Yes, because they have completely different coloration. C) Yes, because they are reproductively isolated based on habitat. D) No.