A mutation in a particular bacterial gene prevents the formation of a hairpin loop. This is most likely to affect which part of transcription?
A) This mutation will affect elongation.
B) This mutation will affect termination.
C) This mutation will affect initiation.
D) This mutation will affect initiation, elongation, and termination.
E) This mutation will not affect any aspect of transcription in bacteria.
Answer: A
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Fecal coliforms are useful indicator organisms for the contamination of water by ________.
A. sewage B. agricultural fertilizer runoff C. phosphates D. All of these choices are correct.
Which of the following is not true concerning the structures labeled 4 in Figure 37-3:
a. They are the cotyledons. b. They indicate that this plant is a eudicot. c. They are part of the embryo. d. They are surrounded by endosperm. e. They are derived from the integuments.
A plant breeder can use plum pollen to hand-fertilize an apricot flower. The fruit contains fertile seed that grows into a hybrid called a plucot. However, in the natural environment, plums and apricots bloom several weeks apart
Why are plums and apricots considered separate species?
In which example are the proximate cause and the ultimate cause of morphological evolution correctly matched?
A. Proximate: point mutations in protein coding genes affect protein function and structure, ultimate: chemical and physical configuration of a protein affect its function B. Proximate: cis-regulatory elements are found upstream of a gene; ultimate: cis regulation is required to activate a gene C. Proximate: natural selection causes morphology to differ among species, ultimate: natural selection prevents morphological variation within a species D. Proximate: changes in gene regulation lead to changes in morphology; ultimate: natural selection favors morphologies that work best in their environment E. Proximate: natural selection favors gene combinations that have high fitness in their environment; ultimate: genetic changes alter morphology and fitness