A gene mutation ______________.
A. is a temporary change in the nucleotide sequence of DNA
B. may be caused by environmental agents
C. always arises spontaneously
D. occurs only in eukaryotes
E. is always damaging to the organism
Answer: B
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Which of the following groups of animals does NOT exhibit a "double circulation" and four-chambered hearts?
A. mammals B. birds C. crocodilians D. snakes E. All of the groups listed exhibit a complete double circulation.
When Pfr absorbs far-red light, the Pfr is converted to Pr. Indicate whether the statement is true or false
In aquatic ecosystems, primary productivity is most dependent on
A) species richness and diversity B) the type of soil C) the rate of photosynthesis D) organic nutrients E) inorganic nutrients
Which of the following are the final by-products of glucose oxidation during aerobic cell respiration?
ATP only heat only carbon dioxide and water only both ATP and heat only ATP, heat, carbon dioxide, and water