Which of the following are abiotic components?
A. trees, birds, insects, rainfall, and sunlight
B. trees, birds, and insects only
C. birds and insects only
D. trees only
E. rainfall and sunlight only
Answer: E. rainfall and sunlight only
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A point mutation that causes a premature stop codon is called a:
A. missense mutation. B. nonsense mutation. C. silent mutation. D. frameshift mutation.
The most abundant protein in the world is the enzyme that initiates the fixation of carbon in the Calvin cycle. This enzyme is called
a) rubisco b) glyceraldehyde 3-phosphate c) ATP-synthase d) ribulose biphosphate e) crassulacean acid
Although a nonhuman reservoir for Helicobacter pylori has not been identified, it is considered a direct contact disease because
a. it occurs in clusters in certain areas. b. it predominates in families. c. it is related to food ingestion. d. it occurs in clusters and predominates in families.
One motor unit obeys a principle called the all-or-none law.
Answer the following statement true (T) or false (F)