The killing of cells by UV irradiation involves
A) absorption at 260 nm by proteins only.
B) absorption at 260 nm by RNA only.
C) formation of pyrimidine dimers.
D) formation of purine dimers.
Answer: C
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No matter what model is used to show community succession, the final stage is always
A. a climax community. B. a secondary community. C. a sere. D. a resilient community.
Four of the five answers are traits of amphibians. Select the exception
a. carnivores b. amniote c. scaleless d. land dwelling e. typically breed in water
The speed of impulse conduction along an axon may be increased by
A) myelin sheaths. B) graded potentials. C) neurotransmitters. D) effector cells.
A cell is infected with a virus carrying an oncogene sequence in its genome. What process may occur if the oncogene is expressed in the infected cell?
A) lysis B) neoplasia C) lysogeny D) latency E) both lysis and neoplasia