Which of the following can be used to distinguish between a bacterial cell and an archael cell?
A. The presence of a plasma membrane
B. The presence of a nucleus in the cell
C. The presence of ribosomes in the cell
D. The presence of peptidoglycan in the cell wall
E. Answers A and C are correct
F. Answers B and D are correct
G. Answers A, B, and C are correct
Ans: D. The presence of peptidoglycan in the cell wall
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If light were prevented from reaching the right side of both retinas, what would occur?
a. The right half of the visual field would be lost. b. Only the right cerebral hemisphere would be stimulated by the light. c. No information about the light would be carried in the left optic nerve. d. The left half of the visual field would be lost. e. Sight would be lost.
You see a plot of plants that is very dense and small and another plot of the same species with fewer individuals but larger individual plants. What might be the cause of this pattern?
A) herbivory B) contest competition C) water availability D) intraspecific competition
Black-bellied seedcrackers have either small beaks (better for eating soft seeds) or large beaks (better for hard seeds). There are no seeds of intermediate hardness; therefore, which kind of selection acts on beak size in seedcrackers?
A. Stabilizing selection B. Directional selection C. Disruptive selection
A patient returning from an extended trip into Mexico has the following symptoms: a papule at the site of a previous bug bite and enlarged lymph nodes. Microscopic examination of the papule reveals nucleated cells in white blood cells. The patient most likely has
A) anthrax. B) brucellosis. C) leishmaniasis. D) malaria. E) schistosomiasis.