The distinctive feature of chloroplasts is that they contain a green pigment called:
A. Gram stain.
B. chlorophyll.
C. hemoglobin.
D. chromatin.
E. keratin.
B. chlorophyll.
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A lizard is sitting on a rock on a cool, cloudy morning. As the day progresses the sun comes out and the temperatures of the rock and the lizard increase. What changes would be expected in the lizard's metabolic rate and activity level?
A. Both the metabolic rate and activity level would increase. B. Both the metabolic rate and activity level would decrease. C. The metabolic rate would increase and the activity level would decrease. D. The metabolic rate would decrease and the activity level would increase. E. The metabolic rate and activity level would not change.
The ________ pathway is important in early nonspecific responses to infection because it occurs in the absence of antibodies.
A) cell-mediated B) alternative C) clonal selection D) classic E) humoral
The technique used to produce the data displayed might be useful for a cancer biologist who wishes to
A) determine whether a drug can prevent cell division. B) determine the effect of a drug on microtubule assembly. C) determine the effect of drugs on protein synthesis at various times in the cell cycle. D) determine the effect of a drug on mitochondrial function.
If alleles R and s are linked on one chromosome and r and S are linked on the homologous chromosome, what gametes will be produced? (Assume that no crossing-over occurs.)
a. RS, Rs, rS, rs b. RS, rs c. Rs, rS d. R, S, r, s