In the thylakoid membranes, the pigment molecules in a light-harvesting complex _____
A) split water and release oxygen from the reaction-center chlorophyll
B) absorb and transfer light energy to the reaction-center chlorophyll
C) synthesize ATP from ADP and i
D) transfer electrons to ferredoxin and then NADPH
B
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Gene silencing refers to:
A. repression of gene expression by the absence of activator proteins. B. repression of gene expression by the presence of repressor proteins. C. the absence of gene expression due to its location in the genome. D. All of the choices are correct.
Which of the following forms of Plasmodium
carried by an infected mosquito infects humans?
a. merozoites b. gametocytes c. cysts d. sporozoites e. spores
Which chemical released by white blood cells causes capillaries to leak?
a. cytokines b. histamine c. interferons d. complement e. interleukins
Photosynthetic pigments in bacteria are located in the
A. cell wall. B. chloroplasts. C. plasma membrane. D. plasmids. E. nuclei.