What is the role of light in photosynthesis?
A) It is the source for electrons.
B) It fixes carbon.
C) It energizes electrons.
D) It splits ATP molecules, which generates energy.
C
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Annual growth rings are formed in woody
stems principally through the activities of the
a. cork cambium. b. cortex. c. vascular cambium. d. apical meristem. e. endodermis
Constipation can be caused by
a. emotional stress. b. a low-fiber diet. c. a sedentary lifestyle. d. dehydration. e. all of these.
Cytotoxic T cells are involved in which of the following action(s)
I. Antigen presentation II. Tumor destruction III. Cell lysis of virus infected cells A. I only B. II only C. I and II only D. II and III only E. I, II and III
Under standard conditions, ATP can release for every molecule converted to ADP
A. less than 1 cal of energy. B. 7.3 Kcal of energy. C. 1 to 2 cal of energy. D. different amounts of energy depending on the cell.