Visual pigments are derivatives of the compound
A) retinal.
B) opsin.
C) rhodopsin.
D) transducin.
E) cGMP.
Answer: C
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Answer the following statement true (T) or false (F)
The bones of the wrist are called tarsals
a. True b. False Indicate whether the statement is true or false
Which cells present antigens in the thymus?
A. Natural killer cells B. B lymphocytes C. Cytotoxic T cells D. Epithelial cells E. Helper T cells
________ serous membranes line the walls of cavities, whereas ________ serous membranes cover the surfaces of internal organs
A) Parietal; visceral B) Visceral; parietal C) Pericardial; peritoneal D) Pleural; visceral