True flight first arose in
A) Bats.
B) Birds.
C) Insects.
D) Reptiles.
Answer: C
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In which organelle are carbohydrate chains added to glycoproteins?
A. Mitochondrion B. Lysosome C. Golgi apparatus D. Smooth endoplasmic reticulum E. Nucleus
Helper T cells do all of the following except
A) trigger B-cell division, plasma cell maturation, and antibody production. B) provide a rapid response to a future exposure to the antigen. C) enhance production of memory and cytotoxic T cells. D) attract macrophages to the affected area. E) enhance nonspecific defenses.
Distortion of hair cells in the cochlea causes
A. initiation of action potentials in CN VI. B. bending of the basilar membrane. C. movement of the tympanic membrane. D. initiation of action potentials in CN VIII.
The refractory period of cardiac muscle
a. lasts almost as long as the contraction period. b. is much longer than the refractory period in skeletal muscle. c. allows tetanic contraction of the heart to occur to ensure smooth, coordinated ejection of blood from the ventricles. d. both (a) and (b) above. e. all of these answers.