Which of the following is a similarity between male and female reproductive systems?
A. They both store gametes.
B. They both release gametes.
C. They both produce haploid gametes.
D. All of the above are similarities between the two systems.
Answer: D
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An autoimmune disease occurs when:
A. immune cells react too strongly with antigens normally present on host cells. B. there is an unregulated release of cytokine by helper T cells. C. cytotoxic T cells attack B cells. D. macrophages engulf normal host cells.
The respiratory pacemaker is located in the
a. lungs. b. cerebral cortex. c. brain stem. d. bronchioles. e. alveoli.
Which part of the hemoglobin molecule actually binds the oxygen molecule? Which part binds carbon dioxide?
A. globin chain; heme B. globin chain; globin chain C. heme; globin chain D. cell membrane; cell wall E. heme; heme
In lakes, rooted plants may grow in the ________ zone but no photosynthesizing life is found in the ________ zone
A) littoral; profundal B) profundal; pelagic C) littoral; benthic D) benthic; profundal E) littoral; pelagic