In meiosis, the number of chromosomes ______ while in mitosis, it ______
a. is halved/is doubled
b. is halved/remains the same
c. is doubled/is halved
d. remains the same/is halved
a
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Endotoxin is released when
A. cells are lysogenic for the beta phage. B. cells are starved for iron. C. Gram-negative pathogens lyse or divide. D. All of the choices are correct.
Calcitonin is produced in the ___ and is
important for the uptake of ___ by bones.
a. anterior pituitary---calcium b. posterior --- phosphorus c. posterior---calcium d. hypothalamus---calcium e. hypothalamus---phosphorus
Activated complement proteins
a. produce antigens. b. destroy invading cells. c. mark invading cells for phagocytosis. d. bind to antibodies. e. do more than one of these things
Four of the following statements about lizards are true. Which statement is false?
A. Lizards are a very small component of the present-day reptiles. B. Lizards and snakes are more closely related to each other than to turtles. C. Some lizards are not predators. D. Lizards have overlapping scales on their bodies. E. All lizards have three-chambered hearts.