Cytotoxic T cells contain which type of molecules that punch holes in the plasma membranes of potential pathogens?
A. perforin
B. antioxidant
C. interferon
D. steroid
E. complement
Answer: A
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Before plowing a field, a farmer thought the bare field looked weed-free. Three days after plowing and turning over the soil, he was amazed to see thousands of tiny seedlings. What is the most likely reason for the mass germination of seeds?
A) large seeds that needed soil disturbance to germinate B) small seeds that need light to germinate C) small seeds that were scarified by exposure to plow D) large seeds that needed exposure to higher levels of oxygen to germinate
What enzyme is produced by the human body following a snack on a donut?
A. Glucagon B. Insulin C. Both insulin and glucagon D. No enzyme is produced following a snack; enzymes are not triggered by food consumption.
Clusters of cell bodies of neurons outside the central nervous system are known as
a. nerve cords. b. ganglia. c. a plexus. d. notochords. e. nerves.
A hungry newborn human infant, touched on the side of her mouth, will turn her head and attempt to suckle. This behavior is
A) innate. B) not under genetic control. C) learned. D) nonadaptive.