A tumor that is classified as malignant is described as:
A. a disorganized mass that is not encapsulated and can invade nearby organs.
B. a slow-growing, organized mass of encapsulated cells.
C. usually confined to the skin.
D. an area of swelling that shows no abnormal growth of cells.
Ans: A. a disorganized mass that is not encapsulated and can invade nearby organs.
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A commercial fisherman is very concerned that overfishing will result in a decrease in tuna population size, thus affecting his catches in future years. What strategy can he employ to make sure that the tuna population can be sustained in the long term?
A. He can only catch young, non-reproducing fish. B. He can only catch old fish (past the reproductive age). C. He can only catch fish at the reproductive age.
What evidence suggests when oxygen gas first
became a significant part of Earth’s atmosphere?
a. multi-celled microorganisms that breathed oxygen b. fossils of dinosaurs c. molten rock from volcanoes that were rich in oxygen d. rusty rocks indicating oxidized iron e. the presence of water vapor in the atmosphere
Members of the same species must
a. look alike. b. be reproductively isolated from one another. c. share the same gene pool. d. resist interbreeding. e. produce the same variations.
What is the molecular basis of touch sensation?
A. Cell membrane distortion opens touch receptors, creating a receptor potential. B. Pressure damages the delicate strands of skin cell DNA, activating a complex signalling cascade. C. Pressure on the skin squeezes out chemical signals from epidermal glands. D. Pressure on sensory axons bursts vesicles and causes neurotransmitter release.