Down’s syndrome individuals have trisomy of chromosome number ____

a. 1
b. 21
c. 45
d. X
e. Y


ANSWER: b

Biology & Microbiology

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A friend of yours calls to say that his car would not start this morning. He asks for your help. You say that you think the battery must be dead. If so, then jump-starting the car from a good battery will solve the problem. In doing so, you are _____

A) testing a theory for why the car will not start B) making observations to inspire a theory for why the car will not start C) stating a hypothesis and using that hypothesis to make a testable prediction D) comparing multiple hypotheses for why the car will not start

Biology & Microbiology

Four of the five people below influenced Darwin's writing of the book On the Origin of Species by

Means of Natural Selection. Select the exception.

a. Mendel b. Wallace c. Lyell d. Malthus e. Lamarck

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Diatoms tend to be grazed in temperate coastal waters by:

a. amphipods. b. dinoflagellates. c. copepods. d. lobsters. e. radiolarians

Biology & Microbiology

Which cells in the immune system produce memory cells?

A) lymphocytes B) eosinophils C) mast cells D) dendritic cells

Biology & Microbiology