The figure below depicts a human embryo. The cells in the inner cell mass (indicated by the arrow) are
A. pluripotent.
B. multipotent.
C. unipotent.
D. totipotent.
E. omnipotent.
Answer: A
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Proteins are three dimensional molecules made of strands of amino acids (imagine a ball of string). There are 20 different amino acids used in proteins found in living organisms. Some of these amino acids are polar and others are non-polar. Where would a series of non-polar amino acids most likely be located in a protein that is found in the cytosol of an animal cell?
A. On the surface of the protein B. In the interior of the protein C. At the very top of the protein D. At the very bottom of the protein
Most known plant viruses are RNA viruses.
Answer the following statement true (T) or false (F)
A prolonged, relatively mild period with ample precipitation alternates with a cold period when plants become dormant
(A) deciduous forest (B) Tropical rain forest (C) Desert (D) Tundra (E) Taiga
Sometimes including independent variables in a regression serve as a "data sanity check," in so much as they facilitate a:
A. comparison between the estimated coefficient for that variable and the value for that coefficient as predicted by theory. B. secondary measure of the standard error of the treatment effect of interest. C. more unbiased estimate of the treatment effect D. more efficient estimate of the treatment effect in question.