Why is it warmer in the tropics?
a. solar rays travel more directly into the
tropics
b. less dust in the atmosphere above the
tropics
c. less water vapor in the atmosphere above
the tropics
d. less absorption by greenhouse gases
e. all of these are reasons why the tropics are
warmer
E
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Sister chromatids ______
a. are separated during anaphase I b. have different alleles for the same genes c. are replicated before meiosis I and II d. are replicated before meiosis II e. have identical DNA sequences
Photosynthesis first occurs on Earth by about
___ years ago.
a. 4.6 billion b. 3.5 billion c. 2.7 billion d. 1.1 billion e. 0.5 billion
Capsules play a role in the virulence of all of the following except __________.
A) Mycobacterium tuberculosis B) Yersinia pestis C) Klebsiella pneumoniae D) Haemophilus influenzae E) Bacillus anthracis
Select the TRUE statement(s) about saltwater fish when compared to freshwater fish. (Select all that apply.)
a. Have much higher blood osmotic pressure b. Drink more water c. Excrete more NaCl at the gill d. Urinate less e. All of the above