The principal role for sugars in living organisms is to
A. create cellular energy.
B. produce hormones.
C. serve as a form of long-term energy storage.
D. form cell membranes.
E. create our genetic code.
Answer: A
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According to the multiregional model,
a. Homo erectus populations migrated out of Africa. b. Homo erectus evolved further in regions beyond Africa. c. Homo erectus populations gave rise to races of Homo sapiens. d. Homo sapiens subpopulations originated in several separate locations. e. all of these are true.
You decide to go on vacation in the mountains, where you are staying in a cabin. Unfortunately, when you turn on the water in the cabin you smell hydrogen sulfide (H2S) gas. After some research, you find out that the H2S may be due to the presence of sulfur bacteria living in your pipes. What molecule do these bacteria use as an electron acceptor?
A. O2 B. H2O C. H2S D. SO42-
What are the three common epidemiological measurements used in this exercise and by the CDC?
A) Morbidity, Mortality, and Incidence B) Mortality, Incidence and Prevalence C) Incidence, Prevalence, and Morbidity
Tritiated hydrogen (3H) differs from hydrogen (1H) in that
A. 3H has 2 more electrons than 1H. B. 3H has 2 more neutrons than 1H. C. 3H has the same number of neutrons as 1H. D. 3H has a different electron configuration than 1H. E. 3H has 2 more protons than 1H.