Which of the following membranes of the amniotic egg assists in gas exchange?
a. yolk sac
b. chorion
c. amnion
d. allantois
b
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The most serious type of mutation is a ________ mutation.
A. frameshift B. point C. silent D. back
Actinomycetes are usually found in ________ habitats.
A. freshwater B. marine C. medical D. soil
The major opposition to the Extraterrestrial Hypothesis is ...
A. not enough organic carbon molecules could have been transported to the Earth's surface by comets and asteroids. B. most organic carbon molecules, including nucleic acids and amino acids, would have been destroyed by the intense heating that occurs when large bodies fall through the Earth's atmosphere. C. not enough comets and asteroids hit the Earth to deliver organic carbon molecules to the surface. D. most of the organic carbon molecules would have fallen into the seas, helping life form in the water but not on the land. E. without oxygen in the atmosphere the organic carbons that did fall would have been rapidly reduced to inorganic carbon compounds.
In order to generate one glucose molecule, the Calvin cycle has to turn how many times?
A. 3 B. 6 C. 12 D. 2 E. 1