Intertidal mud flats in tropical regions are typically composed of
A) salt marshes.
B) peatlands.
C) mangrove forests or mangals.
D) oysterbeds.
C
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The only survivors of a colony on Venus are a man and a woman, who both happen to originally be from southern
Ukraine. Their descendants will show the effect of ____.
a. genetic drift b. punctuated equilibrium c. excessive mutation d. heterozygote advantage e. frequency-dependent selection
During G2, a cell produces ________
a. daughter cells b. the bipolar spindle c. proteins that drive mitosis d. newly synthesized DNA
In some G-protein-coupled-receptors, cyclic AMP (cAMP) acts as a(n)
1.first messenger. 2.second messenger. 3.effector. 4.protein kinase. 5.extracellular signal.
Normal bacterial inhabitants of the human body
a. are naturally resistant to antibiotics. b. are able to out-compete some invading pathogens and thus are one of the body’s initial defense mechanisms. c. can be transformed into pathogenic forms if a person’s resistance to disease is low. d. are unable to survive the human body’s defense mechanisms. e. are able to out-compete some invading pathogens and thus are part of the body’s innate immunity.