When you are lifting weights, the arterioles

servicing your biceps are



a. constricted.
b. dilated.
c. supplying less blood.
d. shut down.
e. doing more than one of these


B

Biology & Microbiology

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During ____ photosynthesis, H2S, H2, Fe2+ or AsO3 3 - can be oxidized

Fill in the blank with the appropriate word.

Biology & Microbiology

Which area of the cerebral cortex is important for the formulation of thoughts into speech?  

A.  Broca's area B.  the pons C.  the medulla oblongata D.  Wernicke's area E.  the cerebellum

Biology & Microbiology

The signal from the environment that triggers a stereotyped behavior is a  

A.  conditioned reflex. B.  fixed action pattern. C.  reinforcing stimulus. D.  releasing mechanism. E.  key stimulus (sign stimulus).

Biology & Microbiology

GGG and GGC are codons for the amino acid, glycine. A mutation caused the insertion of a cytosine in place of the guanine during DNA replication. Over many generations the DNA changes so that the frequency of GGC is similar to that of GGG. What effect does this mutation have on the population's mean fitness?

A. As the frequency of the GGC codon increases, the population's mean fitness level will initially increase, but once GGC and GGG occur with equal frequency, the mean fitness will decrease. B. As the frequency of the GGC codon increases, the population's mean fitness level will remain the same. C. As the frequency of the GGC codon increases, the population's mean fitness level will decrease. D. As the frequency of the GGC codon increases, the population's mean fitness level will increase.

Biology & Microbiology