Candidate genes for the inherited components of mood disorders affect
A) muscle and nerve cell function.
B) connective tissue function.
C) signal transduction and neurotransmission.
D) cellular adhesion and blood clotting.
C) signal transduction and neurotransmission.
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Most true fungi send out cellular filaments called ____
a. mycelia b. hyphae c. mycorrhizae d. stolons e. rhizoids
The distribution in Figure 55-1 could be inverted:a
if the producers had a high rate of productivity and reproduction, coupled with intense predation. b. if the rate of biomass production of the primary consumers is greater than that of the producers. c. if the rate of productivity of the primary consumers is greater than the primary productivity. d. if the standing biomass of the producers is greater than the biomass of all of the consumers. e. only under artificial or laboratory conditions.
Carpal tunnel syndrome is caused by an inflammation of tendons passing through the carpal tunnel of the wrist. What causes this inflammation and pain?
A) The associated muscles are too weak and begin to spasm, leading to inflammation. B) The muscles eventually fatigue and become swollen, thus swelling the tendon. C) The tendons become stretched out and ultimately tear away from the bone. D) Certain continuous hand motions cause the tendons to repeatedly rub against bone.
Male cockroaches with mutations that strongly decrease the function of an RTK called RTKX are oblivious to the charms of their female comrades. This particular RTK binds to a small molecule secreted by sexually mature females
Most males carrying loss-of-function mutations in the gene for Ras protein are also unable to respond to females. You have just read a paper in which the authors describe how they have screened cockroaches that are mutant in RTKX for additional mutations that partly restore the ability of males to respond to females. These mutations decrease the function of a protein that the authors call Z. Which of the following types of protein could Z be? Explain your answer. (a) a protein that activates the Ras protein by causing Ras to exchange GDP for GTP (b) a protein that stimulates hydrolysis of GTP by the Ras protein (c) an adaptor protein that mediates the binding of the RTKX to the Ras protein (d) a transcriptional regulator required for the expression of the Ras gene