High levels of hormones as a result of exogenous treatment will
a. often produce excess blood levels of the hormones, causing feedback system to cause
further increases.
b. often cause negative feedback systems to stop functioning in a normal fashion.
c. convert negative feedback systems to positive feedback systems.
d. have no effect on normal feedback systems.
e. cause positive feedback systems to be inhibited.
B
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Humans have a gene called PDHA1, which codes for one protein that functions as an enzyme in the cell. It helps energy pathways by modifying pyruvate molecules into acetyl CoA molecules. Researchers have identified an insertion mutation in the gene, which produces an extra amino acid within the otherwise normal sequence in the protein. In this type of mutation
A. the mutation is not in DNA, but in the protein. B. the codon that mutates causes a stop codon to occur instead of the placement of an amino acid. C. the codon that mutates causes a change in the amino acid specified. D. the mutation does not occur in an existing codon. E. the mutation may be caused by an addition of three nucleotides.
Under aerobic conditions, the end-product of glycolysis is further reduced to yield more ATP
a. true b. false
Which of the following pairs indicates the closest
macroevolutionary link among the animals according to the evolutionary history tree in the text? a. flatworms; roundworms b. sponges; cnidarians c. arthropods; annelids d. arthropods; roundworms e. echinoderms; mollusks
A person is exposed to rotten wood with fungal growth and develops blastomycosis. No one taking care of him/her becomes ill. Blastomycosis is an example of a ________ disease
A) contagious B) subacute C) chronic D) noncommunicable E) latent