The breakup of Pangaea probably caused sympatric speciation in many animals.
a. true
b. false
Ans: b. false
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Antigen exposure is necessary to
A) induce genetic hypermutation in B cells with productive antibody genes. B) stimulate B cell to differentiate to plasma cell. C) stimulate B cell to produce soluble antibodies. D) stimulate B cell differentiation, antibody production, and genetic hypermutation of antibody genes.
Which of the following statements regarding the Ras protein is false?
A) Ras is monomeric. B) It is regulated by GTPase activating proteins. C) The ligands are largely steroid hormones. D) It is regulated by Sos, a guanine nucleotide exchange factor. E) Ras activates a cascade of phosphorylation events.
Viruses are often used as cloning hosts in recombinant DNA methods.
Answer the following statement true (T) or false (F)
A new antibiotic has been developed. It acts as a noncompetitive inhibitor. How will this antibiotic affect delta G for the enzyme-catalyzed reaction?
A. Delta G will increase. B. Delta G will be unaffected. C. Delta G will decrease.