In the mechanics of conjugation, exclusive of gene transfer, Hfr and F+ strains behave the same.
Answer the following statement true (T) or false (F)
True
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Phosphofructokinase (PFK) is an enzyme that converts fructose 6-phosphate to fructose 1,6-bisphosphate, by adding a phosphate group. This is the first committed step of the metabolic pathway of glycolysis, and thus it is very tightly regulated. AMP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and stimulates the formation of fructose 1,6-bisphosphate. ATP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and inhibits the formation of fructose 1,6-bisphosphate. There are other regulators of this enzyme as well. What is the role of AMP in this example?
A. Competitive inhibitor B. Noncompetitive inhibitor C. Allosteric inhibitor D. Allosteric activator E. Catalyst
A biologist discovers a new species of organism adapted to living in a deep underground cavern that provides no source of free water. The organism is eyeless and covered by fur, and it has a four chambered heart with a closed circulatory system. What excretory system adaptations to this extreme environment might the biologist expect to find?
A. Very long malpighian tubules B. Very short malpighian tubules C. Metanephridia with a large number of nephridiopores D. Nephrons with long loops of Henle E. Nephrons with short loops of Henle
Four of these are correctly matched. Select the
exception. a. cnidarians; nematocysts b. sponges; spicules c. flatworms; bilateral symmetry d. echinoderms; protostomes e. annelids; segmented body
Which of the following is not true of the preliminary findings by the HMP thus far?
A. microbial antagonism prevents potential pathogens in the resident biota from causing disease B. the number of bacterial genes outnumber human genes by millions in the holobiont C. viruses have played an important role in guiding the evolution of both humans and their resident flora D. there are many more sterile sites in the human than were previously assumed