According to your text, in which of the following steps of the TCA cycle is NADH/FADH2 not produced?
A) TCA-2
B) TCA-3
C) TCA-4
D) TCA-6
E) TCA-8
A) TCA-2
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Diatoms are mostly asexual members of the phytoplankton. Diatoms lack any organelles that might have the 9 + 2 pattern
They obtain their nutrition from functional chloroplasts, and each diatom is encased within two porous, glasslike valves. Which question would be most important for one interested in the day-to-day survival of individual diatoms? A) How does carbon dioxide get into these protists with their glasslike valves? B) How do diatoms get transported from one location on the water's surface layers to another location on the surface? C) How do diatoms with their glasslike valves keep from sinking into poorly lit waters? D) How do diatoms with their glasslike valves avoid being shattered by the action of waves? E) How do diatom sperm cells locate diatom egg cells?
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
Which of the following is not a function of histone H1?
A. stabilizing nucleosomes B. promoting higher order chromosome structure C. enhancing the repression of transcription by nucleosomes D. binding to regions undergoing active RNA synthesis E. All of these options are functions of histone H1
What type of bonding is likely to occur between two water molecules or strands of DNA?
A. covalent B. ionic C. hydrogen D. both hydrogen and covalent E. both hydrogen and ionic