The head end of an animal is known as its:a
posterior end.
b. ventral end.
c. inferior end.
d. lateral end.
e. anterior end.
e
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Phosphofructokinase is regulated by a number of factors, including high levels of ATP. Why is this enzyme regulated by ATP levels?
A. If ATP levels are high, this provides a mechanism to directly inhibit the Krebs cycle, thus preventing further generation of NADH, FADH2 and ATP molecules that are not needed. B. If ATP levels are high, it is important to directly inhibit the reaction that commits the substrate to glycolysis to allow the substrate to be available for other reactions, since the cell has ample energy. C. If ATP levels are high, it is important to inhibit ATP synthase, and phosphofructokinase directly inhibits ATP synthase. D. If ATP levels are high, this provides a mechanism to directly inhibit the electron transport chain, thus preventing the formation of a proton gradient in the intermembrane space of mitochondria.
Research of knockout mice with no active copies of the Dvl-1 gene can be used to study which of the
following in humans?
a. schizophrenia only b. obsessive compulsive disorder only c. Huntington disease only d. HIV e. schizophrenia, obsessive compulsive disorder, and Huntington disease
Of all organisms, prokaryotes are the ____.
A. smallest B. least abundant C. least metabolically diverse D. least widespread E. most internally complex
Which of the following best describes the mechanism by which chromatin-remodeling complexes "loosen" the DNA wrapped around the core histones?
(a) They use energy derived from ATP hydrolysis to change the relative position of the DNA and the core histone octamer. (b) They chemically modify the DNA, changing the affinity between the histone octamer and the DNA. (c) They remove histone H1 from the linker DNA adjacent to the core histone octamer. (d) They chemically modify core histones to alter the affinity between the histone octamer and the DNA.