What is the oxidized form of the most common electron carrier that is needed for both glycolysis and the Krebs cycle?  

A.  ATP
B.  FAD
C.  pyruvate
D.  NAD+
E.  acetyl-CoA


D.  NAD+

Biology & Microbiology

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Chemical signals that are released by one cell and act locally on neighboring cells are referred to as:

A. paracrine signals. B. autocrine signals. C. hormones. D. pheromones. E. neurotransmitters.

Biology & Microbiology

In the figure above, the amount of energy symbolized by the line "A" would be the ____

a. reactant energy b. product energy c. cofactor energy d. activation energy e. intermediate energy

Biology & Microbiology

Short segments of newly synthesized DNA are joined into a continuous strand by _____.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Researchers testing new drugs usually give the drug to one group of people and give placebos, "sugar pills," to another group. The group receiving the placebo ________

A) is the control group B) constitutes the experimental group C) is needed so that the test will be repeated enough times D) is a backup in case some of the people getting the drug drop out of the test

Biology & Microbiology