Why is reduction the term used to describe the gain of an electron?

a. The electron acceptor's net charge decreases.
b. The number of molecules in the reaction decreases.
c. The amount of energy in the molecule decreases.
d. The electron acceptor gets smaller.


Answer: a. The electron acceptor's net charge decreases.

Biology & Microbiology

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A microbiologist is working with two genera of bacteria, A and B, to determine if cells are competent. Strains are grown under optimal conditions, and DNA fragments that carry the gene for green fluorescent protein is added to each culture at 20-minute intervals. Samples from each treatment are plated to nutrient agar and incubated, after which the plates are examined under an ultraviolet lamp.  The microbiologist observes that all plates of bacteria B contain colonies that are fluorescent, while for bacteria A only the plates from stationary phase demonstrate fluorescent colonies. What can be concluded from these results?       

A. Competence in bacteria A is constitutively expressed. B. Competence in bacteria B is dependent on the phase of growth. C. Both bacteria A and bacteria B cells are competent. D. Neither bacteria A nor bacteria B cells are competent.

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Conjugation, transduction, and transformation are the three main mechanisms for gene transfer between bacteria. Compare these three mechanisms in terms of how DNA is transferred

What will be an ideal response?

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Adult stem cells can only differentiate into the cell types that comprise the tissues in which they are located

a. True b. False

Biology & Microbiology

The usual vector for human monocytotropic ehrlichiosis is the

a) sandfly. b) Lone Star tick. c) Aedesmosquito. d) Dermacentortick.

Biology & Microbiology