The reaction of ethanol fermentation is: pyruvate + NADH ? ethanol + CO2 + NAD+. Why would a yeast need to perform this reaction in the absence of oxygen?
A. To produce CO2 for respiration.
B. To produce NAD+ allowing glycolysis to continue.
C. NADH is necessary to reduce pyruvate to lactate.
D. To produce NAD+ allowing the electron transport chain to run.
E. To consume excess pyruvate that cannot enter the Krebs cycle.
B. To produce NAD+ allowing glycolysis to continue.
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As a consequence of the immune system in humans recognizing dsRNA as foreign,
A) dsRNA viruses rarely infect humans. B) dsRNA viruses quickly transcribe their genes into mRNA which is insensitive to immune responses. C) genomes of RNA viruses are often chemically modified to avoid recognition by human immune cells. D) the genomes of dsRNA viruses must avoid human immune cells during infection, including replicating their genomes within their own nucleocapsids.
In some plants, the direction of growth changes in response to contact with an object. This is called __________. Fill in the blank(s) with the appropriate word(s)
Which one of the following is not among the four most abundant elements in living organisms?
A) Carbon B) Hydrogen C) Nitrogen D) Oxygen E) Phosphorus
characterizations of the gallbladder
What will be an ideal response?