In alcoholic fermentation, the electrons and hydrogen are transferred from NADH to acetaldehyde, forming:
a. pyruvate
b. carbon dioxide
c. ethanol only
d. NAD+ and ethanol
e. lactate
d
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Integration of linear transforming DNA into the chromosome
A) is not required for the expression for the transformed genes. B) is catalyzed by the RecA gene. C) almost never occurs because restriction endonuclease will degrade the DNA before it is integrated. D) only occurs in laboratory-based systems in artificial competent cells.
Positive cooperativity would most likely be observed when a protein is:
A. a single polypeptide with a Kd = 10-10. B. a single polypeptide with three ligand-binding sites of increasing Kd values. C. comprised of two identical subunits, each of which binds ligand. D. comprised of two ligand-binding sites where the Kd for the second site decreases after the first ligand binds. E. comprised of subunits A and B, where ligand binding to A facilitates ligand binding to B.
Phorid flies are being used to combat the invasive red imported fire ants. How do phorid flies kill the ants?
a. They are predators of the ants. b. They produce a poison in their lining which kills the ants when eaten. c. They are parasitoids who lay their eggs in the ants body. d. They compete with the ants for food sources. e. They kill ant eggs.
Healing by first intention is also called
What will be an ideal response?