Methyl alcohol, also known as wood alcohol, is a common solvent and paint remover. It is poisonous if accidentally swallowed. The enzyme alcohol dehydrogenase in the liver converts methyl alcohol into formaldehyde, which then gets converted into a toxic
product. Grain alcohol, ethyl alcohol, is also acted upon by alcohol dehydrogenase. One antidote for methyl alcohol poisoning is to make a person drink a lot of ethyl alcohol. This blocks the active site of the enzyme so that it can't bind to and break down the methyl alcohol. In this capacity, the ethyl alcohol is acting as a/an:
A) competitive inhibtor. B) precursor.
C) coenzyme. D) allosteric regulator.
Answer: A
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Indicate whether the statement is true or false.
Which forms of nitrogen are readily usable by plants?
a. NH4 + and NO3 ? b. NH4 + and NO2 ? c. N2 and NH3 d. NH4 and NH3 e. NO3 ? and NO4 ?
Which of the following parts of an amino acid vary among different amino acids?
A. the carboxyl group B. the side chain, or R group C. the amino group D. the hydrogen on the central carbon
Individual B cells produce
A) several different types of antibodies. B) the antibodies specified by its constant region gene. C) their own unique antibody. D) an infinite diversity of antibodies.