Which of the following describes a deciduous conifer?
a. It drops all its leaves at once in autumn.
b. It is pollinated by both beetles and birds.
c. It grows new pine cones every six months.
d. It has flowers that go dormant in winter.
a. It drops all its leaves at once in autumn.
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Complete reproductive isolation is evidence that what has occurred?
a. extinction b. speciation c. polyploidy d. hybridization e. gene flow
In a gene sequence, the DNA codon for tryptophan experiences a mutation at the first base position, changing it to T. What will the resulting amino acid be?
A) Tryptophan (no change) B) Serine C) Arginine D) Threonine E) None (a stop codon will halt translation)
Which one of the following diseases is not correctly matched to its reservoir?
a. influenza— animal b. rabies—animal c. botulism—nonliving d. anthrax—nonliving e. toxoplasmosis—cats
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.