Which of the following choices is not a mechanism by which enzymes generally speed reactions?
a. orienting substrates in favorable positions
b. helping substrates get together
c. permanently donating a proton or electron to the reaction
d. inducing a fit between enzyme and substrate
c
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Hepatitis B virus
A. is transmitted to newborns from chronic carrier mothers. B. has many chronic carriers. C. is principally transmitted by blood. D. transmission risks include shared needles, anal intercourse, and heterosexual intercourse. E. All of the choices are correct.
Which of the following types of transport occur across the erythrocyte membrane?
A) O2 and CO2 passive diffusion B) aquaporin water transport C) Cl? bicarbonate ion antiport D) glucose uniport E) All of the above are correct.
Motor neurons release the neurotransmitter acetylcholine (ACh) and acetylcholinesterase degrades ACh in the synapse
If a neurophysiologist applies onchidal (a naturally occurring acetylcholinesterase inhibitor produced by the mollusc Onchidella binneyi) to a synapse, what would you expect to happen? A) paralysis of muscle tissue B) convulsions due to constant muscle stimulation C) decrease in the frequency of action potentials D) no effect
In cats, a fur color gene is on the X chromosome. At this locus, cats can have a black allele or an orange allele. Cats who are homozygous for the black allele have black fur, cats who are homozygous for the orange allele have orange fur, and cats who are heterozygous at this locus are tortoiseshell. What offspring would you expect from a cross between an orange female and a black male?
A. tortoiseshell females and orange males B. tortoiseshell females and black males C. orange females and black males D. black females and orange males E. tortoiseshell females and tortoiseshell males