A constitutive gene is a gene that is occasionally expressed
Indicate whether the statement is true or false
FALSE
Explanation: By definition, a constitutive gene is continually expressed.
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Once activated, cAMP is quickly degraded to AMP by ____ which results in switching off the signal
pathway.
a. adenylyl cyclase b. diacylglycerol (DAG) c. phospholipase C d. acetylcholinesterase e. phosphodiesterase
A milkweed plant discourages consumption by herbivores by
a. exuding a toxic sap. b. developing an appearance that mimics an undesirable plant. c. having hairy leaves. d. producing an undesirable scent. e. having thorns.
How does Viagra enhance erectile function of the penis?
a) by preventing cGMP production b) by inhibiting guanylyl cyclase activity c) by inhibiting cGMP phosphatase d) by inhibiting nitric oxide release e) by inhibiting cGMP phosphodiesterase
Parasitic lampreys have
A) bony jaws. B) radial proportions. C) sucker-like mouths lined with teeth. D) a three-chambered heart. E) internal fertilization.