Which of the following is an example of a commensal relationship?
a. A bird nesting in a tree
b. A tapeworm living in a human
c. A bee getting nectar from a flower
d. Protozoa living inside termites
a. A bird nesting in a tree
A bird nesting in a tree is an example of a commensal relationship.
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Although miRNAs and siRNAs share many similarities, including their incorporation into the RISC complex,
they differ in that with siRNA the single-stranded sequence that binds to targeted mRNAs results in cleavage of the mRNA and more rapid degradation by nucleases. A. true B. false
A competitive inhibitor
A) binds at a site other than the active site. B) irreversibly binds and inactivates the enzyme. C) cannot be processed by the enzyme. D) does not inhibit enzyme activity but does lower substrate concentration. E) binds to and inactivates the substrate.
If a mammal suffered damage to the temperature sensor in its brain, what would be the result?
A. The animal would fall back onto a more primitive ectothermic mode of regulation. B. Only the integumentary system is required to sense temperature changes. Body temperature would remain stable. C. The animal would have to rely on shivering instead of vasoconstriction to maintain body heat. D. The integrating center would not receive inputs to compare to the set point. Body temperature could rise or fall to dangerous levels.
Most adult insects have three major body parts or sections. They are the
A) head, body, and legs. B) head, thorax, and abdomen. C) antennae, head, and abdomen. D) legs, wings, and body.