A receptor on the cell surface usually has several domains. The function of the external domain is:
a. transmitting the signal to the inside of the cell.
b. holding the receptor within the membrane.
c. attaching the receptor to the DNA.
d. functioning as an enzyme.
e. binding the signaling molecule.
E
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Chemical defenses that some plant species employ to deter germination and growth of other plants are examples of:
a. exploitative competition b. interference competition c. competitive exclusion d. character displacement e. resource partitioning
When an electron returns to its ground state, energy will be released as heat or an emission of light of a longer
wavelength known as: a. fluorescence. b. UV radiation. c. action spectrum. d. photoelectron hydrolysis. e. photoelectron degradation
The macrolide erythromycin works by
A) Inhibiting the binding of aminoacyl-tRNA molecules to the A site of ribosomes B) Binding to the small ribosomal subunit to interfere with protein synthesis C) Inhibiting peptide chain elongation during protein synthesis D) Inhibiting the peptidyl transferase reaction
A pseudocoelom is a cavity that develops into the coelom during embryonic development.
Answer the following statement true (T) or false (F)