What diffuses across the narrow synaptic cleft between the presynaptic axon and the postsynaptic cell to transmit a nerve impulse?
A. neurotransmitter
B. electrical impulse
C. Na+ ion
D. vesicle
E. action potential
A. neurotransmitter
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What type of bonds form from the unequal sharing of electrons?
A. hydrogen. B. ionic. C. polar covalent. D. nonpolar covalent. E. electrostatic.
Amino acids in a polypeptide are part of
a. the primary structure. b. carbohydrates. c. lipids. d. nucleic acids. e. most macromolecules.
Which of the following countries have an age structure that most resembles a pyramid?
A) United States B) Japan C) Egypt D) none resemble a pyramid
Using biotechnology, plant breeders attempt to find and incorporate specific resistance genes into plants that lack them. Once a plant has been given a resistance gene, it will have indefinite protection from the associated pathogen.
Answer the following statement true (T) or false (F)