A channel that opens in response to the binding of a specific molecule, which is usually NOT the solute that passes through the channel is called a(n)_____.
a) positive-gated channel
b) ligand-gate channel
c) voltage-gated channel
d) electric-gated channel
e) charge-gated channel
Ans: b) ligand-gate channel
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How does gibberellic acid affect stem length in pea plants?
a. Plants with normal stem length have higher levels of gibberellic acid. b. Plants with short stem length have higher levels of gibberellic acid. c. Plants with normal stem length have the dominant allele Le that encodes an enzyme to degrade gibberellic acid. d. Plants with short stem length have the dominant allele Le that encodes an enzyme to degrade gibberellic acid. e. Plants with short stem length are homozygous recessive for the allele le that encodes an enzyme to degrade gibberellic acid.
What sequence of events leads to the perception of a visual scene?
I. In response to light, retinal dissociates from rod and cone photopigments, hyperpolarizing the photoreceptor cells and leading to activation of bipolar neurons. II. Action potentials are propagated through ganglion cells, whose axons project to the occipital lobe of the brain. III. In response to light, rod and cone photoreceptors depolarize, causing increased release of neurotransmitter and activation of bipolar neurons. A. I then III B. III then II C. III then I then II D. I then II then III E. I then II
Euglenozoans have distinctive _____
Fill in the blank(s) with the appropriate word(s).
The pH indicator(s) in the Eosin Methylene Blue Agar is (are)
A. Neutral red B. Eosin Y & methylene blue C. Phenol red D. Methyl red E. Bile salts & brilliant green