What is the function of a normal MAOA protein?
a. It breaks down neurotransmitters in the synapse
b. It carries neurotransmitters across synapses.
c. It is a neurotransmitter.
d. It is an enzyme essential in the formation of certain neurotransmitters.
e. It is an enzyme responsible for the construction of neurotransmitter receptors.
a
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All photoreceptors ________
a. are found in eyes b. convert photon energy to visual images c. are found in vertebrates d. convert photon energy to sensory neuron excitation
The first amino acid in a growing polypeptide chain is _____
a. methionine b. valine c. lysine d. phenylalanine e. glycine
D 27. The rate of diffusion through a selectively permeable membrane will be lowest when which of the following is(are) true?
I. Concentration gradients are steep. II. Temperatures are low. III. Solutes are small molecules. a. I only b. II only c. I and III d. II and III e. I, II, and III
In what way are eyes and eyespots similar to each other?
a. They are both simple. b. They both sense light. c. They are both big. d. They both sense the absence of light.