At a synapse,
A. synaptic vesicles fuse with the pre-synaptic membrane and neurotransmitters diffuse across the synaptic cleft.
B. synaptic vesicles fuse with the postsynaptic membrane.
C. synaptic vesicles fuse with the pre-synaptic membrane.
D. neurotransmitters diffuse across the synaptic cleft.
E. neurotransmitters are actively transported across the synaptic cleft.
Answer: A
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A scientist is investigating a hormone response in rose bush stems by removing the apical meristems of the main stems. What is the most likely result of this experiment and what hormone is responsible?
A. New apical buds will develop under the influence of auxin. B. Larger, deeper roots will form under the influence of cytokinin. C. More leaf buds will appear along the main stems under the influence of auxin. D. Flowers will turn yellow and fall off under the influence of auxin. E. Lateral buds will develop under the influence of cytokinin.
Immunological memory results from the production of
A. memory B cells and memory cytotoxic T cells. B. mast cells and memory B cells. C. memory mast cells. D. memory B cells. E. memory cytotoxic T cells.
A heavy load of parasites is termed a(n) ________
Fill in the blank(s) with correct word
One method for detecting tumors in body tissue involves the use of radioactive materials to create three-dimensional images showing metabolic activity of a specific tissue. This technique is referred to as
A) magnetic resonance imaging. B) positron-emission tomography. C) mammography. D) electrophoresis. E) photodynamic therapy.