In the knee-jerk reflex arc, the synapse between a
sensory neuron and a motor neuron occurs
a. in the brain.
b. between the receptor and the spinal cord.
c. within the muscle of the leg.
d. within the spinal cord.
e. in the nerve leading to the spinal cord.
Answer: d
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Prokaryotic DNA replication occurs at a rate of
A. 750-1,000 base pairs per second. B. 50-100 base pairs per minute. C. 750-1,000 base pairs per minute. D. 50-100 base pairs per second.
How do lipid insoluble hormones affect targets within the cell?
a. They bind to channel proteins for transport into the cell. b. They hydrolyze receptors for lipid soluble hormones, blocking their action. c. They trigger the release of a second messenger in the cytoplasm. d. Lipid insoluble hormones are synthesized and remain inside the cell.
Which phylogenetic model proposes that the first eukaryotes originated from a pool of many species of prokaryotes engaged in multiple methods of horizontal gene transfer?
a. tree of life b. ring of life c. web of life d. cloud of life
The ciliary muscle
a. controls the eardrum. b. controls the shape of the lens to allow focusing. c. holds the bones of the middle ear in place. d. enables the eyeball to move so that a person may see an object without moving the head. e. is responsible for the size of the pupil in different light intensities.