When the two gametes that fuse to form a zygote contain different alleles of a given gene, the offspring is
A) abnormal.
B) heterozygous.
C) a new species.
D) homozygous.
E) haploid.
B
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Hyperpolarization of the postsynaptic nerve terminal
A) decreases the chance that an action potential will be initiated. B) increases the chance that an action potential will be initiated. C) does not affect the initiation of an action potential. D) is stimulated by an influx of calcium ions. E) none of the above
What are the key characteristics of arthropods?
A. Fused bodies, no exoskeleton, and jointed appendages B. Segmented bodies, tough exoskeleton, and jointed appendages C. Segmented bodies, no exoskeleton, and jointed appendages D. Fused bodies, tough exoskeleton, and jointed appendages
A deterioration in the myelin sheaths of motor axons to the lower leg would be expected to
a. remove the restraints to ion movement and speed up impulse transmission. b. cause immobility of the leg due to cessation of impulses to leg muscles. c. slow the rate of transmission and cause lack of motor control. d. have little effect because the sheaths are for insulation only. e. cause paralysis.
The growth hormone is called
a. prolactin. b. adrenalin. c. thyroxine. d. ACTH. e. somatotropin.