Lymphocytes
A) are produced only upon demand.
B) are an abnormal finding in blood.
C) are responsible for specific immunity.
D) make up 50—60 percent of the white blood cell population.
E) are slightly smaller than red blood cells.
C) are responsible for specific immunity.
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In cells that are not dividing, chromosomes uncoil to form a tangle of fine fibers known as
A) histones. B) histiocytes. C) chromatin. D) chromaffin. E) genes.
Puffer fish poison blocks voltage-gated sodium channels like a cork. What effect would this neurotoxin have on the function of neurons?
A) Neurons would depolarize more rapidly. B) Action potentials would lack a repolarization phase. C) The absolute refractory period would be shorter than normal. D) The axon would be unable to generate action potentials. E) None, because the chemically gated sodium channels would still function.
In a myelinated axon, the greatest concentration of voltage-gated ion channels is in the
A. myelinated regions. B. neurofibril nodes.
Which of the following selections includes ONLY essential amino acids for a growing child?
a. valine, tyrosine, leucine, serine, alanine b. aspartic acid, glutamic acid, tyrosine, glycine, alanine c. proline, serine, cysteine, glutamine, histidine d. leucine, lysine, valine, tryptophan, arginine