Which of the following cells engulf antigens and present fragments of them on their own surfaces for recognition?
a. plasma cells
b. T lymphocytes
c. NK cells
d. dendritic cells
Answer: d. dendritic cells
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Why is it so important that all of the chromosomes align on the metaphase plate during metaphase?
A. This is the only place in the cell where the cyclins and Cdks are located. B. If they cannot, it suggests that they aren't properly attached to the spindle microtubules, and thus won't separate properly during anaphase. C. This is the location where the chromosomes can become attached to the spindle microtubules. D. This allows asters to form. E. This allows sister chromatids to form.
Which chordate has a four-chambered heart, no bladder, no teeth, and lack of a penis in the males?
a. a bird b. a crocodile c. a bat d. a frog e. a shark
The source of blood for the glomerular capillaries is
indicated by a. A. b. B. c. C. d. D. e. E.
The only gene that has been positively identified with the onset of Alzheimer disease encodes a protein
that ___________________. A. is involved in cholesterol metabolism B. breaks down neurotransmitters C. maintains the health of striatum cells D. attaches amino acids to tRNA molecules E. breaks down fatty deposits around neurons