Which mechanism have viroids evolved to stay stable outside host cells?
a. forming a hairpin-shaped double-stranded molecule with closed ends outside cells
b. forming a protein capsid outside cells
c. forming a protective polysaccharide sheath outside cells
d. all of the above
Answer: A
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A. epithelial B. connective C. muscle D. nervous E. All of the answer choices are correct.
HIV can be transmitted by
a. unprotected sex. b. sharing needles. c. mother to infant during pregnancy. d. mother to infant during breast feeding. e. all of these
Which cells of the pancreas produce glucagon?
a. alpha cells b. beta cells c. delta cells d. F cells e. gamma cells
During which phase of mitosis does the nuclear envelope re-form?
A) anaphase B) metaphase C) prophase D) telophase