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
a
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What removes nitrogen from the atmosphere?
a. denitrification b. nitrification c. mineralization d. nitrogen fixation e. assimilation
Which of the following statements is false?
a. About 300 species of turtles currently exist. b. Turtles do not have teeth. c. Turtle shells are enlarged in marine forms. d. Turtles must return to land to lay eggs. e. Most sea turtle species are highly endangered
Since viruses have no active methods of entering plant cells, they must rely upon mechanically caused wounds, vegetative propagation of plants, grafting, seed, pollen, and being carried on the mouth parts of chewing insects. Tobacco mosaic virus is most commonly introduced into plants through small wounds caused by handling and by insects chewing on plant parts. What would prevent viruses from easily entering plant cells?
a. The cell wall on the virus b. The plasma membrane on the plant c. The cell wall on the plant d. The plasma membrane on the virus e. The protein coat on the virus
A particular virus is known to attack the immune system of humans and continues to infect people no matter how many vaccines are developed against it. What can you predict about the genome of this virus?
a) This viral genome is composed of RNA. b) This viral genome is very small compared to other viruses. c) This viral genome mutates at a rapid rate. d) All of the above. e) Nothing can be predicted about this viral genome with the given information.