The vaccine for immunity to Haemophilus influenzae serotype b is ________.
A. DTaP
B. Pneumovax
C. Hib
D. MMR
Answer: C
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A man inherited a chromosome with a deletion that removes a tumor-suppressor gene. The protein encoded by this gene normally functions in DNA damage repair. Which series of events would be most likely to lead to cancer?
A) Loss-of-heterozygosity of the tumor-suppressor gene followed by driver mutations in two different proto-oncogenes B) A loss-of-function mutation in a proto-oncogene followed by a gain-of function mutation in a tumor-suppressor gene C) Loss-of-heterozygosity of the tumor-suppressor gene followed by passenger mutations in several genes of unknown function D) A gain-of-function mutation in a proto-oncogene followed by a chromosomal duplication of a region including a tumor-suppressor gene that functions the G1-to-S checkpoint
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
Pairs of maternal and paternal chromosomes line up between the two spindle poles during _______________.
A. metaphase I B. telophase I C. prophase II D. metaphase II E. anaphase II
Gene that codes for a protein that ordinarily suppresses the cell cycle; inactivity due to a mutation can lead to a tumor.
What will be an ideal response?