Which of the following is true about antigenic drift?
A. It causes major changes in the flu virus.
B. It causes minor changes in the flu virus.
C. It doesn't cause any changes in the flu virus.
D. None of the answers are correct.
E. It results in the genome reasserting.
Ans: B. It causes minor changes in the flu virus.
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Where are a mollusk’s gills located?
a. within the visceral mass b. under the foot c. in the mantle cavity d. surrounding the radula
In biological transmission, pathogens reproduce in the vector.
a. true b. false
The critical period is
A) the time during which a sperm can fertilize an oocyte. B) the time during which an embryo can implant in the uterine lining. C) the time during development when structures are sensitive to damage from a mutation, toxin, or virus. D) the labor period.
In rabbits, there are four alleles at the c locus
Arranged in dominance sequence they are:C (agouti), cch(chinchilla), ch(Himalayan), and c (albino) (a) Is it possible to cross two agouti rabbits and produce both chinchilla and Himalayan offspring? (b) Is it possible to cross two chinchillas and produce 1/2 chinchilla and 1/2 Himalayan? What will be an ideal response?