Suppose you are culturing tobacco in a petri dish at a 10:1 ratio of auxin to cytokinin. To promote only
shoot development you would
a. increase the cytokinin ratio
b. increase the auxin ratio
c. reduce the auxin level significantly and increase the cytokinin level slightly
d. grow the tobacco in the dark
e. grow the tobacco in the light
A
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A newborn who is accidentally given a drug that destroys the thymus would most likely _____
A) lack class I major histocompatability (MHC) molecules on cell surfaces B) lack innate immunity C) be unable to genetically rearrange antigen receptors D) be unable to differentiate and mature T cells E) have a reduced number of B cells and be unable to form antibodies
The place where pollination occurs is the
a. stigma. b. micropyle. c. anther. d. receptacle. e. style.
If we continued to follow the cell lineage from question 4, then the DNA content at metaphase of meiosis II would be
A) 0.25x. B) 0.5x. C) x. D) 2x. E) 4x.
Which of the following is not an advantage of genetically engineered plants?
Select one: a. decreased yield b. herbicide resistance c. salt tolerance d. drought tolerance e. disease protection