Antigen receptors are capable of producing large
diversity due to the fact that there are __________
cassettes (versions) of each __________. Fill in the blank(s) with the appropriate word(s).
Answer: multiple; gene
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A student prepares lysate A from cells with high levels of cAMP and lysate B from cells with very low levels of cAMP. If these lysates were subjected to DNase, it could be predicted that cAMP receptor protein binding sites would be:
A. not present in either lysate. B. protected in lysate A. C. protected in lysate B. D. equally protected in both lysates. E. not occupied in either lysate.
Which statement about the megasporocyte is true?
a. It undergoes meiosis to produce three haploid cells. b. It is a diploid cell located within an ovule. c. It divides mitotically to form a male gametophyte. d. It plays an important role in cross-pollination. e. It will give rise to the generative cell.
Peptidoglycan is a polysaccharide found only in bacteria.
a. true b. false
According to the animation, B cells interact directly with
a. phagocytes. b. inflammation. c. the complement system. d. helper T cells.