All cells have protein or saccharide markers called:
a. histamines
b. lymphocytes
c. antibodies
d. antigens
d. antigens
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Sieve plates:
A. are modified cell walls that connect sieve elements. B. do not contain plasmodesmata. C. dissolve at sieve tube maturity. D. have solid, impermeable surfaces. E. contain mitochondria and chloroplasts.
The first major divergence after the evolution of the first cells was the split between ________ and ________
a. prokaryotes / a common ancestor of archaeans and eukaryotes b. prokaryotes / eukaryotes c. archaeans / a common ancestor of prokaryotes and eukaryotes d. prokaryotes / archaeans
Restriction enzymes cut double-stranded DNA
a. between genes. b. at specific base sequences c. between bacterial and viral DNAs. d. between purines and pyrimidines. e. between promoter and operator DNA sequences.
The cancer drugs Gleevec and Herceptin bind to receptor ____________________ and stop the growth of cancer cells. Fill in the blank(s) with the appropriate word(s)