The extinction of the dinosaurs is thought to be due to a massive meteorite impact
Indicate whether the statement is true or false
TRUE
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A chromosome consists of
A) mostly protein and RNA with a small amount of DNA. B) mostly DNA and proteins with a small amount of RNA. C) about equal proportions of DNA, RNA, and protein. D) DNA only.
Water flows upward in some xylem tubes and downward in others
Indicate whether the statement is true or false
Cladograms will group birds with reptiles because these groups share
A. many similar characteristics. B. derived characteristics. C. a common ancestor. D. All of the options are correct.
How is the trp repressor different from the lac repressor?
a. The trp repressor binds to an operator that is in a different position relative to the promoter than that of the lac repressor. b. The trp repressor recognizes operators of three different sets of genes. c. The trp repressor is synthesized in an inactive form. d. The trp repressor is autoregulated. e. All of the above.