During tryptophan synthesis in Escherichia coli, the 1:2 attenuator sequence of mRNA is called the pause loop.
Answer the following statement true (T) or false (F)
True
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Avery and colleagues purified a white substance as the transforming principle. Treating this substance with enzymes that destroyed RNA, protein, or polysaccharides did not affect its ability to transform cells, but enzyme that degrades DNA destroyed the transforming ability. These results suggested that
A) their transforming principle was not entirely pure. B) the transforming principle appeared to be DNA. C) the test for transformation was not accurate. D) a single gene could transform bacterial cells. E) both DNA and proteins are required for transformation.
The Cretaceous ended _____ million years ago
Fill in the blank(s) with correct word
Which of the following regarding the Spemann organizer is true? (Check all that apply.)
_____ Signaling molecules from the organizer inhibit ventral development. _____ The dorsal lip cells directly activate dorsal development. _____ The organizer determines the dorsal-ventral axis. _____ The organizer forms in the area of the grey crescent. _____ The point of sperm entry determines the orientation of the organizer.
All of the following are true about endotoxins EXCEPT:
A. The lipid A moiety in the LPS is responsible for the toxicity of the endotoxins B. The main pathologic effects of endotoxins are fever, shock, hypotension, and thrombosis a.k.a septic shock C. They are released into the host's circulation following bacterial cell analysis D. They are heat-stable lipopolysaccharide (LPS) component of the outer membranes of gram-positive bacteria