To sterilize heat-sensitive solutions such as special culture media, enzymes, and vaccines, one should use
A. dry heat.
B. an autoclave.
C. filtration.
D. pasteurization.
Ans: C. filtration.
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In a _______ translocation, two non homologous chromosomes exchange parts and no genetic information is gained or lost from the cell in exchange.
Fill in the blank(s) with the appropriate word(s).
A similarity between regulation of the lac operon in bacteria and the regulation of galactose utilization in yeast is that both pathways
A) transcribe all the genes necessary as one polycistronic mRNA. B) use feedback inhibition to stop making their sugars. C) use a modified version of their sugars as inducers. D) are subject to catabolite repression. E) C and D only
Which type of amino acids cannot be synthesized by the body?
What will be an ideal response?
How does a ribbon worm differ from a flatworm?
A. A flatworm has a complete digestive system. B. Flatworms are deuterostomes. C. Flatworms are radially symmetrical and ribbon worms are bilaterally symmetrical. D. A ribbon worm has a mouth and an anus.