Which of the following functions as a biological catalyst?
A) Energy-carrier molecule
B) Substrate
C) Enzyme
D) Amino acid
E) Steroid
C
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Their next two steps, in order, should be _____
A) use of a fluorescent probe for the gene sequence, then electrophoresis B) electrophoresis of the fragments followed by autoradiography C) electrophoresis of the fragments, followed by the use of a probe D) use of a ligase that will anneal the pieces, followed by Southern blotting E) use of reverse transcriptase to make cDNA, followed by electrophoresis
________ are associated with the "pinching in" of the cell membrane during cytokinesis.
Fill in the blank(s) with the appropriate word(s).
Some archaeal cells lack a cell wall.
Answer the following statement true (T) or false (F)
Only mammals and birds can produce urine that is
A. hypertonic. B. isotonic. C. hypotonic.