Which of the following substances could be a cofactor?
A) a protein
B) a polypeptide
C) a zinc atom
D) a ribosome
Answer: C
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The cell walls of plant cells and prokaryotic cells are structurally identical
a. true b. false
If genes are introduced into a yeast plasmid to serve as a shuttle vector, the plasmid has the ability to __________
A) move genes from human to yeast B) replicate in yeast or in bacteria C) degrade selected yeast genes D) recombine with yeast nuclear genes E) degrade other yeast plasmids
The impulse that signals each heartbeat is conducted along which path?
1) atrioventricular node 2) bundle branches 3) sinoatrial node 4) atrioventricular bundle a. 1 ? 2 ? 3 ? 4 b. 1 ? 3 ? 4 ? 2 c. 3 ? 1 ? 4 ? 2 d. 3 ? 4 ? 2 ? 1 e. 4 ? 1 ? 2 ? 3
Who is credited with first providing conclusive evidence of species extinction?
A) Alfred Russel Wallace B) Charles Lyell C) Georges Cuvier