Extracts of pathogenic bacteria can transform
harmless bacteria to harmful bacteria unless
____ enzymes are added to the extract.
a. protein-digesting
b. mRNA-digesting
c. tRNA-digesting
d. DNA-digesting
e. any of these
D
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Describe the colonial theory of animal origins
What will be an ideal response?
Which of the following statements is false?
A) There are more than 60 different kinds of amino acids present in cells. B) The R group of amino acids differs from one amino acid to another. C) Only around 20 amino acids are used in protein synthesis. D) Equal amounts of D- and L-amino acids are found in cells. E) An amino acid has an N-terminus, a C-terminus, and an R group.
Why is the Citric Acid cycle called a cycle?
a. Glucose is cycled around and resynthesized. b. Carbon dioxide is cycled back to photosynthesis. c. NAD+ and FAD are recycled. d. The two-carbon acetic acid binds to a four-carbon molecule that is restored at the end of the cycle to be used again in the Citric Acid cycle. e. NADH is cycled down the electron transport chain.
Which is mismatched?
A. Scavengers - feed on live to dead cells and wastes B. Competition - one organism gives off substances that inhibit or kill other organisms C. Predator - seeks out and ingests live prey D. Parasitism - one organism benefits and the other receives no benefit E. Omnivores - feed on plants and flesh