Ricin is toxic because
a. it binds to eukaryotic DNA.
b. it binds to eukaryotic mRNA.
c. it blocks food from entering the cell.
d. it inactivates ribosomes.
e. it binds to nerve tissue and causes paralysis
D
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Which of the following statements is
CORRECT?
a. A population cannot exceed the carrying capacity even temporarily. b. An organism can occupy more than one trophic level, depending upon the feeding habits of the organism. c. Once populations of organisms become isolated, they remain so by various types of isolation mechanisms. d. The limits of a population are all traced to climatic or physical factors. e. Organisms with different evolutionary backgrounds can occupy the same niche at the same time.
A glycoprotein is a combination of a protein and
a. heme. b. oligosaccharides. c. collagen. d. fatty acids. e. nucleic acids.
Name the general category into which double-stranded circular extrachromosomal DNA elements such as F factors, ColE1, and R would fall
A) capsid B) plasmid C) r-determinant D) plaque E) partial diploid
food moves down the esphagus under the influence of gravity alone.
a. true b. false