Which of the following is incorrect about turgor pressure?
A. It occurs in an organism with cell walls when placed into a hypertonic environment.
B. It is necessary to keep plants from wilting.
C. It is the force of water against the inside of the cell wall.
D. It is maintained by osmosis.
E. It occurs in an organism with cell walls when placed into a hypotonic environment.
Answer: A. It occurs in an organism with cell walls when placed into a hypertonic environment.
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Type III hypersensitivity conditions such as arthritis involve
A. the formation of immune complexes. B. delayed, cell-mediated immune reactions. C. a cytotoxic reaction. D. the activation of mast cells. E. All of the choices are correct.
Mast cells are typically located where?
a. epithelial and muscle tissue b. mucosal and muscle tissue c. connective and mucosal tissues d. connective and muscle tissue
If adenine bonds with guanine, and thymine bonds with cytosine, the DNA molecule would
a. be constricted along its entire length. b. bulge where cytosine bonds with thymine. c. constrict where adenine bonds with guanine. d. partially constrict and partially bulge along its length. e. be highly reactive.
Although 61 different codons code for amino acids, cells contain fewer than 61 different tRNAs. Why?
A. Although 61 different codons code for amino acids, any given cell contains fewer than 61. B. Because the 5' base on the mRNA codon has some flexibility (wobble); thus, some mRNA codons can pair with more than one tRNA anticodon. C. Because the 5' base on the tRNA anticodon has some flexibility (wobble); thus, some tRNA anticodons can pair with more than one mRNA codon. D. Because each amino acid is coded for by just one codon.