Sphynx cats have a mutation in a(n)_____ of the keratin gene, which prevents necessary splicing; therefore, keratin
protein fibers do not assemble properly.
a. promoter
b. intron-exon splice site
c. exon
d. stop codon
e. enhancer
ANSWER: b
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Which of the following types of cellular activities can be a response to cell signaling?
A. Cell division is triggered. B. Gene expression patterns are changed. C. Enzyme activity patterns are changed. D. Cell signals are released to communicate with other cells. E. All of these choices are correct.
If a cell has a 95% concentration of water in its cytoplasm and the environment surrounding the cell has a 90% concentration of water, water will flow
A. into the cell by osmosis. B. out of the cell by active transport. C. out of the cell by osmosis. D. into the cell by active transport. E. into the cell by facilitated diffusion.
Some animals have no body symmetry or have
__________ symmetry like a wheel. Fill in the blank(s) with the appropriate word(s).
Chromosomal islands have which of the following properties?
a. may be responsible for differences between strains of the same species b. may be flanked by inverted repeats c. may contain virulence factors d. all of the above