Chief cells secrete:a
trypsin.
b. bile.
c. pepsin.
d. pepsinogen.
e. hydrochloric acid
d
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Crossing over is important because it
1.eliminates a bad allele from being in an egg or sperm cell. 2.increases the variation in the DNA of eggs and sperm. 3.increases the number of alleles in the eggs and sperm. 4.changes the alleles for traits on a chromosome.
The trend in which organisms come to have characteristics that suit them to conditions in a particular
environment is called a. genetic drift. b. adaptation. c. mutation. d. isolation. e. divergence.
Cellular respiration requires fuel (glucose) and oxygen gas. The main process that produces these inputs is _____.
A. photosynthesis B. glycolysis C. electron transport D. the citric acid cycle
Why is baker's yeast useful for expressing genetically engineered genes?
a. The yeast cells are best suited for making human products for medical use. b. Yeast cells are eukaryotic and so would likely be successful in expressing eukaryotic genes. c. Many inducible promoters from the yeast genome have been cloned, such as the lac operon. d. The yeast cells do not secrete their protein products.