How are the gastric glands in the stomach protected from digestion by the enzyme they produce?
What will be an ideal response?
ANSWER: The chief cells in the gastric glands produce the inactive form of the enzyme called
pepsinogen. The pepsinogen does not become active, in the form of pepsin, until it by mucous cells, protects the mucosal layer of the stomach from attack by pepsin and HCl.
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When two traits are analyzed separately, then the frequencies of each are combined to yield the observed phenotypic ratios, this confirms the principle of ____________________
Fill in the blank(s) with correct word
Bacterial sexually transmitted diseases include all of the following except
A. gonorrhea. B. syphilis. C. chlamydia. D. herpes.
Ribbon worms (phylum Nemertea) primarily feed on sediment, as earthworms do
Indicate whether the statement is true or false
Which of the following is an example of the second law of thermodynamics?
a. Conversion of the energy in sunlight into glucose b. The use of gasoline to propel your car c. ATP activation of a proton pump. d. A light bulb heats up after use e. A nuclear reactor lights up the city.