Which of the following mechanisms helps prevent gastric juice from digesting the stomach lining?
A) mucus coating the inside surface of the stomach
B) contractions of the stomach constantly moving chyme into the small intestine
C) the continuous secretion of gastric juice
D) the inactivation of pepsin by hydrochloric acid
A
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The effects of elevated atmospheric CO2 concentrations
A. have the potential to alter the nutritional status of plants. B. have the potential to allow herbivores to eat less plant matter. C. have no effect on nutrient levels found in plant leaves. D. allow the plant to use O2 more efficiently in photosynthesis. E. cause an increase in rubisco production.
What structures in the cell membrane are responsible for moving substances across the membrane?
a. Recognition proteins b. Vacuoles c. Cholesterol d. Transport proteins e. Phospholipids
These two homologous chromosomes have ___ alleles in common and differ by ___ alleles
1.1, 3
2.2, 2
3.3, 1
4.4, 0
The half-life of a molecule is the time it takes for 50% of the molecule to be broken down and recycled.
Answer the following statement true (T) or false (F)