When a plant encounters stressful hot and dry conditions, the
A. stomata close, and depending on the plant, will decrease or increase gas exchange.
B. stomata close, increasing gas exchange.
C. stomata open, decreasing gas exchange.
D. stomata open, increasing gas exchange.
E. stomata close, decreasing gas exchange.
E. stomata close, decreasing gas exchange.
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The study of DNA sequences indicates that the evolution of new functions for proteins typically occurs ________.
a. after gene duplication b. after genetic drift c. before gene duplication d. during gene flow
As food is chemically digested by the stomach, the pH of the gut fluids becomes very acidic. However, when the chyme is further processed in the small intestine, the gut fluid pH cannot remain that acidic
Explain the physiological processes that occur to chyme as it enters the duodenum to ensure that the pH is not damaging to the small intestine.
Some autosomal dominant diseases do not run in the family because they are lethal before the affected individual can __________.
Fill in the blank(s) with the appropriate word(s).
The protective layer outside of the plasma membrane of the plant cell is called
A. chitin B. the cell wall C. pectin D. proteoglycans E. cellulose