What is one function of the pyloric sphincter?
a. Prevents esophageal contents from emptying too quickly into the stomach
b. Prevents stomach contents from backing up into the esophagus
c. Prevents intestinal contents from backing up into the stomach
d. Prevents intestinal contents from emptying too quickly into the colon
c. Prevents intestinal contents from backing up into the stomach
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Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as:
A. an atomic model. B. valance electrons. C. the periodic table. D. the octet rule.
The similarity between the bodies of sharks and dolphins is an example of convergent evolution. Indicate whether the statement is true or false
Which of the following statements is not true concerning root hairs?
a. They are tubular extensions of epidermal cells. b. They are continually formed in the area of cell maturation. c. They are quite numerous. d. They greatly increase the absorptive capacity of roots. e. They are long lived .
Which of the following is responsible for the alpha-helical structure of proteins?
a. hydrogen bonds b. ionic interactions c. polar covalent bonds d. hydrophobic interactions e. nonpolar covalent bonds