How does a person distinguish flavors? What will be an ideal response? What will be an ideal response?
Concepts to Consider: It depends on the combinations of the four basic tastes: sweet, sour, salty,
bitter, and a fifth--glutamate. Taste is also affected by smell, texture, and temperature. Olfaction
affects flavor since odors pass from the mouth to the nasal cavity through internal nares. These tastes
activate the signal transduction process that involves a G protein and the second messenger, cyclic
AMP.
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Which type of chemical linkage is the weakest?
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
The main regulator of calcium blood levels is
a. the parathyroid glands. b. the thyroid glands. c. the hypothalamus. d. the anterior pituitary gland. e. the posterior pituitary gland
Which plants store CO2 in the form of malic acid and close their stomata during the day?
A) C3 plants B) C4 plants C) CAM plants D) hornworts and liverworts
When and where did the first multicellular protists evolve?
A. Canada, 1.4 BYA B. Middle East, 4.6 BYA C. Africa, 2.3 BYA D. Asia, 3.2 BYA