Which of the following best explains why "carbs" (carbohydrates) are advertised by manufacturers of candy bars and sports drinks as a "quick energy boost"?
A) The energy in them can be stored as fat, which has high energy per unit weight.
B) The carbons in carbohydrates are rich in energy because they are highly oxidized.
C) Carbohydrates are reduced molecules that have high-energy electrons.
D) This is an advertising gimmick that has no scientific evidence to support it.
Answer: C
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The amniotic egg of reptiles, birds, and mammals is an adaptation to
(a) thwart carnivorous predators. (b) allow life on land. (c) compensate for the short period of development of the young. (d) protect the young from the nitrogenous wastes of the mother during embryonic development.
How is it that humans can perceive multiple sounds at once?
a. Each portion of the basilar membrane vibrates at a unique frequency, and multiple regions can be stimulated at the same time. b. The more frequencies of sounds that are present, the further the sound travels into the cochlea. c. We have two ears, each perceiving a subset of frequencies in the environment. d. The fluid in the middle ear can transmit multiple frequencies to the oval window. e. Sounds reaching the left or right ear result in different nerve impulses.
Two pairs of electrons shared between two atoms is
called __________. Fill in the blank(s) with the appropriate word(s).
The cell junction labeled “C” in the figure
a. prevents movement of materials between cells. b. is found in tissues subjected to stretching. c. anchors cells to each other and to the intracellular matrix. d. is found abundantly in surface epithelia. e. is found in most tissues except heart muscle.