Foraging bees communicate with other bees in a waggle dance to give information about the food. The important cue in the dance that conveys information about the required flight direction to the food source relative to the hive-sun direction is the
A. angle between the waggle run in reference to the hive-sun angle.
B. angle between the waggle run in reference to the direction north from the hive.
C. angle between the waggle run and the vertical axis within the hive.
D. angle between the food source and the hive in reference to the sun.
E. speed of the waggle dance.
Answer: C
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A dental student wants to test if fluoride is an effective additive against tooth decay. The student studies tooth decay in a population of people who live in neighborhoods supplied with fluoridated water. This student would like to ask whether access to fluoridated water prevents tooth decay. What would be an effective control group to ask this question?
A. Individuals who have fluoride added to their toothpaste but not their water. B. Individuals with access to water with no fluoride added. C. Individuals with access to differing amounts of fluoride in the water. D. Individuals with access to fluoridated water.
The kingdom that includes mushrooms and yeasts is the ________.
Fill in the blank(s) with the appropriate word(s).
Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient
A) energy and transport proteins; down B) transport proteins; down C) energy and transport proteins; against D) transport proteins; against
Decompression sickness ("the bends") is caused by
a. a rapid rise of carbon dioxide in the blood.
b. lack of oxygen in the tissues.
c. bubbles of nitrogen in the blood.
d. glucose deficiency.
e. descending too rapidly into deep water.