Some of the bacteria found in the human digestive system help us to break down and digest food. In return, the bacteria obtain food and nutrients. This type of relationship is known as...
a) parasitism
b) commensalism
c) coexistence
d) mutualism
Ans: d) mutualism
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Free-floating, photosynthetic organisms found in marine environments are
A. Bucella. B. blue-green algae. C. krill. D. phytoplankton.
All of the following are techniques associated with biotechnology EXCEPT
a. GMOs. b. identifying genetic markers. c. therapeutic cloning. d. gene therapy
What type of molecule comprises the sensory receptors on the cilia of olfactory neurons?
a. carbohydrates b. lipids c. proteins d. nucleic acids
During the course of evolution, one of the main threats to human survival was ____________. Persons who stood the best chance of survival were those __________.
(a) extreme cold; who were heavier and had a protective layer of body fat (b) the presence of vegetation that was toxic if eaten; who ate only meat (c) inconsistent food supplies; who preferred high-calorie foods (d) animal predators; who were lean and could ambulate quickly