Scientists study microorganisms on Earth today to search for life forms elsewhere, as well as to explore the origins of life on Earth. These microorganisms that are studied are referred to as:
A. extirpated.
B. extant.
C. existing.
D. extinct.
Answer: B
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When collagen is hydrolyzed it forms gelatin, the main ingredient of a jiggly dessert adored by children. What parts of a cow provide a rich source of collagen?
A. Brain B. Glandular organs C. Skin, tendons, and cartilage D. Heart and other muscles
Coenzyme Q:
a. transfers electrons. b. oxidizes glucose. c. is the ultimate source of energy in the citric acid cycle. d. transfers phosphate to ATP. e. reduces glucose.
The largest and most continuous region of tropical rain forest in the world is in South America
Indicate whether the statement is true or false
Which of the following is NOT an example of symbiosis?
A. bacteria in the human colon B. tapeworm in the human intestine C. tuberculosis in the human lung D. protozoa in termites E. microbes crossing the placenta to the fetus