A large reserve of methane is found in a pocket below the ocean floor and isotope analysis revealed that the 13C/12C ratio is lower than that predicted by the natural occurrence of these isotopes. This finding suggests that the methane was produced by ________.
A. oxidation of sulfite
B. the metabolic activity of microorganisms
C. a radioactive decay process
D. a geochemical process
Answer: B
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What is basal metabolic rate?
a. the rate at which the body uses energy when exercising b. a measurement designed to assess increased health risk associated with weight c. the amount of calories consumed in one day d. the rate at which the body uses energy when you are at rest e. the rate at which energy is stored within the body
The techniques by which DNA sequence information is used for deriving the three-dimensional
structure of proteins is called ____________________ genomics. Fill in the blank(s) with the appropriate word(s).
Foreign species that have negative effects on native species are called:a
prey species. b. non-native species. c. invasive species. d. predator species. e. endemic species.
Southern Copperhead snake venom contains a protein called disintegrin. Disintegrins bind to a class of membrane receptors called integrins. Platelets use integrin receptors to aggregate at a site of tissue damage
Why does the snake venom contain this molecule? A) After the snake bites its prey, the molecule helps in wound healing. B) The molecule helps kill the snake's prey by producing large clots that travel in the body and produce heart attacks and strokes. C) By binding to the platelets, the molecule inhibits the formation of fibrin. D) The molecule interferes with clot formation so that the venom can travel more efficiently from the site of the bite to the rest of the body.