The second law of thermodynamics states that ____.
A. energy can be transformed into matter, and because of this, something is obtained for nothing
B. energy can be destroyed during nuclear reactions such as those that occur inside the sun
C. if energy is gained by one region of the universe, another place in the universe also must gain energy in order to maintain the balance of nature
D. energy tends to flow from concentrated to less concentrated forms
E. energy tends to be stable over time
Answer: D
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Humans cannot survive at sea by drinking salt water. However, marine vertebrates such as sea turtles and various sea birds can survive by drinking salt water. What do they have that humans do not?
A. kidneys that are extremely good at producing a concentrated urine. B. body fluid concentrations that are similar to or greater than those of seawater. C. the ability to secrete salts and wastes into their intestinal contents like an insect. D. They use ammonia as their primary nitrogenous waste. E. salt glands.
________ are small oligonucleotides, 20—30 nucleotides in length, that bind specifically to mRNA and stop translation.
Fill in the blank(s) with the appropriate word(s).
Which of the following is an example of the
result of a beneficial mutation?
a. A new digestive enzyme that is better at digesting cellulose. b. A new digestive enzyme that is equal in its ability to digest cellulose as the existing enzyme. c. A new digestive enzyme that is less effective at digesting cellulose. d. A new protein that interferes with the digestive process. e. A new protein that has no function
In the absence of environmental sources of water, such as precipitation or condensation, how would water get into the pitcher of a carnivorous plant?
A. through the phloem B. from the fruit C. from the cuticle D. through the xylem E. from the leaves