You have chosen RNA as the most likely molecule to be first enclosed by a membrane. You understand that it has the ability to store information and can self-replicate, but what else is necessary for simple metabolic processes to occur in a timely manner?
A. A biological catalyst.
B. Energy from ADP.
C. A pump, to drive a concentration gradient.
D. A more stable nucleic acid.
E. The ability to carry out structural roles.
A. A biological catalyst.
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Which of these is not a type of water pollutant?
(a) dissolved oxygen. (b) toxic chemicals. (c) organic wastes. (d) sediment.
The two strands of a DNA molecule are held together by ________
a. phosphodiester linkages b. covalent bonds c. peptide bonds d. hydrogen bonds
Changes in blood pH are detected by:
a. interoceptors. b. exteroceptors. c. mechanoreceptors. d. proprioceptors. e. thermoreceptors.
In an average ecosystem, about how much energy is present in the organisms at a given trophic level compared to the organisms at the next higher trophic level?
A) a tenth as much B) half as much C) twice as much D) ten times as much