Which of the following is a characteristic of active transport?
A. Use of ATP or a proton gradient as a source of metabolic energy
B. Saturable uptake rate
C. Can move materials against a concentration gradient
D. All of the choices are correct.
Answer: D
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Deoxyribonucleic acid is used for: (choose all that apply)
A. transmission of information. B. storage of information. C. biological catalysis. D. energy storage. E. cell-to-cell communication.
What is the main benefit of having hemoglobin in the blood?
A. It increases the amount of oxygen that can be carried in the blood. B. It keeps oxygen separated from carbon dioxide within the blood. C. It increases the solubility of carbon dioxide in the blood plasma. D. It is an important source of iron for body cells. E. All of the answer options are correct.
The organisms that most specifically utilize light energy to make organic molecules from inorganic molecules are
A. photohemitrophs. B. heterotrophs. C. photoisotrophs. D. photoautotrophs. E. photoheterotrophs.
Heterotrophs that obtain energy and carbon by feeding on both animal and plant materials are called ____.
A. detritivores B. herbivores C. carnivores D. omnivores E. decomposers