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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Choose the description below that best matches the current model of RNA polymerase holoenzyme.
A. A core enzyme composed of five sigma factors bound by a polypeptide chain. B. A core enzyme composed of five polypeptides bound by ribosomes. C. An open complex or "bubble" formed by DNA, mRNA, and RNA polymerase. D. A core enzyme composed of five polypeptides bound by a transcription factor.
In the human systemic circuit, blood will pass through all but which of the following?
a. liver b. limbs c. lungs d. digestive organs e. brain
In oxidation-reduction reactions, all of the
following are true EXCEPT a. one molecule gives up electrons. b. one molecule gains electrons. c. cells release energy. d. the molecule that accepts electrons is oxidized. e. hydrogen ions are usually released
Nondisplaced
What will be an ideal response?