Glucose is transported across a plasma membrane by the process of facilitated transport.
a. true
b. false
Answer: a. true
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At an atmospheric pressure of 870 mm Hg with 21 percent oxygen, the partial pressure of oxygen is _____
A) 100 mm Hg B) 127 mm Hg C) 151 mm Hg D) 182 mm Hg E) 219 mm Hg
Which of the following best describes how ATP synthase converts the potential energy of the proton gradient to the chemical energy of ATP?
A. Kinetic energy from the flow of protons is converted to the kinetic energy of rotation of the F0 subunit; this is transferred to the F1 subunit and used to catalyze ATP synthesis. B. The flow of protons through the F0 subunit reduces the F1 subunit, which allows ADP to be oxidized to ATP. C. The flow of protons through the F0 subunit oxidizes the F1 subunit, which allows ADP to be reduced to ATP. D. Kinetic energy from the flow of protons is stored in a new electrochemical gradient within the F0 subunit. The potential energy of the electrochemical gradient, in turn, is converted to kinetic energy in the F1 subunit and used to catalyze ATP synthesis. E. None of these answer options accurately describes how ATP synthase converts the potential energy of the proton gradient to the chemical energy of ATP.
Assuming the plant survives, predict what would occur if you removed the shoot apical meristem of a plant embryo.
A. Growth would only occur at in the roots. B. The plant would grow two or more new shoot apical meristems. C. The root apical meristem would take over the function of the shoot apical meristem. D. The plant would mature, but only through vertical growth--no branches would form.
Because DNA replication takes place at an extremely rapid rate, a cell must repair breaks in a strand of DNA up to
approximately how many times in an hour? a. 10 b. 1,000 c. 10,000 d. 200,000 e. 2,000,000