The development of a cancer requires both the _______ of an oncogene and the ________ of a tumor suppressor
A. activation; inhibition
B. inhibition; activation
C. inhibition; inhibition
D. activation; activation
A
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Imagine that a young girl suffers a horseback-riding injury, and one of her ribs punctures her diaphragm. How will this injury affect the girl's breathing? Select all correct choices
A. The injury will make it easier to increase negative air pressure in her chest cavity, making inhalation easier. B. The injury will make it more difficult to increase negative air pressure in her chest cavity, making inhalation more difficult. C. The injury will make it more difficult to decrease negative air pressure in her chest cavity, making inhalation more difficult. D. The injury will not affect her at all, as intercostal muscles are responsible for breathing
Passive diffusion
A. is the process by which molecules move from an area of low concentration to an area of high concentration. B. is a spontaneous process. C. requires the presence of a transmembrane protein. D. Occursonly when the membrane is permeable to the solute. E. requires energy.
Which of the following is NOT true about
cyanobacteria? a. Cyanobacteria have the same light-capturing chlorophylls as plants. b. Chloroplasts evolved from ancient cyanobacteria. c. Cyanobacteria can fix carbon. d. Cyanobacteria can fix nitrogen. e. Cyanobacteria put nearly all of the nitrogen into Earth’s atmosphere.
What diffuses from the air in the alveoli into the blood?
A. water B. nitrogen C. oxygen D. carbon dioxide E. methane