Which one of the following is TRUE regarding the sodium-potassium pump?
A) Cholesterol molecules within the plasma membrane pump sodium out of the cell and potassium into the cell.
B) In order to reduce cell volume, the cell decreases the activity of the sodium-potassium pump.
C) Because the sodium-potassium pump works on the principle of diffusion, it does not require energy.
D) Increased activity of the sodium-potassium pump causes an increase in cell volume.
E) In order to maintain a certain cell volume, the sodium-potassium pump exchanges three sodium ions for two potassium ions.
E
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The central dogma describes the flow of information of gene expression as ____
a. DNA ® RNA ® protein b. RNA ® DNA c. RNA ® DNA ® protein d. protein ® DNA ® RNA e. DNA ® protein ® RNA
Of the following list, flagellated (swimming) sperm are generally present in which groups?
1. Lycophyta 2. Bryophyta 3. Angiosperms 4. Chlorophyta 5. Pterophyta A) 1, 2, 3 B) 1, 2, 4, 5 C) 1, 3, 4, 5 D) 2, 3, 5 E) 2, 3, 4, 5
The group that probably gave rise to chloroplasts is the
A. cyanobacteria. B. green photosynthetic bacteria. C. purple sulfur bacteria. D. non-sulfur purple bacteria. E. methane bacteria.
Proteins that act as ____________________ catalyze biochemical reactions and are vital components of the cell’s
metabolic pathways. Fill in the blank(s) with the appropriate word(s).