In order to maintain cellular homeostasis, one abundant type of exchange pump ejects ________ ions from the cell and imports ________ ions
A) potassium; calcium
B) sodium; calcium
C) potassium; sodium
D) sodium; potassium
E) calcium; sodium
D
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Which of the following statements concerning mitochondria is false?
A) The cristae increase the inner surface area of the organelle. B) The matrix contains metabolic enzymes involved in ATP synthesis. C) Respiratory enzymes are attached to the surface of the cristae. D) The mitochondria produce oxygen in the process of energy transformation. E) The mitochondria produce most of a cell's ATP.
Match the following stages of sleep with their descriptions:
A) Stage 2 B) Stage 1 C) Stage 3 D) REM E) Stage 4 1) The stage when vital signs (blood pressure, heart rate, and body temperature) reach their lowest normal levels. 2) Indicated by movement of the eyes under the lids; dreaming occurs. 3) Theta and delta waves begin to appear. 4) Very easy to awaken; EEG shows alpha waves; may even deny being asleep. 5) Typified by sleep spindles. 6) Begins about 90 minutes after the onset of sleep. 7) Necessary for emotional health; may be neural "debugging."
Cellular actions of insulin could be inhibited by ________.
A. decreasing intracellular calmodulin B. inhibiting translation C. stimulating protein kinase activity D. inhibiting receptor phosphorylation
Atp
A. serves as the energy currency of the cell. B. can store, but cannot release energy in the cell. C. is a sugar found in transfer RNA. D. stores genetic information. E. is a nucleotide found in DNA.