A) The resting membrane potential is determined mainly by the concentration gradients and differential permeability of the plasma membrane to K+ and Na+ ions.
B) In their resting state, all body cells exhibit a resting membrane potential.
C) The resting membrane potential occurs due to active transport of ions across the membrane due to the sodium-potassium pump.
D) The resting membrane potential is maintained solely by passive transport processes.
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A) exocytosis
B) phagocytosis
C) intracellular vesicular trafficking
D) pinocytosis
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Normal cells divide in two distinct even...View Answer
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A) a decrease in the permeability of the tumor cell's plasma membrane preventing the uptake of chemotherapy drugs
B) allowing the cancer cells to bind to their healthy, neighboring cells
C) cells of the immune system recognizing the tumorous cells as foreign and destroying them
D) the cancer cells conserving energy for more growth
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A) All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell.
B) The lipid bilayer is a solid at body temperature, thus protecting the cell.
C) Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains.
D) Phospholipids form a bilayer that is largely impermeable to water-soluble molecules.
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A) Cyclic AMP and calcium may be second messengers.
B) Second messengers act through receptors called K-proteins.
C) Second messengers usually inactivate protein kinase enzymes.
D) Second messengers usually act to remove nitric oxide (NO) from the cell.
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nuclear regions cont...View Answer
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A) breaking down bone to release calcium ions into the blood
B) digesting particles taken in by endocytosis
C) help in the formation of cell membranes
D) degrading worn-out or nonfunctional organelles
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Exons are amino acid-specifying informat...View Answer
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A) Golgi apparatus, rough endoplasmic reticulum
B) mitochondria, and cilia
C) smooth endoplasmic reticulum, and lysosomes
D) cytoskeleton, and peroxisomes
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A) is division of the genetic material within the nucleus
B) is always a part of the cell cycle
C) is the formation of sex cells
D) creates diversity in genetic potential
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1. chemical insults and free radical for...View Answer
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Saline contains solutes that make it iso...View Answer
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A) glycolipids in the glycocalyx
B) wavy contours of the membranes of adjacent cells
C) special membrane junctions
D) glycoproteins in the glycocalyx
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Hydrostatic pressure is the pressure of ...View Answer
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A) exocytosis
B) phagocytosis
C) receptor-mediated endocytosis
D) pinocytosis
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A) swell and burst
B) shrink
C) neither shrink nor swell
D) swell initially, then shrink as equilibrium is reached
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