Familial hypercholesterolemia is characterized by _____
A) defective LDL receptors on the cell membranes
B) poor attachment of the cholesterol to the extracellular matrix of cells
C) a poorly formed lipid bilayer that cannot incorporate cholesterol into cell membranes
D) inhibition of the cholesterol active transport system in red blood cells
A
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A(n) ________ occurs when a warm, stagnant layer of air traps a cooler mass of air containing smog below it
Fill in the blank(s) with correct word
A student uses restriction enzymes to cut a DNA molecule into fragments. The digested DNA is loaded into the wells of an agarose gel and the gel is subjected to an electric current. Upon completion of the run, the gel is stained. The type and density of the gel are important because
(A) they influence the rate of migration of the fragments (B) they may cause some DNA molecules to replicate (C) some DNA nucleotides may be lost due to chemical reactions with the gel (D) some DNA molecules may sink to the bottom and not migrate (E) some DNA molecules may cross-link
The respiratory systems of fishes, frogs, sponges, and earthworms are similar in that they
A) exchange gases across a moist respiratory surface. B) have internal respiratory structures. C) utilize a complex network of air-conducting tubes. D) employ an extensive system of air sacs that ensures a unidirectional flow of air. E) have a countercurrent exchange system.
A membrane surrounding a capsid
What will be an ideal response?