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chem 104 final

chapter 21

QuestionAnswer
Lipid Membranes have how many layers? 2
Which of the following has the largest percentage of cholesterols and cholesterol esters? LDL
What do we mean by an essential fatty acid? A fatty acid which must be part of our diets since we cannot synthesize it.
Which of the following is associated with thromboxanes? Platelet clumping.
which of the following are secondary messengers? both(a)and(b) thromboxanes, prostaglandins, leukotrienes
Which of the following transports cholesterol to the liver? HDL
Which hormone inhibits further ovulation once an egg has been fertilized? Progesterone
Which of the following is the result of high cholesterol levels inside cells? Less LDL is taken into the cells from the plasma.
Where in the body are leukotrienes most commonly found? white blood cells.
which of the following correctly describes membrane proteins? Any of the above, depending on the specific membrane protein
what is the function of secondary messengers such as prostaglandins? To carry a message from one part of a cell to another part of the cell.
Which of the following are primary messengers? Steroid Hormones.
Which of the following correctly describes the function of cox-1 and cox-2? COX-1 catalyzes normal physiological production of prostaglandins, but COX-2 promotes production of prostaglandins in inflammation.
What is the function of a steroid hormone primary messenger? To deliver signals from one part of the body to another.
How many rings are associated with the steroid structure? 4 rings
Which of the following is generally called "bad cholesterol?" LDL
Which of the following is a function of unsaturated fatty acids in membranes? They give the interior of the membrane liquid like structure.
Where is cholesterol synthesized? In the liver.
Which of the following reactions is the source of trans fatty acids found in some processed foods? Hydrogenation.
Which of the following is generally called "good cholesterol?" HDL
Lipids perform which of the following functions? all of the above, (just remember what a lipid is/does.) storage, membrane components, chemical messengers
Which of the following is used to define lipids? Their insolubility in water.
Myelin, the coating of nerve axons is which type of lipid? Sphingolipid
Aspirin and other NSAIDs do which of the following? Inhibit both COX-1 and COX-2 activity.
Which of the following carries cholesterol to the cells? LDL
What is the IUPAC name of glycerol? 1,2,3-propanetriol
In glycerophospholipids where is the phosphate group attached to glycerol? At a terminal carbon only.
Cholesterol is used as which of the following? All of these. (just remember what cholesterol does/ is.) component of membrane and precursor of all steroid hormones and bile acids.
Which of the following describes the distribution of the polar and nonpolar portions of lipids in the lipid bilayer? Both polar heads are on the outside of the bilayer and both hydrophobic tails are on the inside of the bilayer.
Which hormone triggers ovulation? luteinizing hormone
Which alcohol is a component of all triglycerides? Glycerol
How many different types of lipoproteins are associated with cholesterol transport? 4 (HDL,LDL,VLDL,CHYLOMICRONS)
Created by: anel