chapter 21
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Lipid Membranes have how many layers? | 2
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| Which of the following has the largest percentage of cholesterols and cholesterol esters? | LDL
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| What do we mean by an essential fatty acid? | A fatty acid which must be part of our diets since we cannot synthesize it.
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| Which of the following is associated with thromboxanes? | Platelet clumping.
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| which of the following are secondary messengers? | both(a)and(b)
thromboxanes, prostaglandins, leukotrienes
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| Which of the following transports cholesterol to the liver? | HDL
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| Which hormone inhibits further ovulation once an egg has been fertilized? | Progesterone
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| Which of the following is the result of high cholesterol levels inside cells? | Less LDL is taken into the cells from the plasma.
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| Where in the body are leukotrienes most commonly found? | white blood cells.
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| which of the following correctly describes membrane proteins? | Any of the above, depending on the specific membrane protein
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| 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.
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| Which of the following are primary messengers? | Steroid Hormones.
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| 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.
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| What is the function of a steroid hormone primary messenger? | To deliver signals from one part of the body to another.
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| How many rings are associated with the steroid structure? | 4 rings
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| Which of the following is generally called "bad cholesterol?" | LDL
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| Which of the following is a function of unsaturated fatty acids in membranes? | They give the interior of the membrane liquid like structure.
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| Where is cholesterol synthesized? | In the liver.
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| Which of the following reactions is the source of trans fatty acids found in some processed foods? | Hydrogenation.
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| Which of the following is generally called "good cholesterol?" | HDL
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| Lipids perform which of the following functions? | all of the above, (just remember what a lipid is/does.) storage, membrane components, chemical messengers
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| Which of the following is used to define lipids? | Their insolubility in water.
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| Myelin, the coating of nerve axons is which type of lipid? | Sphingolipid
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| Aspirin and other NSAIDs do which of the following? | Inhibit both COX-1 and COX-2 activity.
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| Which of the following carries cholesterol to the cells? | LDL
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| What is the IUPAC name of glycerol? | 1,2,3-propanetriol
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| In glycerophospholipids where is the phosphate group attached to glycerol? | At a terminal carbon only.
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| 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.
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| 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.
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| Which hormone triggers ovulation? | luteinizing hormone
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| Which alcohol is a component of all triglycerides? | Glycerol
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| How many different types of lipoproteins are associated with cholesterol transport? | 4 (HDL,LDL,VLDL,CHYLOMICRONS)
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