Biochem Practice Exam (Lipids)

8/13/2019 Biochem Practice Exam (Lipids)

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CHAPTER ELEVEN

LIPIDS AND MEMBRANES

1) Fatty acid groups are referred to as ________ groups. Ans

A) Acetyl

B) Acyl

C) Prenyl

D) IsoprenoidE) Isopentenyl

2) The double bonds in naturally occurring fatty acids are usually _______ isomers. Ans

A) Cis

B) Trans

C) Both cis and trans

D) EssentialE) Nonessential

4) Fatty acids react with alcohols to form _____. Ans

A) Aides

B) Ethers

C) Anhydrides

D) Epo!idesE) Esters

!) "rostaglandins are in#ol#ed in _________. Ans

A) "#$lation

B) In%laation

C) Me&rane coposition

D) Both A and B are correct

E) All o% the a&o#e are correct

%) The functions of fat include Ans

A) Ins$lationB) Ener'y stora'e

C) (aterrepellent properties



&) 'a(es Ans

A) Are cople! i!t$res o% nonpolar lipids

B) Are esters %ored %ro lon'chain %atty acids and lon'chain alcohols

C) Contain hydrocar&ons* sterols* and alcohols


E) Both A and C are correct

) "hospholipids are Ans

A) Str$ct$ral coponents o% e&ranes

B) S$r%ace acti#e a'ents

C) Rich ener'y so$rces



*) "hosphatidylcholine is sometimes referred to as ______. Ans

A) PIP+ B) Cephalin

C) Ceraide D) Cardiolipin

E)None o% the a&o#e are correct


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1+) The myelin sheath Ans

A) S$rro$nds ner#e cell a!ons

B) Contains lar'e ao$nts o% cardiolipin

C) ,acilitates ner#e ip$lse transission


E) Both A and C are correct

12) The role of #ery low density lipoproteins is Ans

A) Sca#en'in' the cholesterol %ro cell e&ranes

B) Transportin' o% lipids %ro li#er to tiss$es

C) Transportin' o% cholesterol esters to the li#er

D) Both A and B are correctE) All o% the a&o#e are correct

14) 'hich of the following molecules is not a lipid, Ans

A) ,atty acids

B) Steroids

C) Isoprenoids

D) (a!esE) All o% the a&o#e are lipids

1!) The basic structure of biological membranes is a conse-uence of the physical properties of _______. Ans

A) Proteins

B) Phospholipids

C) Cholesterol

D) (ater

E) None o% the a&o#e are correct

1%) A membranes fluidity is largely determined by the percentage of Ans

A) Phosphatidyl cholineB) Phosphatidylethanolaine

C) ,atty acids

D) Cardiolipin

E) -nsat$rated %atty acids

24) /0% Fatty acids Ans

A) Ha#e a do$&le &ond si! car&on atos %ro the car&onyl end o% the chain

B) Ha#e a do$&le &ond si! car&on atos %ro the ethyl end o% the chain

C) Ha#e si! do$&le &onds in the olec$le

D) Ha#e three ore do$&le &onds than . %atty acids

E) Contain si! trans do$&le &onds in the olec$le

2*) 'hich of the following structural features distinguishes thrombo(anes from prostaglandins, Ans

A) An ether rin'

B) "ne "H 'ro$p

C) T/o do$&le &onds

D) "ne do$&le &ond

E) trans do$&le &onds

+) eutral fats belong to which of the following, Ans

A) Phospholipids B) 0lycolipids

C) Prosta'landins D) Triacyl'lycerols

E) ,ree %atty acids


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1) 3n addition to the prostaglandins and leuotrienes the autocrine regulators include5 Ans

A) Arachidonic acid

B) Linoleic acid

C) Thro&o!anes

D) Steroids


2) 6hoose the lipid class that acts as surfactants. Ans

A) Triacyl'lycerols

B) ,atty acids

C) (a!es

D) Phospholipids

E) Both A and B are correct

) 7embrane proteins are lined to anchor molecules through a ___________ lin Ans

A) Ether

B) Ester

C) Aide

D) Aino

E) Plasa

4) 'hich of the following is not liely to be a naturally occurring fatty acid Ans

A) C1.H+2C""H

B) C13H+4C""H

C) C15H.1C""H

D) C12H.5C""H

E) C14H.4C""H

!) The function of dolichols is to Ans

A) Transport s$'ars in 'lycoprotein synthesis

B) Bind car&ohydrate on the cell s$r%ace o% &acteriaC) Bind to o!y'enated carotenes

D) Ser#e as prec$rsors o% carotenoids

E) They are de'radation prod$cts o% steroids

4) "hospholipase 6 hydroly8es ______ ester bonds in phospholipids Ans

A) C1

B) C+

C) C.

D) Both C1 and C+

E) All o% the a&o#e

44) 'hich of the following is not a function of phospholipases, Ans

A) Me&rane reodelin'

B) Si'nal transd$ction

C) Ener'y stora'e

D) Di'estion

E) To!ic Phospholipases

4!) 7embranes are rigid when they contain Ans

A) Lar'e ao$nts o% cholesterolB) Lar'e ao$nts o% $nsat$rated %atty acids

C) Lar'e ao$nts o% sat$rated %atty acids

D) Lar'e ao$nts o% /ater


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E) A and B

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Biochem Practice Exam (Lipids)