Help with multiple choice questions, please? 1) Which of the following terms bes
ID: 922781 • Letter: H
Question
Help with multiple choice questions, please?
1) Which of the following terms best describes the compound below?
CH3(CH2)12CO2H
A. a fatty acid
B. an oil
C. a wax
D. a soap
E. a phosphatidic acid
2) A -hydroxyaldehyde may cyclize to form:
A.a hemiacetal.
B.an ester.
C.a pyrimidine.
D.a lactone.
E.a lactam.
3) Which of the following best explains why the melting points of saturated fats increase with increasing molecular weight?
A.decreased polarity
B.decreased hydrogen bonding
C.increased hydrogen bonding
D.decreased intermolecular van der Waal's interactions
E.increased intermolecular van der Waal's interactions
4) In a disaccharide, two monosaccharides are joined by what kind of bond?
A. double
B.anomeric
C.alcohol
D.glycosidic
E.rotational
5) Which of the following statements about sterols is true?
A.Sterols are found in the membrane of all living cells.
B.The principal sterol of animal cells is ergosterol.
C.All sterols share a fused-ring structure with four rings.
D.Sterols are very soluble in water, but less soluble in organic solvents such as chloroform.
6) A biological catalyst is called a(n) _____.
A.lipid
B.enzyme
C.cofactor
D.coenzyme
E.substrate
7)What kinds of interactions are NOT part of tertiary protein structure?
A.peptide bonds
B.disulfide bonds
C.hydrophilic interactions
D.salt bridges
E. hydrophobic interactions
8) A D-aldopentose is subjected to Kiliani-Fischer chain lengthening and the resulting mixture is oxidized using nitric acid. The two distinct products both show optical activity. From this one can conclude that the original
A.must be D-ribose.
B.is either D-ribose or D-arabinose.
C.must be D-xylose.
D.is either D-xylose or D-arabinose.
E.must be D-lyxose.
9) Which of the following terms best describes the exterior surface of a soap micelle in water?
A.hydrophobic
B.hydrophilic
C.hard
D.saponified
E.hydrogenated
10) Sucrose is a reducing sugar. T or F?
11) Which of the following describes the side chain for Alanine?
A.hydrogen
B.ethyl group
C.methyl group
D.isopropyl group
E.sec-butyl group
12) Which of the following is NOT a function of glycerophospholipids?
A.transport of triacylglycerols
B.regulation of cellular permeability
C.protect nerve cells
D.aid in digestion
E.transport of cholesterol
13) Unsaturated fatty acids have lower melting points than saturated fatty acids because?
A.they have fewer hydrogen atoms.
B.they have more hydrogen atoms.
C.their molecules fit closely together.
D.the cis double bonds give them an irregular shape.
E.the trans double bonds give them an irregular shape.
14) Hydrogenation of a double bond in a triacylglycerol requires a catalyst. T or F?
15) Which of the following is the precursor for all steroids?
A.cholesterol
B.cortisone
C.progesterone
D.estrone
E.androsterone
16) The linkage between two monosaccharides to form a disaccharide is called a glycosidic linkage. T or F?
17) The and anomers of a D-glucopyranose are related as:
A.enantiomers.
B.meso compounds.
C.structural isomers.
D.epimers.
E.disaccharides.
18) Proteins which provide all the essential amino acids in about the right proportions are called:
A.globular proteins.
B.enzymes.
C.complete proteins.
D.glycoproteins.
E.nucleoproteins.
19) Which of the following terms best describes the side chain of valine?
A.acidic
B.basic
C.charged, polar
D.uncharged, polar
E.nonpolar
Explanation / Answer
1) A
2) D
3) E
4) D
5) A
6) B
7) D
9) A
10)F
11) C
15) A
16) T
19 ) NON POLAR
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