bader22
  إظهار بيانات الطالب   إظهار التعليمات   تغيير اتجاه الصفحة

رقم السؤال: 1           درجة السؤال: 2.04
 a- Xanthine
 b- Cytosine
 c- Nicotinamide
 d- Flavin.
رقم السؤال: 2           درجة السؤال: 2.04
 a- Deoxynucleic acid.
 b- Deoxyribonucleic acid.
 c- Deoxyribodeoxynucleic acid
 d- Dioxyribonucleic acid
رقم السؤال: 3           درجة السؤال: 2.04
 a- Ribose
 b- Deoxyribose
 c- Ribulose
 d- Arabinose
رقم السؤال: 4           درجة السؤال: 2.04
 a- Guanine.
 b- Adenine.
 c- Xanthine.
 d- Uracil.
رقم السؤال: 5           درجة السؤال: 2.04
 a- Deoxyguanylate&deoxycytidylateareattachedtoeachother by two hydrogen bonds.
 Threehydrogenbondsexistbetweendeoxyadenylate
  c- The A-T attraction is about 50% stronger than the C-G attraction
 d- Noneoftheaboveistrue
رقم السؤال: 6           درجة السؤال: 2.04
 a- Galactose
 b- Ribose.
 c- Deoxy ribose.
 d- Ribulose.
رقم السؤال: 7           درجة السؤال: 2.04
 a- A nitrogen base & ribose.
 b- A nitrogen base , a pentose & phosphate.
 c- A nitrogen base & phosphate
 d- Any of the above
رقم السؤال: 8           درجة السؤال: 2.04
 a- Phosphoric acid.
 b- Pentoses
 c- Adenosine
 d- Cytosine
رقم السؤال: 9           درجة السؤال: 2.04
 a- histones Pts. (proteins)
 b- non-histones Pts.
 c- both a & b.
 d- neither a nor b
رقم السؤال: 10           درجة السؤال: 2.04
 a- N-glycosidic linkage
 b- Peptide bond
 c- Phospho diester bond
 d- Hydrogen bond.
رقم السؤال: 11           درجة السؤال: 2.04
 a- A&TrichDNAdenaturesatalowertemperaturethanG&C rich DNA
 b- Denaturationcausesanincreaseinabsorbanceat260nmofa DNA solution
 c- Both (a) & (b).
 d- Neither(a)nor(b).
رقم السؤال: 12           درجة السؤال: 2.04
 a- DNAisfoundassociatedwithproteins,formingnucleoprotein.
 b- The5'-endofonestrandofDNAisbase-pairedwiththe3'-end of the other strand.
 c- Phosphodiester bonds are heat resistant , but can be cleaved by nuclease enzymes.
 d- DenaturationofDNAresultsfromdisruptionofphosphodiester bonds
رقم السؤال: 13           درجة السؤال: 2.04
 a- A nucleoside
 b- A nucleotide
 c- A purine ring.
 d- A pyrimidine ring
رقم السؤال: 14           درجة السؤال: 2.04
 a- DNAisformedoftwobranchedpolydeoxyribonucleotide chains
 b- DNAissynthesizedbypolymerizationofdeoxynucleotides
 c- DNAispresentinthenucleusandthemitochondria
 d- BacterialDNAispresentinthesinglechromosome&the plasmids.
رقم السؤال: 15           درجة السؤال: 2.04
 a- IsregulatoryrepeatingstructureofDNA&histonesproteins.
 b- HasacoreofDNAwithproteinswrappedaroundtheoutside
 c- Usesonlyonetypeofhistonespernucleosome
 d- Is separated from a second nucleosome by non-histone protein.
رقم السؤال: 16           درجة السؤال: 2.04
 a- DNA
 b- RNA
 c- Both (a) & (b).
 d- Neither(a)nor(b).
رقم السؤال: 17           درجة السؤال: 2.04
 a- A nucleoside phosphate
 b- Ribose diphosphate
 c- A nucleoside minus phosphate
 d- A hydrolytic product of nucleosides
رقم السؤال: 18           درجة السؤال: 2.04
 a- 10%.
 b- 20%.
 c- 30%.
 d- 40%.
رقم السؤال: 19           درجة السؤال: 2.04
 1- The two nucleotide strands are held together by hydrogen
  The number of thymidylate subunits should equal the number of deoxycytidylatesubunits
 The number of deoxyadenylate subunits is essentially equal to the number of deoxyguanylate subunits
  All the above is true.
رقم السؤال: 20           درجة السؤال: 2.04
 a- 2'-hydroxylofonenucleotideto3'-hydroxylofthe ABCDE 1 2 3 4 5 6 Yourscore:.../6 6- following
 b- 3'-hydroxylofonenucleotideto3'-hydroxylofthefollowing.
 3'-hydroxyl of one nucleotide to 5'-hydroxyl of the following.
  d- 5'-hydroxylofonenucleotideto5'-hydroxylofthe following.
رقم السؤال: 21           درجة السؤال: 2.04
 a- Adenine & cytosine.
 b- Guanine & thymine.
 c- Adenine & guanine.
 d- Thymine & uracil.
رقم السؤال: 22           درجة السؤال: 2.04
 a- Theindividualstrandsarenothelical
 b- Hydrogenbondsformbetweenpurine&pyrimidinebaseon the samestrand.
 c- Adenine on one strand is hydrogen bonded to thymine on the opposite strand
 d- Phosphodiesterbondsareorientedtowardtheinteriorofthe helix
رقم السؤال: 23           درجة السؤال: 2.04
 a- Appearanceofthemajor&minorgrooves.
 b- Thickness of the helix
 c- Polarity of the strands.
 d- Numberofbasepairs/turn.
رقم السؤال: 24           درجة السؤال: 2.04
 a- Cytosine
 b- Uracil.
 c- Thymine.
 d- Guanine.
رقم السؤال: 25           درجة السؤال: 2.04
 a- Thetwoendsarestructureequivalent
 b- Themonomericunitsjoinedtogetherbyphosphodiester bonds
 c- There are at least 20 different monomers that can be used.
 d- Themonomericunitsarenotseparatedbyhydrolysis
رقم السؤال: 26           درجة السؤال: 2.04
 a- ThehelicalstructureofDNAhasamajor(wide)groove&a minor (narrow)groove.
 b- Regulatoryproteinsbindtothemajor&minorgrooves, regulating DNA & RNA synthesis.
 c- Separation of the two DNA strands from each other occurs at high temperature & is called reannealing.
 d- Themeltingtemperature(Tm)isthetemperatureatwhichhalf of the helical structure of DNA is lost.
رقم السؤال: 27           درجة السؤال: 2.04
 a- Atriple-strandstructure
 b- TheDNAstrandsrunninginoppositedirections
 c- BasepairingbetweenbasesA&G.
 d- Covalent bonding between bases.
رقم السؤال: 28           درجة السؤال: 2.04
 a- Hydrogenbond
 b- Phosphodiester bonds.
 c- Glycosidicbonds
 d- all theabove
رقم السؤال: 29           درجة السؤال: 2.04
 a- Adenine equals thymine
 b- Adenine equalsuracil
 c- Guanine equals adenine.
 d- Cytosineequalsthymine
رقم السؤال: 30           درجة السؤال: 2.04
 a- Ribose
 b- 2'-deoxyribose
 c- 5'-deoxyribose
 d- Any of the above.
رقم السؤال: 31           درجة السؤال: 2.04
 a- A=3100 , T=2600 , C=2600 , G=3100.
 b- A=3000 , T=2200 , C=3400 , G=3200.
 c- A=2600 , T=2600 , C=3300 , G=3300.
 d- A=3300 , T=3300 , C=2600 , G=2600.
رقم السؤال: 32           درجة السؤال: 2.04
 a- DNAisdoublestrandedwhileRNAisabsolutelysingle stranded
 b- DNAisresponsibleforstoringgeneticinformation&their transfer to daughter cells.
 c- RNA is responsible for expressing the genetic information in the form of protein molecules.
 d- DNAislocatedinthecellnuclei,whileRNAislocatedonlyin the cytoplasm
رقم السؤال: 33           درجة السؤال: 2.04
 a- Adenine.
 b- Cytosine.
 c- Thymine.
 d- Uracil.
رقم السؤال: 34           درجة السؤال: 2.04
 a- Adenine + guanine.
 b- Cytosine+thymine.
 c- Adenine +thymine.
 d- Cytosine+guanine
رقم السؤال: 35           درجة السؤال: 2.04
 a- Cleavage of the phosphodiester bonds.
  b- The formation of triple helix.
 c- A decrease in light absorption at 260 nm.
 d- Thedenaturatedtemperatureisdirectlyrelatedwiththeguanine & cytosine contents.
رقم السؤال: 36           درجة السؤال: 2.04
 a- Deoxyuridylate
 b- Deoxyguanylate
 c- Deoxyadenylate
 d- Deoxycytidylate
رقم السؤال: 37           درجة السؤال: 2.04
 a- Buildingunitsofnucleicacids
 b- Sources of highenergy
 c- Second messengers
 d- Structuralcomponentsofmembranes
رقم السؤال: 38           درجة السؤال: 2.04
 a- rRNA
 b- tRNA
 c- mRNA
 d- hnRNA
 e- DNA
رقم السؤال: 39           درجة السؤال: 2.04
 a- Pyrimidine + pentose + phosphate.
 b- Purine + pentose + phosphate.
 c- Purine or pyrimidine + pentose.
 d- Purine or pyrimidine + phosphate
رقم السؤال: 40           درجة السؤال: 2.04
 a- Guanine.
 b- Cytosine.
 c- Thymine.
 d- Uracil.
رقم السؤال: 41           درجة السؤال: 2.04
 a- Hasfewerbasepairs/turnthanBDNA helix.
 b- Is permanent conformation of DNA.
 c- HasahighcontentofCGsequence
 d- Right handed double helix.
رقم السؤال: 42           درجة السؤال: 2.04
 a- ContainscovalentlylinkedRNA&DNA.
 b- ContainsacoreoftwoeachofhistonesH2A,H2B,H3&H4.
 c- Requireaspecificbasesequenceforformation
 d- ContainacoreoftwoeachofhistonesH1,H2,&H5.
رقم السؤال: 43           درجة السؤال: 2.04
 a- 5'GTTCCCAA-3'.
 b- 5'TTGGGAAC-3'.
 c- 3'TTGGGAAC-5'.
 d- 3'-GTTCCCAA-5'.
رقم السؤال: 44           درجة السؤال: 2.04
 a- Guanine
 b- Thymine
 c- Cytosine
 d- Uracil
رقم السؤال: 45           درجة السؤال: 2.04
 a- Uracil.
 b- Adenine.
 c- Cytosine.
 d- Thymine.
رقم السؤال: 46           درجة السؤال: 2.04
 a- dehydrated,carbon3.
 b- Oxygenated,carbon2.
 c- Oxygenated,carbon3.
 d- Deoxygenate,carbon2
رقم السؤال: 47           درجة السؤال: 2.04
 a- DNA ispolydeoxynucleotide
 DNAexistsasadoublehelixoftwocomplementaryanti- parallel strands
 c- Thymidylate is a distinctive component of D
  DNAhas3'-endsononeside,&two5'-endsontheotherside.
رقم السؤال: 48           درجة السؤال: 2.04
 a- Hydrophobic interactions
 b- Phosphodiester bond.
 c- Vanderwaalsforce
 d- Hydrogen bond.
رقم السؤال: 49           درجة السؤال: 2.04
 a- Poly-nucleoside
 b- Poly-nucleotide
 c- Either (a) or (b).
 d- Neither (a) nor. (b)


   



ارقام الاسئلة التي لم تجب عليها:


هل انت متأكد انك تريد انهاء الاختبار وإرسال اجاباتك؟

  


جميع الحقوق محفوظة © arab-exams.com
  2014-2023