MDCAT Biology Entry Test No.3 Past Papers Chapter Wise

MDCAT BIOLOGY ENTRY TEST NO.3

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1.  __________ found that DNA contains three main components.

(a)   Erwin chargaff         (c) P.A. Levene  

(b)   Friedrich Miescher  (d) Maurice Wilkins   

82.   In phosphodiester bond, the phosphate group is linked to the two sugars by means of a pair of ester bonds represented as

(a) O-C-P          (c) C-P-O

(b) P-O-C          (d) P-N-C

83.  Is the structural formula of

(a)   Thymine     (c) Cytosine

(b)  uracil           (d) Guanine  

84.  Which one of following is correct about DNA bases   

(a) T + A = C + G          (c) A + G = C + U

(b) A + C = G + T         (d) A + G = C + T   

85.  DNA fibers were prepared by

(a) Rosalind Franklin      (c) Francis crick

(b) Maurice Wilkins       (d) James Watson    

86.  According to Watson and Crick’s model base pairs keep the diameter of DNA molecule a constant

(a) 2 nm            (c) 0.34 nm

(b) 3.4 nm          (d) 34.0 nm   

87.  In DNA molecule, the base pairs are planer (flat) and stack _________ apart.

(a) 2 nm            (c) 0.34 nm

(b) 3.4 nm          (d) 34.0 nm        

88.  DNA spcify the structure of the

(a) proteins       (c) Carbohydrates & lipids

(b) nucleic acids (d) Organism    

89.  Ingram showed that sickle cell anemia is caused by a change from

(a) valine to glutamic acid (c) Valine to Histidine

(b) Glutamic acid to valine (d) Histidine to valine   

90.  A relatively small enzyme that plays supporting role in DNA replication

(a) DNA polymerase I   (c) DNA polymerase III

(b) DNA polymerase II  (d) Primase  

91.  DNA polymerase III move at a rapid rate, some

(a) 10 nucleotides/second (c) 1000 nucleotides/sec  

(b) 100 nucleotides/sec               (d) 10,000 nucleotides/sec   

92.  Which one of following initiate synthesis of DNA   

(a) DNA polymerase I   (c) DNA polymerase III

(b) DNA polymerase II  (d) Primase   

93.  Unwinding of the DNA double helix is controlled by the enzyme

(a) Ligase         (c) Primase

(b) Helicase      (d) Polymerase  

94.  The process of production of mRNA copy of the gene is called

(a) Transcription                       (c) Replication

(b) Reverse Transcription           (d) Translation   

95.  During Translation ____________ provides the site where polypeptides are assembled

(a) DNA           (c) mRNA

(b) tRNA          (d) rRNA

96.  Transfer RNA molecules transport the amino acids to the ribosome for use in building the

(a) polynucleotide          (c) polysaccharide

(b) polypeptide              (d) polymer    

97.  Human cells contain about 45 different kinds of

(a) RNA           (c) rRNA

(b) mRNA         (d) tRNA

98.  Only one of the two strands of DNA are

(a) Transcribed  (c) Replicated  

(b) Translated   (d) Synthesized  

99.  The RNA polymerase enzyme syntehsize

(a) DNA form 5’ ® 3’ direction (c) RNA form 5’ ® 3’ direction

(b) DNA form 3’ ® 5’ direction (d) RNA form 3’ ® 5’ direction

100.  In prokaryotic within promoter -35 sequence binding site is

(a) TATAAT                 (c) TTGACA

(b) TAATAT                 (d) GACATT

101.  A codon consists of three   

(a) amino acids             (c) nucleotides   

(b) nucleic acid              (d) RNA

102.  UGA codon is normally a stop codon but in mitochondria it reads as

(a) valine          (c) methionime

(b) tryptophan    (d) Phenylalanine  

103.  The mRNA lies on the ribosome in such a way that only one of its codon is exposed at

(a) promotor site (c) amino acyl site    

(b) peptide site               (d) Exit stie   

104.  Non sense codon are recongnized by

(a) Release factor          (c) initiation factor    

(b) elongation factor       (d) tRNA

105.  Between the seminiferous tubule of male reproductive system are interstitial cells which secrete

(a) spermatozoa (c) testosterone    

(b) ICSH            (d) MSH

106.  Testes produce

(a) Sperms        (c) sperms & testosterone  

(b) testosterone  (d) urine  

107.  Second meiotic division in the oocyte is completed until  

(a) metaphase   (c) anaphase

(b) fertilization   (d) telophase  

108.  The uterine tube of female reproduction system opens into

(a) oviduct        (c) vagina

(b) ovary           (d) uterus   

109.  During spermatogenesis spermatogonia increase in size to form

(a) sperms          (c) primary spermatocyte  

(b) spermatids   (d) secondary spermatocyte

110.  The secondary oocyte unergoes the second meiotic division producing

(a) egg + first polar body  (c) first & second polar body

(b) egg + second polar body(d) ovum only