BINC BIOLOGY, PHYSICAL AND CHEMICAL SCIENCE QUESTION PAPER

Question # 1. Polycistronic mRNA refers to
A. mRNA which is transcribed by multiple RNA polymerases
B. mRNAs that are simultaneously translated
C. mRNA that is translated by many ribosomes simultaneously
D. mRNA with multiple open reading frames

Question # 2. Many genes involved in pathogenicity are located in defined continuous regions
(“islands”) of the genome and have different GC content from other portions of
the genome, suggesting that they have arisen through
A. horizontal gene transfer
B. gene duplication and subsequent mutation
C. protection from methylation
D. increase in the rate of mutation of successive GC pairs

Question # 3. A linear arrangement of three DNA nucleotides called a triplet contains four possible bases (A, C, G and T). How many different triplets are possible without ‘AT’ as first two letters?
A. 32
B. 48
C. 60

D. 64
Question # 4. Which of the following hybrids will be most stable?
A. AGTGTC
TCACAG
B. ATAGGC
TATCCG
C. GTTGGC
CAACCG
D. ATTGGC
TTTCCG

Question # 5. Mention the type of the following reaction
 C12H22O11 + H2O ---> C6H12O6 + C6H12O6
A. Synthesis
B. Hydrolysis
C. Dehydration
D. Hydrogenation
Question # 6. The dominant allele R causes seeds of maize to be coloured where as the recessive
allele r causes the seeds to be colourless. From the cross Rr x Rr, what fraction of
the coloured seeds will be heterozygous?
A. 2/3
B. 1/2
C. 1/3
D. 1/4

Question # 7. Value of coefficient of kurtosis for a Normal distribution is
A. positive
B. negative
C. equal to one
D. equal to three
Question # 8. Most accurate mass with highest sensitivity in case of a protein is determined by
A. high resolution Mass spectrometer
B. electrospray ionization tandem Mass spectrometer
C. MALADI– TOF
D. 2D Gel electrophoresis