Top 80+ Solved Molecular Basis of Inheritance MCQ Questions Answer
Q. What does X replesent in the above diagram
a. Released polypeptide chain
b. Released 3D protein molecule
c. Released secondary protein
d. Released tertiary protein
Q. What does ‘X’ represent
a. gene
b. segment of DNA
c. seqment of DNA coding for specific protein
d. Both A & C
Q. What would happen if in a gene encoding polypeptide of 50 aminoacids 25th codon (UAU) is mutated to UAA ? (AIPMT - 2003)
a. A Polypeptide of 24 aminoacids will be formed
b. Two polypeptides of 24 and 25 aminoacids will be formed
c. A polypeptide of 49 aminoacids will be formed
d. A polypeptide of 25 aminoacids will be formed
Q. Which one of the following triplet codes, is correctly matched with its specificity for an aminoacid in protein synthesis or as ‘start’ or ‘stop’ codon ?
a. UCG - start
b. UUU - stop
c. UGU - Leucine
d. UAC - Tyrosine
Q. What does “Lac” refer to in what we call the lac operon ? (AIPMT - 2003)
a. Lactose
b. Lactase
c. Lac insect
d. The number 1,00,000
Q. The following ratio is generally constant for a given species (AIPMT - 2004)
a. A + G / C + T
b. T + C / G + A
c. G + C / A + T
d. A + C / T + G
Q. During transcription if the nucleotide sequence of the DNA strand that is being coded is ATACGthen the nucleotide sequence in the m RNA would be (AIPMT - 2004)
a. TATGC
b. T C T G G
c. U A U G C
d. U A T G C
Q. Which one of the following makes use of RNA template to synthesize DNA (AIPMT - 2005)
a. DNA polymerase
b. RNA polymerase
c. Reverse transcriptase
d. DNA dependant RNA polymerase
Q. Protein synthesis is an animal cell occurs (AIPMT - 2005)
a. only on the ribosomes present in cytosol
b. only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
c. On ribosomes present in the nucleolus as well as in cytoplasm
d. on ribosomes present in cytoplasm as well as in mitochondria
Q. E coli cells with a mutant z gene of the lac operon cannot grow in medium containing only lactose asthe source of energy because (AIPMT - 2005)
a. the lac operon is constitutively active in these cells
b. they cannot synthesize functional beta galactosidase
c. in the presence of glucose E Coli cell do not utilize lactose
d. they cannot transport lactose from the medium into the cell
Q. Aminoacid Sequence in protein synthesis is decided by the sequence of (AIPMT - 2006)
a. r RNA
b. t- RNA
c. m RNA
d. c DNA
Q. Antiparallel strands of a DNA molecule means that (AIPMT - 2006)
a. One strand turns clockwise
b. One strand turns anticlockwise
c. The phosphate groups of two DNA strands , at their ends share the same position
d. The phosphate groups at the start of two DNA strands are is opposite position (Pole).
Q. Polysome is formed by (AIPMT - 2008)
a. a ribosome with several subunits
b. ribosomes attached to each other in a linear arrangement
c. several ribosomes attached to a single m RNA
d. many ribosomes attached to a strand of endoplasmic reticulum