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This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on Molecular Basis of Inheritance Set 4
Q1 | Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a “triplet” (AIPMT - 2009)
- Hershey and chase
- Morgan and sturtevant
- Beadle and Tatum
- Nirenberg and Mathai
Q2 | Select the two correct statement out of the four statement given below about “ Lac opern”(AIPMT-2010)(i) Glucose or galactose may bind with the repressor and inactivate it(ii) In the absence of lactose the repressor bind with the operator region(iii) The Z -gene codes for permease(iv) This was elucidated by Francois Jacob and Jacques MonodThe correct statements are
- ii and iii
- i and iii
- ii and iv
- i and ii
Q3 | Which one of the following does not follow the central dogma of molecular biology ? (AIPMT - 2010)
- Pea
- Mucor
- Chlamydomonas
- HIV
Q4 | The lac opern consists of (AIPMT - 2010)
- four regulatory genes only
- One regulatory gene and three structural genes
- Two regulatory genes and three structural genes
- three regulatory genes and three structural genes
Q5 | The 31 - 51Phosphodiester linkages inside a potynucleotide chain serve to join AIPMT - 2010)
- One DNA strand with the other DNA strand
- One nucleoside with another nucleoside
- One nucleotide with another nucleotide
- One nitrogen base with pentose sugar
Q6 | Ribosomal RNA is actively synthesized by
- Lysosomes
- nucleolus
- nucleoplasm
- ribosomes
Q7 | If one strand of DNA has the nitrogenous base sequence as ATCTG, What would be thecomplementary RNA strand Sequence (AIPMT - 2012)
- TTAGU
- UAGAC
- AACTG
- ATCGU
Q8 | Semiconservative DNA replication using 15 N was demonstrated by (AIIMS -1994)
- Meselson
- Taylor
- Meselson and stahl
- Hershey and chase
Q9 | In operan concept, the operator gene combines with (AIIMS -1986)
- Regulator protein to switch off structural gene transcription
- Regulator protein to switch on structural gene transcription
- Inducer to switch off structural gene transcription
- Regulator gene to switch off structural gene transcription
Q10 | Termination of polypeptide chain is brought about by
- UUG , UAG and UCG
- UAA , UAG and UGA
- UUG , UGC and UCA
- UCG , GCG and ACC
Q11 | RNA that picks up specific aminoacid from amino acid pool of cytoplasm to carry it to ribosome during protein synthesis is
- t RNA
- m RNA
- r RNA
- g RNA
Q12 | Correct sequenceof code transfer during polypeptide formation is (AIIMS -1999)
- DNA , mRNA , t RNA and amino acids
- DNA , t RNA , r RNA and m RNA
- m RNA , t RNA , DNA and amino acids
- r RNA , DNA ,m RNA and t RNA
Q13 | Best method to determine paternity is
- Protein analysis
- chromosome counting
- gene counting
- DNA finger printing
Q14 | DNA is copied from m-RNA molecule with help of
- Restriction enzyme
- Reverse transcriptase
- DNA polymerase
- Adenosine deaminase
Q15 | Nucleotide arrangement in DNA can be seen by
- X - ray crystallography
- Electron microscope
- Ultra centrifuge
- Light microscope
Q16 | Pneumococcus experiment proved that (AFMC - 1993)
- Bacteria do not reproduce asexuallly
- Bacteria undergo binary fission
- DNA is genetic material
- RNA may sometimes control a production of DNA and protein
Q17 | A DNA nucletotide chain has A G C T T C G A sequence The nucleotide sequence of other chain would be
- T C G A A G C T
- G C T A A G C T (AFMC - 1993)
- T A G C A T A T
- G A T C C T A G
Q18 | A functional unit in synthesis of protein is (MPPMT - 1994)
- Lysosome
- Peroxisome
- Polysome
- Dictyosome
Q19 | VNTR is employed for (AMU - 2002)
- Protoplasmic culture
- DNA finger printing
- Regulation of plant growth hormones
- Enhancing photosynthesis in desert plant
Q20 | Out of 64 codons 61 code for 20 types of aminoacids It is due to (CBSE - 2002)
- Overlapping genes
- Degeneracy of genetic code
- Wobbling of codons
- Universality of codons
Q21 | Okazaki fragments are joined by enzyme (Kerala 2005)
- DNA helix
- DNA ligase
- DNA polymerase II
- RNA polymerase II
Q22 | Heat killed pathogenic cells and live non pathogenic cells are mixed and injected into MiceThe result would be (Kerala - 2001)
- Mice develop disease and die
- Mice die without developing disease
- Mice remain healthy
- 50% mice develop discease and die
Q23 | Generally Cockroach is .......... or .......... colored insect, however in tropical regions, they havebeen reported to be .........., .......... and .......... colored.
- Brown or red, Yellow, Green and White
- Brown or Black, Yellow, Red and Green
- Brown or Yellow, Red, Green and White
- Red or Yellow, Brown, Green and Black
Q24 | In case of common species of Cockroach, Morphologically which statement is correct ?
- The size of female is slightly bigger than male.
- In both male and female, numbers of abdominal segments are different.
- The size of male and female are equal.
- The size of male is slightly bigger than female.
Q25 | Head of the Cockroach is formed by the fusion of .......... segments.
- Six
- four
- two
- eight