- Which one of the following is wrongly matched?
[CBSE AIPMT 2014]
(a)Transcription — Writing information from DNA to tRNA
(b)Translation — Using information in mRNA to make
protein
(c)Repressor — Binds to operator to stop enzyme
protein synthesis
(d)Operon — Structural genes, operator and promoter - Find the wrongly matched pair. [Kerala CEE 2014]
(a)Har Govind Khorana — Synthesised RNA
molecules chemically
(b)George Gamow — Codon is triplet
(c)Meselson and StahI —Regulation of gene expression
(d)Alec Jeffreys — DNA fingerprinting - A geneticist isolates a gene for a specific trait under
study. And also the corresponding mRNA. She found
that the mRNA contains 1000 fewer bases than the
DNA sequence. Did she isolate the wrong DNA?
(a)Yes, mRNA is made from DNA template and should be the
same length as DNA sequence.
(b)Yes, the mRNA should contain more bases than the DNA
sequence because bases flanking the gene are also
transcribed.
(c)No, the final mRNA contains only exons, the introns were
removed.
(d)No, the mRNA was partially degraded after it was
transcribed. - The newly synthesised mRNA undergoes few
modifications before undergoing translation. In the
absence of which of the changes it is unable to undergo
translation
(a) 5 ′ guanosine cap (b) poly A tail
(c) snRNPs (d) None of these - The DNA from the bacteriophage φ× 174 has a base
composition of 25% A. 33% T, 24% G and 18% C, which
of the following best explains this observation?
(a)In viral genomes, the base pairing does not follow the
standard Watson and Crick rules and allow G-A and C-T
base pairs
(b)Viral genomes are linear and tolerate base pair mismatches.
(c)Nucleic acids from viruses are rightly complexed with
nucleic acid binding proteins and so, cannot base pair
another
(d)The genome of bacteriophage φ× 174 is single-stranded- Which one of the following does not follow the central
dogma of molecular biology? [CBSE AIPMT 2010]
(a) Pea (b) Mucor (c) Chlamydomonas (d) HIV - hnRNA undergoes two additional processing. Out of
which, in one of them an unusual nucleotide (methyl
guanosine triphosphate) is added to the 5 ′ end of
hnRNA. This is known as [AIIMS 2009]
(a) capping (b) tailing (c) splicing (d) termination - Whose experiments cracked the DNA and discovered
unequivocally that genetic code is triplet?
[CBSE AIPMT 2009]
(a) Nirenberg and Matthaei (b) Hershey and Chase
(c) Morgan and Chase (d) Beadle and Tatum - The length of DNA molecule greatly exceeds the
dimensions of the nucleus in eukaryotic cells. How is
this DNA accommodated? [CBSE AIPMT]
(a) Deletion of non-essential genes
(b) Super coiling in nucleosomes
(c) DNAase digestion
(d) Through elimination of repetitive DNA
10 .Automated DNA sequencers, work on the principle of
the method developed by
(a) Erwin Chargaff (b) Maurice Wilkins
(c) Frederick Sanger (d) Alec Jeffreys
11 .During transcription RNA polymerase holoenzyme
binds to a gene promoter and assumes a saddle-like
structure. What is its DNA-binding sequence?
(a) TTAA (b) AATT (c) CACC (d) TATA
12 .The haploid content of human DNA is
(a) 3 3. × 106 bp (b) 3 3. × 109 bp
(c) 4 6. × 106 bp (d) 6 6. × 109 bp
13 .Alec Jeffreys developed the DNA fingerprinting
technique. The probe he used was
(a) ribozyme (b) sex chromosomes
(c) SNP (d) VNTR
MASTER
Answers
1.(c) 2.(c) 3.(d) 4.(a) 5.(a) 6.(d) 7.(c) 8.(d) 9.(a) 10.(c)
11.(d) 12.(b) 13.(c) 14.(a) 15.(c) 16.(b) 17.(c) 18.(c) 19.(b) 20.(d)
21.(c) 22.(c) 23.(a) 24.(a) 25.(d) 26.(a) 27.(b) 28.(c) 29.(d) 30.(d)
31.(c) 32.(c) 33.(b) 34.(c) 35.(b) 36.(a) 37.(b) 38.(a) 39.(d) 40.(b)
41.(d) 42.(d) 43.(d) 44.(c) 45.(a) 46.(b) 47.(a) 48.(b) 49.(c) 50.(b)
51.(a) 52.(c) 53.(b) 54.(c) 55.(c) 56.(c) 57.(d)Answers
1.(a) 2.(c) 3.(c) 4.(c) 5.(d) 6.(d) 7.(a) 8.(a) 9.(b) 10.(c)
11.(d) 12.(b) 13.(d)