Practice free Molecular Basis of Inheritance (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Hind II always cuts DNA molecules at a particular point called recognition sequence and it consists of:
Hind II recognition sequence is 6 bp (GTY↓RAC).
A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and down stream end:
A transcription unit = promoter (upstream) — structural gene — terminator (downstream).
The DNA present in chloroplast is:
Chloroplast (and mitochondrial) DNA is circular and double-stranded — like prokaryotic DNA.
Which of the following statement is correct regarding the process of replication in E. coli?
All known DNA polymerases extend the new strand strictly in the $5' \to 3'$ direction.
Match List I with List II.
| List I | List II |
|---|---|
| A. Frederick Griffith | I. Genetic code |
| B. Francois Jacob & Jacque Monod | II. Semi-conservative mode of DNA replication |
| C. Har Gobind Khorana | III. Transformation |
| D. Meselson & Stahl | IV. Lac operon |
Choose the correct answer from the options given below:
Griffith — transformation; Jacob & Monod — lac operon; Khorana — genetic code; Meselson & Stahl — semi-conservative replication.
Given below are two statements:
Statement I: In the RNA world, RNA is considered the first genetic material evolved to carry out essential life processes. RNA acts as a genetic material and also as a catalyst for some important biochemical reactions in living systems. Being reactive, RNA is unstable.
Statement II: DNA evolved from RNA and is a more stable genetic material. Its double helical strands being complementary, resist changes by evolving repairing mechanism.
In the light of the above statements, choose the most appropriate answer:
Both statements correctly describe the RNA-world hypothesis and the subsequent evolution of the more stable, self-repairing DNA.
Which chromosome in the human genome has the highest number of genes?
Chromosome 1, the largest human chromosome, carries the maximum number of genes (~2968); the Y chromosome has the fewest.
Given below are two statements:
Statement I: Transfer RNAs and ribosomal RNA do not interact with mRNA.
Statement II: RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence.
In the light of the above statements, choose the most appropriate answer:
tRNA and rRNA do interact with mRNA during translation, so Statement I is incorrect. RNAi is a conserved cellular defence in eukaryotes, so Statement II is correct.
Which of the following are the post-transcriptional events in a eukaryotic cell? A. Transport of pre-mRNA to cytoplasm prior to splicing. B. Removal of introns and joining of exons. C. Addition of methyl group at 5' end of hnRNA. D. Addition of adenine residues at 3' end of hnRNA. E. Base pairing of two complementary RNAs. Choose the correct answer:
Post-transcriptional processing of hnRNA = splicing (B), 5′ capping (C) and 3′ poly-A tailing (D). pre-mRNA is processed before, not after, leaving the nucleus (A wrong); E is unrelated.
Match List I with List II:
List-I — A. Alfred Hershey and Martha Chase, B. Euchromatin, C. Frederick Griffith, D. Heterochromatin
List-II — I. Streptococcus pneumoniae, II. Densely packed and dark-stained, III. Loosely packed and light-stained, IV. DNA as genetic material confirmation
Choose the correct answer:
Hershey & Chase → confirmed DNA as genetic material (IV); Euchromatin → loosely packed, light-stained (III); Griffith → Streptococcus pneumoniae transformation (I); Heterochromatin → densely packed, dark-stained (II).
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