Which the following names is appropriate for the sequence 5′-G/ANNAUG -3′ in a mammalian mRNA? (1) Shine-Dalgarno sequence (2) Kozak sequence (3) Internal ribosome entry Sites (4) Translation termination site […]
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CSIR NET Life Science Previous Year Questions and Solution on Molecular Biology
Budding Yeast Show Two Lag Phases When Grown on High Glucose
11. When budding yeast (a facultative anaerobe) is grown for a few days in medium containing high glucose it shows a growth pattern with two lag phases (see figure below). […]
CSIR NET Life Science Previous Year Questions and Solution on Molecular Biology
Peptidyl Transferase Activity in Prokaryotic Protein Synthesis
During protein synthesis in prokaryotes, the peptidyl transferase activity required for peptide bond is due to (1) ribosomal protein L26. (2) 16S ribosomal RNA. (3) 23S ribosomal RNA. (4) aminoacyltRNA. […]
CSIR NET Life Science Previous Year Questions and Solution on Molecular Biology
The Role of Lactose Permease and the Lac Operon
10 Two E.coli Culture A and B are taken. Culture A was earlier grown in the presence of optimum concentration of gratuitous inducer IPTG. Both the cultures are now used […]
CSIR NET Life Science Previous Year Questions and Solution on Molecular Biology
How E. coli Distinguishes Initiating and Internal Methionine Codons
During protein synthesis in E. coli the initiating methionine (AUG) and the internal methionine (AUG) codons of a given mRNA are distinguished by (1) fmet-tRNAf and met-tRNAm respectively (2) fmet-tRNAf , IF-2 versus […]
CSIR NET Life Science Previous Year Questions and Solution on Molecular Biology
Diauxic Growth in E. coli: How Glucose and Lactose Shape the Bacterial Growth Curve
9. A culture medium contains two carbon sources, one is preferred carbon source (glucose) and the second is a non-preferred source (lactose). Which one below is correct regarding the nature […]
CSIR NET Life Science Previous Year Questions and Solution on Molecular Biology
Which RNA Carries Peptidyl Transferase Activity
Which one Of the following RNAs possesses the peptidyl transferase activity? (1) tRNA (2) 2.5S rRNA (3) 16S rRNA (4) 23S rRNA Introduction […]
CSIR NET Life Science Previous Year Questions and Solution on Molecular Biology
Glucose Addition and Lac Operon Expression
8. E. coli cells are growing in a medium containing lactose but no glucose. Indicate the expression status of the lac operon if glucose is added to the culture. (1) […]
CSIR NET Life Science Previous Year Questions and Solution on Molecular Biology
Which Statement About Eukaryotic Translation Is NOT True?
Which one of the following statements about eukaryotic translation is NOT true? (1) ribosome binding site on mRNA is called Kozak consensus sequences. (2) initiatortRNA is tRNAf-met (3) initiator amino […]
CSIR NET Life Science Previous Year Questions and Solution on Molecular Biology
How β-Galactosidase Expression in E. coli Changes After Glucose Depletion in a Galactose Medium
7. E. coli is being grown in a medium containing both glucose and galactose. On depletion of glucose, expression of β-galactosidase will (1) remain unchanged (2) increase (3) decrease (4) […]
