A prokaryotic ribosome is made up of ________ sub units. (A) 20 S and 50S (B) 30S and 50S (C) 30S and 60S (D) 20S and 50S

A prokaryotic ribosome is made up of ________ sub units. (A) 20 S and 50S (B) 30S and 50S (C) 30S and 60S (D) 20S and 50S
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AN Eukaryotic ribosome is made up of ________ sub unit. (A) 40S and 60S (B) 40S and 50S (C) 40S and 80S (D) 60S and 80S

Description : AN Eukaryotic ribosome is made up of ________ sub unit. (A) 40S and 60S (B) 40S and 50S (C) 40S and 80S (D) 60S and 80S

Last Answer : Answer : A

What are the Svedberg values for the subunits of the 70S ribosomes of E. colli? A- 40S and 30S B- 50S and 20S C- 50S and 30S D- .40S and 20S

Description : What are the Svedberg values for the subunits of the 70S ribosomes of E. colli? A- 40S and 30S B- 50S and 20S C- 50S and 30S D- .40S and 20S

Last Answer : 50S and 30S

During translation initiation in prokaryotes, a GTP molecule is needed in (a) formation of formyl-met-tRNA (b) binding of 30S subunit of ribosome with mRNA (c) association of 30S mRNA with formyl-met- tRNA (d) association of 50S subunit of ribosome with initiation complex.

Description : During translation initiation in prokaryotes, a GTP molecule is needed in (a) formation of formyl-met-tRNA (b) binding of 30S subunit of ribosome with mRNA (c) association of 30S mRNA with formyl-met- tRNA (d) association of 50S subunit of ribosome with initiation complex.

Last Answer : (c) association of 30S mRNA with formyl-met- tRNA

.During translation initiation in prokaryotes, a GTP molecule is needed in (a) formation of formyl-met-tRNA (b) binding of 30S subunit of ribosome with mRNA (c) association of 30S mRNA with formyl-met- tRNA (d) association of 50S subunit of ribosome with initiation complex.

Description : .During translation initiation in prokaryotes, a GTP molecule is needed in (a) formation of formyl-met-tRNA (b) binding of 30S subunit of ribosome with mRNA (c) association of 30S mRNA with formyl-met- tRNA (d) association of 50S subunit of ribosome with initiation complex.

Last Answer : (c) association of 30S mRNA with formyl-met- tRNA

Chloramphenicol inhibits bacterial protein synthesis by: A. Binding to 30S ribosome and inhibiting attachment of aminoacyl tRNA B. Binding to 50S ribosome and preventing peptide bond formation C. Binding to 50S ribosome and blocking translocation of peptide chain D. Binding to both 30S and 50S ribosome and inducing misreading of mRNA code

Description : Chloramphenicol inhibits bacterial protein synthesis by: A. Binding to 30S ribosome and inhibiting attachment of aminoacyl tRNA B. Binding to 50S ribosome and preventing peptide bond formation C. Binding to ... chain D. Binding to both 30S and 50S ribosome and inducing misreading of mRNA code

Last Answer : B. Binding to 50S ribosome and preventing peptide bond formation

How do people in their late 20s - 30s meet each other?

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ATP is required for (A) Fusion of 40S and 60S of ribosome (B) Accommodation tRNA amino acid in a site of ribosome (C) Movement of ribosome along mRNA (D) formation of tRNA amino acid complex

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GTP is not required for (A) Capping L of mRNA (B) Fusion of 40S and 60S of ribosome (C) Accommodation of tRNA amino acid (D) Formation of tRNA amino acid complex

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The most important mechanism by which tetracycline antibiotics exert antiimicrobial action is (a) They chelate Ca2+ ions and alter permeability of bacterial cell membrane (b) They bind to 30S ribosomes and inhibit bacterial protein synthesis (c) They bind to 50S ribosomes and interfere with translocation of the growing peptide chain in the bacteria (d) They interfere with DNA mediated RNA synthesis in bacteria

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Which binding is inhibited by pactamycin? A- Aminoacyl-tRNA to the A-site of 30S subunit B- Initiator-tRNA to 30S/40S initiation complexes C- Peptidyl t-RNA to the 50S subunit D- Formation of peptide bond in P site

Description : Which binding is inhibited by pactamycin? A- Aminoacyl-tRNA to the A-site of 30S subunit B- Initiator-tRNA to 30S/40S initiation complexes C- Peptidyl t-RNA to the 50S subunit D- Formation of peptide bond in P site

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The most important mechanism by which tetracycline antibiotics exert antimicrobial action is: A. They chelate Ca2+ ions and alter permeability of bacterial cell membrane B. They bind to 30S ribosomes and inhibit bacterial protein synthesis C. They bind to 50S ribosomes and interfere with translocation of the growing peptide chain in the bacteria D. They interfere with DNA mediated RNA synthesis in bacteria

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The two sub-units of ribosome remain united at a critical ion level of (a) magnesium (b) calcium (c) copper (d) manganese.

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The two sub-units of ribosome remain united at a critical ion level of (a) magnesium (b) calcium (c) copper (d) manganese.

Description : The two sub-units of ribosome remain united at a critical ion level of (a) magnesium (b) calcium (c) copper (d) manganese.

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After formation of a peptide bond, mRNA is translocated along the ribosome by (A) eEF-1 and GTP (B) eEF-2 and GTP (C) Peptidyl transferase and GTP (D) Peptidyl transferase and ATP

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A splice some contains all the following except (A) hnRNA (B) snRNAs (C) Some proteins (D) Ribosome

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The enzyme amino acyl tRNA synthetase is involved in (A) Dissociation of discharged tRNA from 80S ribosome (B) Charging of tRNA with specific amino acids (C) Termination of protein synthesis (D) Nucleophilic attack on esterified carboxyl group of peptidyl tRNA

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The function of a repressor protein in an operon system is to prevent synthesis by binding to (A) The ribosome (B) A specific region of the operon preventing transcription of structural genes (C) The RNA polymerase (D) A specific region of the mRNA preventing translation to protein

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In mammalian cells, ribosomal RNA is produced mainly in the (A) Nucleus (B) Nucleolus (C) Ribosome (D) Golgi apparatus

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The first amino acid incorporated in a polypeptide in a ribosome of a bacterium is (A) N formyl methionine (B) Methionine (C) Alamine (D) Glycine

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The first amino acid incorporated in a polypeptide in a ribosome of a human is (A) N formyl methionine (B) Methionine (C) Phenyl alanine (D) Hydroxy lysine

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A growing peptide in a ribosome can not be shifted to the adjacent ribosome because (A) It is firmly attached (B) It will get the amino acid cleaved (C) The gap between the ribosomes is too big for a shift (D) The adjacent ribosomes have different composition

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In mammalian cells rRNA is produced mainly in the (A) Endoplasmic reticulum (B) Ribosome (C) Nucleolus (D) Nucleus

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The most active site of protein synthesis is the (A) Nucleus (B) Ribosome (C) Mitochondrion (D) Cell sap

Description : The most active site of protein synthesis is the (A) Nucleus (B) Ribosome (C) Mitochondrion (D) Cell sap

Last Answer : B

The binding of prokaryotic DNA dependent RNA polymerase to promoter sits of genes is inhibited by the antibiotic: (A) Streptomycin (B) Rifamcin (C) Aueromycin (D) Puromycin

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Last Answer : Answer : B

In contrast to Eukaryotic mRNA, prokaryotic mRNA is characterized by (A) Having 7-methyl guanosine triphosphate at the 5’ end (B) Being polycystronic (C) Being only monocystronic (D) Being synthesized with introns

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Last Answer : Answer : A

Which of the following may be used as a cloning vector? (A) Prokaryotic plasmid(B) Lambda phage (C) Cosmid (D) All of these

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Diphtheria toxin inhibits (A) Prokaryotic EF-1 (B) Prokaryotic EF-2 (C) Eukaryotic EF-1 (D) Eukaryotic EF-2

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Last Answer : Answer : D