The Shine-Dalgarno sequence is A- trailer sequence B- a stop codon C- the reading frame of a gene D- a short sequence that acts as a ribosomal binding site

The Shine-Dalgarno sequence is
A- trailer sequence
B- a stop codon
C- the reading frame of a gene
D- a short sequence that acts as a ribosomal binding site
by

1 Answer

Answer :

a short sequence that acts as a ribosomal binding site
by

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Last Answer : a short sequence that acts as a ribosomal binding site

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Bacteria become erythromycin resistant by the following mechanisms except: A. Becoming less permeable to erythromycin B. Elaborating an erythromycin esterase enzyme C. Elaborating a ‘protection protein’ which blocks the erythromycin binding site D. Altering the ribosomal binding site through a methylase enzyme

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In the following partial sequence of mRNA, a mutation of the template DNA results in a change in codon 91 to UAA. The type of mutation is 88 89 90 91 92 93 94 GUC GAC CAG UAG GGC UAA CCG (A) Missene (B) Silent (C) Nonsense (D) Frame shit

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Last Answer : Answer : A

Which of the following statement is correct? A- The size and sequence of introns can be deduced from the cDNA sequence B- Restriction endonuclease can cleave ss and dsDNA both C- Restriction fragment length polymorphism (RFLP) is usually formed in coding sequenceof a gene D- Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide

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Which of the following statement is correct? A- The size and sequence of introns can be deduced from the cDNA sequence B- .Restriction endonuclease can cleave ss and dsDNA both C- Restriction fragment length polymorphism (RFLP) is usually formed in coding sequence of a Gene D- Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide

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Which one of the following statements is true? a. Plasmids are circular molecules of RNA. b. RNA replicates by a conservative method of replication. c. Deletions or insertions of a nucleotide in a gene will cause a reading frameshift during translation. d. Okazaki fragments are removed from a RNA before translation occurs.

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Tetracyclines inhibit binding of amino acyl tRNAs to (A) 30 S ribosomal subunits (B) 40 S ribosomal subunits (C) 50 S ribosomal subunits (D) 60 S ribosomal subunits

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Binding of formylmehtionyl tRNA to 30 S ribosomal subunit of prokaryotes is inhibited by (A) Streptomycin (B) Chloramphenicol (C) Erythromycin (D) Mitomycin

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eIF-1A and eIF-3 are required (A) For binding of amino acyl tRNA to 40 S ribosomal subunit (B) For binding of mRNA to 40 S ribosomal subunit (C) For binding of 60 S subunit to 40 S subunit (D) To prevent binding of 60 S subunit to 40 S subunit

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Tetracylin prevents synthesis of polypeptide by (A) Blocking mRNA formation from DNA (B) Releasing peptides from mRNA-tRNA complex (C) Competing with mRNA for ribosomal binding sites (D) Preventing binding of aminoacyl tRNA

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Initiation of protein synthesis begins with binding of (A) 40S ribosomal unit on mRNA (B) 60S ribosomal unit (C) Charging of tRNA with specific amino acid (D) Attachment of aminoacyl tRNA on mRNA

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The primary mechanism underlying the resistance of gram-positive organisms to macrolide antibiotics is (a) Methylation of binding sites on the 50S ribosomal subunit (b) Formation of esterases that hydrolyze the lactone ring (c) Increased activity of efflux mechanisms (d) Formation of drug-inactivating acetyltranferases (e) Decreased drug permeability of the cytoplasmic membrane

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Last Answer : Ans: A

The mechanism of antibacterial action of tetracycline involves (a) Binding to a component of the 50S ribosomal subunit (b) Inhibition of translocase activity (c) Blockade of binding of aminoacyl – tRNA to bacterial ribosomes (d) Selective inhibition of ribosomal peptidyl transferases (e) Inhibition of DNA–dependent RNA polymerase

Description : The mechanism of antibacterial action of tetracycline involves (a) Binding to a component of the 50S ribosomal subunit (b) Inhibition of translocase activity (c) Blockade of binding of ... (d) Selective inhibition of ribosomal peptidyl transferases (e) Inhibition of DNA-dependent RNA polymerase

Last Answer : Ans: C

Mutations in promoter regions of genes can cause (A) Premature termination of translation (B) Change in reading frame of downstream structural gene (C) Decreased efficiency of transcription (D) All of these

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What happens at the ribosome in the production of a protein? a. mRNA brings the codon b. tRNA brings the anticodon c. the amino acids are linked by polypeptide bonds d. translation e. all the above

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Last Answer : c. the amino acids are linked by polypeptide bonds

Which of the termination codon is called amber? A- UAA B- UAG C- UGA D- AUG

Description : Which of the termination codon is called amber? A- UAA B- UAG C- UGA D- AUG

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The nonsense codon(s) is/are A-UAG B-UAA C-UGA D-all of these

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Which of the termination codon is called amber? A- UAA B- UAG C- UGA D- AUG

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Last Answer : UAG

The nonsense codon(s) is/are A-UAG B-UAA C-UGA D-all of these

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mRNA is complementary to the nucleotide sequence of (A) Coding strand (B) Ribosomal RNA (C) tRNA (D) Template strand

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Last Answer : Answer : A

.The first phase of translation is (a) binding of mRNA to ribosome (b) recognition of DNA molecule (c) aminoacylation of tRNA (d) recognition of an anti-codon

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Last Answer : (d) recognition of an anti-codon.

The first phase of translation is (a) binding of mRNA to ribosome (b) recognition of DNA molecule (c) aminoacylation of tRNA (d) recognition of an anti-codon.

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Last Answer : c) aminoacylation of tRNA

In the process of transcription in bacterial cells (A) Initiation requires rho protein (B) RNA polymerase incorporates methylated bases in correct sequence (C) Both the sigma unit and core enzymes of RNA polymerase are required for accurate promotor site binding (D) Primase is necessary for initiation

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Last Answer : Answer : C

_____ cells have antibodies on their surface that perform receptor functions by binding to antigen (epitope).a. T b. B c. NK d. A-C are correct

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Last Answer : b. B

Antibody diversity results from a. Apoptosis. b. Antigenic shift. c. Somatic recombination. d. Complement binding.

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Clonal selection includes a. Antigen-receptor binding on B cells. b. Antibody secretion recognizing same epitope as on B cell receptors. c. Differentiation of B cells into plasma cells and memory cells. d. All the above (A—C) are correct.

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Last Answer : d. All the above (A—C) are correct.