Description : The role of molecular chaperones is to A-facilitate binding of ribosomes to mRNA B-degrade newly synthesized polypeptides that contain inaccurate sequences C-.facilitate binding of RNA polymerase to DNA D-aid a newly synthesized polypeptide in folding to its proper shape
Last Answer : -aid a newly synthesized polypeptide in folding to its proper shape
Last Answer : aid a newly synthesized polypeptide in folding to its proper shape
Description : In the regulation of genes: a. more than 90% of the base sequences in human DNA have not known function b. extrons are the part of the gene that code for amino acids found in the final proteins. c. introns usually begins with the nucleotide sequence GT d. all above
Last Answer : all above
Description : What is the term used for a segment of DNA with one or more genes in the centre and the twoends carrying inverte d repeat sequences of nucleotides? A- Plasmid B- Transposon C- Insertion sequence D- None of these
Last Answer : Transposon
Description : Cistron is a) The coding sequence of DNA b) The functional unit of DNA molecule that codes for a particular gene product c) Intervening non coding sequence of DNA d) The sequences which are removed during RNA splicing.
Last Answer : b) The functional unit of DNA molecule that codes for a particular gene product c) Intervening non coding sequence of DNA
Description : What is antisense technology? (a) When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene (b) RNA polymerase producing DNA (c) A cell displaying a foreign antigen used for synthesis of antigens (d) Production of somaclonal variants in tissue cultures
Last Answer : (a) When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene
Description : All of the following statements about eukaryotic promoters are true except (A) They may be located upstream or down stream from the structural gene (B) They have two consensus sequences ( ... (D) Mutations in promoter region can decrease the efficiency of transcription of the structural gene
Last Answer : Answer : A
Description : A group of genes whose activity is coordinated by a DNA site is – (1) operon (2) cistron (3) polysome (4) polypeptide
Last Answer : (1) operon Explanation: The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon is a functioning unit of genomic DNA containing a cluster ... together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Description : A group of genes whose activity is coordinated by a DNA site is called: (1) operon (2) cistron (3) polysome (4) polypeptide
Last Answer : operon
Description : Besides structural genes that encode proteins, DNA contains some regulatory sequences which are known as (A) Operons (B) Cistrons (C) Cis-acting elements (D) Trans-acting factors
Last Answer : Answer : C
Description : Proto-oncogenes are: B A. DNA sequences in cells that are oncogenes themselves B. Cellular copies of genes that were first found in oncogenic retroviruses C. DNA viral sequences that are known to infect human cells D. Bacterial DNA counterparts
Last Answer : Cellular copies of genes that were first found in oncogenic retroviruses
Description : The eukaryotic genome differs from the prokaryotic genome because (a) the DNA is complexed with histone in prokaryotes (b) the DNA is circular and single stranded in prokaryotes (c) repetitive sequences are present in eukaryotes (d) genes in the former case are organised into operons.
Last Answer : (b) the DNA is circular and single stranded in prokaryotes
Description : The primary structure of a protein refers to : (a) whether the protein is fibrous or globular (b) the amino acid sequence in the polypeptide chain (c) the orientation of the amino acid side chains in space (d) the presence or absence of an α-helix
Last Answer : the amino acid sequence in the polypeptide chain
Description : Restriction endonucleases can recognise (A) Palindromic sequences (B) Chimeric DNA (C) DNA-RNA hybrids (D) Homopolymer sequences
Description : Satellite DNA contains (A) Highly repetitive sequences (B) Moderately repetitive sequences (C) Non-repetitive sequences (D) DNA-RNA hybrids
Description : At a chromosome replication fork, the lagging strand consists of__ That is joined by___. a. RNA sequences; DNA ligase b. Okazaki Fragments; RNA Polymerase c. RNA sequences; ribosomes d. Okazaki fragments; DNA ligase
Last Answer : d. Okazaki fragments; DNA ligase
Description : The regulatory i gene of lac operon (A) Is inhibited by lacotse (B) Is inhibited by its own product, the repressor protein (C) Forms a regulatory protein which increases the expression of downstream structural genes (D) Is constitutively expressed
Last Answer : Answer : D
Description : A DNA sequence that codes for a specific polypeptide
Last Answer : Ans. Cistron
Description : The genetic code operates via (A) The protein moiety of DNA (B) The base sequences of DNA (C) The nucleotide sequence of mRNA (D) The base sequence of tRNA
Description : 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
Last Answer : Answer : B
Description : Genes are (A) RNA (B) DNA (C) lipoproteins and (D) Chromoproteins
Description : The binding of prokaryotic DNA dependent RNA polymerase to promoter sites of genes is inhibited by the antibiotic: (A) Puromycin (B) Rifamycin (C) Terramycin (D) Streptomycin
Description : In RNAi, the genes are silenced using (a) ds-RNA (b) ss-DNA (c) ss-RNA (d) ds-DNA.
Last Answer : (a) ds-RNA
Description : Tobacco mosaic virus (TMV) genes are (a) single stranded RNA (b) double stranded DNA (c) proteinaceous (d) double stranded RNA.
Last Answer : (a) single stranded RNA
Description : _______ was first used to catalog organisms into one of three domains. a. Photosynthesis b. Ribosomal RNA genes c. Nuclear DNA genes d. Mitochondrial DNA genes
Last Answer : b. Ribosomal RNA genes
Description : Both DNA and RNA are composed of _______ a. polynucleotides b. genes c. polysaccharides d. polypeptides
Last Answer : a. polynucleotides
Description : The coding sequences in lac operon include (A) i gene (B) i gene, operator locus and promoter (C) z, y and a genes (D) i, z, y and a genes
Description : Introns in genes (A) Encode the amino acids which are removed during post-translational modification (B) Encode signal sequences which are removed before secretion of the proteins (C) Are the non-coding sequences which are not translated (D) Are the sequences that intervene between two genes
Description : In split genes, the coding sequences are called (a) exons (b) cistrons (c) introns (d) operons
Last Answer : (d) operons.
Description : In split genes, the coding sequences are called (a) exons (b) cistrons (c) introns (d) operons.
Last Answer : (a) exons
Description : Genomic islands are a. Gene Sequences Not Part Of The Chromosomal Genes. b. Adjacent Gene Sequences Unique To One Or A Few Strains In A Species. c. Acquired By HGT. d. Both B And C Are Correct.
Last Answer : d. Both B And C Are Correct.
Description : The coding sequences found in split genes are called a) Operons b) introns c) exons d) cistrons
Last Answer : c) exons
Description : 4. In split genes the coding sequences are called (a)introns (b)operons (c)exons (d)cistrons
Last Answer : (c)exons
Description : 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 ... sequenceof a gene D- Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide
Last Answer : Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide
Description : 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 ... of a Gene D- Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide
Description : A complex of ribosomes attached to a single strand of RNA is known as (a) polypeptide (b) Okazaki fragment (c) polysome (d) polymer.
Last Answer : (b) Okazaki fragment
Description : .A complex of ribosomes attached to a single strand of RNA is known as (a) polypeptide (b) Okazaki fragment (c) polysome (d) polymer
Last Answer : (c) polysome
Description : Template-directed DNA synthesis occurs in all the following except (A) The replication fork (B) Polymerase chain reaction (C) Growth of RNA tumor viruses (D) Expression of oncogenes
Description : Template-directed DNA synthesis occurs in all the following except (A) The replication fork (B) Polymerase chain reaction (C) Growth of RNA tumor viruses (D) Expression of oneogenes
Description : Which one of the following binds to specific nucleotide sequences that are upstream and most distant from the start site? (A) RNA polymerase (B) Repressor (C) Inducer (D) Restriction
Description : Which one of the following binds to specific nucleotide sequences? (A) RNA polymerase (B) Repressor (C) Inducer (D) Restriction
Description : All of the following statements about bacterial promoters are true except (A) They are smaller than eukaryotic promoters (B) They have two consensus sequences upstream from the transcription star site (C) ... is the site for attachment of RNA polymerase (D) TATA box has a high melting temperature
Description : RNA transcription is more complex in eukaryotes because it is first made as a primary RNA transcript that contains intron and exon sequences. What kind of modification must occur to produce a mature mRNA?
Last Answer : RNA splicing. Introns must be removed and exons are spliced together to form a mature RNA transcript.
Description : Which sequence of RNA bases with pair up with a strand of DNA bases that reads TACTGCA?
Last Answer : color
Description : The genetic code operates through (A) The protein moiety of DNA (B) Cistrom of DNA (C) Nucleotide sequence of m RNA (D) The anticodons of tRNA
Description : A consensus sequence on DNA, called TATA box, is the site for attachment of (A) RNA-dependent DNA polymerase (B) DNA-dependent RNA polymerase (C) DNA-dependent DNA polymerase (D) DNA topoisomerase II
Description : Restriction endonucleases recognize and cut a certain sequence of (A) Single stranded DNA (B) Double stranded DNA (C) RNA (D) Protein
Description : Termination of the synthesis of the RNA molecule is signaled by a sequence in the template strand of the DNA molecule, a signal that is recognized by a termination protein, the (A) Rho (ρ) factor (B) σ factor (C) δ factor (D) ε factor
Description : During transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at that point. What is that sequence called? (a) AAAT box (b) TATA box (c) GGTT box (d) CAAT box
Last Answer : (c) GGTT box