Description : If the codon UAC on mRNA changes into UAG as a result of a base substitution in DNA, it will result in (A) Silent mutation (B) Acceptable mis-sense mutation (C) Nonsense mutation (D) Frameshift mutation
Last Answer : Answer : C
Description : Substitution of a base can result in a (A) Silent mutation (B) Mis-sense mutation (C) Nonsense mutation(D) All of these
Last Answer : Answer : D
Description : 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
Last Answer : Answer : B
Description : Haemoglobin S is an example of a/an (A) Silent mutation (B) Acceptable mis-sense mutation (C) Unacceptable mis-sense mutation (D) Partially acceptable mis-sense mutation
Description : Amino acid sequence of the encoded protein is not changed in (A) Silent mutation (B) Acceptable mis-sense mutation (C) Both (A) and (B) (D) None of these
Last Answer : Answer : A
Description : A point mutation results from (A) Substitution of a base (B) Insertion of a base (C) Deletion of a base (D) All of these
Description : Substitution of a thymine base by adenine in DNA is known as ((A) Transposition (B) Transition (C) Transversion (D) Frameshift mutation
Description : Substitution of an adenine base by guanine in DNA is known as (A) Transposition (B) Transition (C) Transversion (D) Frameshift mutation
Description : The most likely lethal mutation is (A) Substitution of adenine for cytosine (B) Insertion of one nucleotide (C) Deletion of three nucleotides (D) Substitution of cytosine for guanine
Description : .If the DNA codons are ATG ATG ATG and a cytosine base is inserted at the beginning, then which of the following will result? (a) CAT GAT GAT G (b) A non-sense mutation (c) C ATG ATG ATG (d) CA TGA TGA TG
Last Answer : (a) CAT GAT GAT G
Description : What is the Effect of substitution of base and codon?
Last Answer : A substitution is a mutation that exchanges one base for another. Such a substitution could: change a codon to one that encodes a different amino acid and cause a small change in the protein produced.
Description : Given below is a sample of a portion of DNA strand giving the base sequence on the opposite strands. What is so special shown in it? 5′ _____ GAATTC _____ 3′ 3′ _____ CTTAAG _____ 5′ (a) ... completed (b) Deletion mutation (c) Start codon at the 5′ end (d) Palindromic sequence of base pairs
Last Answer : (d) Palindromic sequence of base pairs
Description : All the following statements about recognition of a codon on mRNA by an anticodon on tRNA are correct except (A) The recognition of the third base of the codon is not very precise (B) ... degeneracy of the genetic code (D) Wobble results in incorporation of incorrect amino acids in the protein
Description : The nonsense codon(s) is/are A-UAG B-UAA C-UGA D-all of these
Last Answer : all of these
Description : Which enzyme will be produced in a cell if there is a nonsense mutation in the lac Y gene? (a) Transacetylase (b) Lactose permease and transacetylase (c) β-galactosidase (d) Lactose permease
Last Answer : β-galactosidase
Description : Which one of the following causes frame shift mutation? (A) Transition (B) Transversion (C) Deletion (D) Substitution of purine to pyrimidine
Description : Wobble position means a) Base paring b) altered base on code b) third altered base on codon d) none of the above
Last Answer : b) third altered base on codon
Description : Does nonsense have some sense or is it that some sense is nonsense?
Last Answer : the secret is deciding what makes sense out of all non-sense, and acting on it.
Description : .In the genetic dictionary, there are 64 codons as (a) 64 amino acids are to be coded (b) 64 types of tRNAs are present (c) there are 44 nonsense codons and 20 sense codons (d) genetic code is triplet.
Last Answer : (c) there are 44 nonsense codons and 20 sense codons
Description : In the genetic dictionary, there are 64 codons as (a) 64 amino acids are to be coded (b) 64 types of tRNAs are present (c) there are 44 nonsense codons and 20 sense codons (d) genetic code is triplet
Last Answer : genetic code is triplet
Description : The effect of a mis-sense mutation can be (A) Acceptable (B) Partially acceptable (C) Unacceptable (D) All of these
Description : Thalassemia is an example of – (1) Deletion mutation (2) Point mutation (3) Silent mutation (4) Frame shift mutation
Last Answer : (4) Frame shift mutation Explanation: Frame shift mutations are associated with Thalassemia. They involve a deletion or insertion of one' or two base pairs within a coding sequence of a gene. As ... and deletions, the reading frame of mRNA is altered resulting in a nonsense sequence of amino acids.
Description : Thalassemia is an example of (1) Deletion mutation (2) Point mutation (3) Silent mutation (4) Frame shift mutation
Last Answer : Frame shift mutation
Description : Retinoblastoma can result from a mutation in (A) ras proto-oncogene (B) erbB proto-oncogene (C) p 53 gene (D) RB 1 gene
Description : Which of the following statements concerning abnormalities of the haemoglobin molecule is true? 1) Alpha thalassaemia is due to a deficiency of beta-chain production 2) HbS is caused by a ... is an adverse prognostic sign 5) oliguneoclitide probes may assist in the diagnosis of haemoglobinopathies
Last Answer : Answers-2 Alpha Thalassaemia is due to abnormalities of the alpha chain. Persistence of HbF has survival advnatages in severely affected subjects. C-alpha 16, beta 11. e-Hb electrophoresis(Dr Shu Ho)
Description : Nonsense codons bring about (A) Amino acid activation (B) Initiation of protein synthesis (C) Termination of protein synthesis (D) Elongation of polypeptide chains
Description : Non-coding sequences in a gene are known as (A) Cistrons (B) Nonsense codons (C) Introns (D) Exons
Description : All of the following statements about nonsense codons are true except (A) They do not code for amino acids (B) They act as chain termination signals (C) They are identical in nuclear and mitochondrial DNA (D) They have no complementary anticodons
Description : Nonsense codons are present on (A) mRNA (B) tRNA (C) rRNA (D) None of these
Description : .Degeneration of a genetic code is attributed to the (a) first member of a codon (b) second member of codon (c) entire codon (d) third member of a codon.
Last Answer : (b) second member of codon
Description : Degeneration of a genetic code is attributed to the (a) first member of a codon (b) second member of codon (c) entire codon (d) third member of a codon.
Last Answer : d) third member of a codon.
Description : Put the following structures in order from smallest to biggest, Chromosome, Genome, Nucleotide Base, Codon, Gene, Cell Nucleus?
Last Answer : The order is nitrogenous base, nucleotide, codon, gene, chromosome, nucleus, and cell. :)
Description : Vector transformation followed by coordinate point substitution and vice-versa, both given the same result. Choose the best answer. a) Possible, when the vector is constant b) Possible, when the vector is variable c) Possible in all cases d) Not possible
Last Answer : a) Possible, when the vector is constant
Description : Increase in price of a product reduces the purchasing power as a result of which demand for a product goes up. This effect is known as (a) Substitution effect ; (b) Income effect ; (c) Diminishing marginal utility concept (d)Law of diminishing returns
Last Answer : ; (b) Income effect ;
Description : If the auditor learns that an entity is inappropriately using the auditor's name in association with financial information, he/she should: a. Remain silent. b. Seek legal advice if necessary. c ... known third party users of the inappropriate use of his/her name in connection with the information
Last Answer : Require management to cease doing so.
Description : The ribosome binding site A- forms a stem-loop structure in the RNA B- is located upstream of the promoter sequence C- .is located immediately upstream of the start codon D- is more likely to be associated with an operon than with a gene encoding a single protein
Last Answer : .is located immediately upstream of the start codon
Description : The rivosome binding site A- forms a sltem- loop structure in the RNA B- is located upstream of the promoter sequence C- is located immediately upstream of the start codon D- is more likely to be associated with an operon than with a gene encoding a single protein
Last Answer : is located immediately upstream of the start codon
Description : . Sickle-cell anaemia is (a) caused by substitution of valine by glutamic acid in the beta globin chain of haemoglobin (b) caused by a change in a single base pair of DNA (c) characterized by elongated sickle like RBCs with a nucleus (d) an autosomal linked dominant trait.
Last Answer : (b) caused by a change in a single base pair of DNA
Description : What purpose does FeCl3 serve in the electrophilic aromatic substitution reaction between chlorine and benzene? (a) It serves as a radical initiator to produce the chlorine radical needed to propagate the ... by reacting with the Cl2 and thereby activates it toward attack by benzene's π electrons.
Last Answer : It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.
Description : Which one of the following could NOT cause a change in the mRNA ―reading frame‖? a. Insertion Sequence b. Base-Pair Substitution c. Base Addition d. Base Deletion
Last Answer : b. Base-Pair Substitution
Description : If an acid is combined with a base of equal strength the result would most likely be?
Last Answer : The product of the reaction would most likely be a neutral salt.
Description : One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in (a) one-third of the progenies (b) none of the progenies (c) all the progenies (d) fifty percent of the progenies.
Last Answer : (b) none of the progenies
Description : Assume Samantha likes hot dogs and hamburgers equally, and the price of hamburgers (a normal good) declines. She will most likely purchase more hamburgers; this is (a) a reflection of the income ... substitution effect; (c) a reflection of the income and substitution effects ; (d) None of above
Last Answer : (b) a reflection the substitution effect;
Description : When no signal is being received, the loudspeaker is not entirely silent as a result of the presence of A. parasitic oscillations in some of the receiver stages. B. negative feedback in each stage. C. spurious frequencies as a result of improper neutralization. D. internal receiver noise.
Last Answer : D. internal receiver noise.
Description : Increasing skin cancer and high mutation rate are the result of
Last Answer : Increasing skin cancer and high mutation rate are the result of A. Acir rain B. Ozone depletion C. CO pollution D. `CO_(2)` pollution
Description : Why does frameshift mutation result in a nonfunctional protein?
Last Answer : What is the answer ?