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Molecular Basis Of Inheritance

394 Questions Start Allen Test
All Exams Allen
Q376 Allen ANALYTICAL QUESTIONS MCQ
In the DNA molecule :-
A.
the proportion of Adenine in relation to thymine varies with the organism
B.
there are two strands which run antiparallel one in 5' →3' direction and other in 3' → 5'
C.
the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
D.
there are two strands which run parallel in the 5' →3' direction
Q377 Allen ANALYTICAL QUESTIONS MCQ
Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid ?
A.
AUG,ACG - Start/Methionine
B.
UUA, UCA – Leucine
C.
GUU, GCU – Alanine
D.
UAG, UGA – Stop
Q378 Allen ANALYTICAL QUESTIONS MCQ
Which of the following bond is not related to nucleic acid ?
A.
H-bond
B.
Ester bond
C.
Glycosidic bond
D.
Peptide bond
Q379 Allen ANALYTICAL QUESTIONS MCQ
Haploids are more suitable for mutation studies than the diploids. This is because :-
A.
Haploids are more abundant in nature than diploids.
B.
All mutations, whether dominant or recessive are expressed in haploids.
C.
Haploids are reproductively more stable than diploids.
D.
Mutagens penetrate in haploids more effectively than in diploids.
Q380 Allen ANALYTICAL QUESTIONS MCQ
What is not true for genetic code ?
A.
It is unambiguous
B.
A codon in mRNA is read in a noncontiguous fashion
C.
It is nearly universal
D.
It is degenerate
Q381 Allen ANALYTICAL QUESTIONS MCQ
Removal of introns and joining the exons in a defined order in a transcription unit is called:-
A.
Capping
B.
Splicing
C.
Tailing
D.
Transformation
Q382 Allen ANALYTICAL QUESTIONS MCQ
Semiconservative replication of DNA was first demonstrated in :-
A.
Salmonella typhimurium
B.
Drosophila melanogaster
C.
Escherichia coli
D.
Streptococcus pneumoniae
Q383 Allen ANALYTICAL QUESTIONS MCQ
Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a "triplet" ?
A.
Beadle and Tatum
B.
Nirenberg and Matthaei
C.
Hershey and Chase
D.
Morgan and Sturtevant
Q384 Allen ANALYTICAL QUESTIONS MCQ
Point mutation involves :-
A.
Deletion
B.
Insertion
C.
Change in single base pair
D.
Duplication
Q385 Allen ANALYTICAL QUESTIONS MCQ
Select the two correct statements out of the four (a-d) given below about lac operon:
(a) Glucose or galactose may bind with the repressor and inactivated.
(b) In the absence of lactose the repressor binds with the operator region.
(c) The z-gene codes for permease.
(d) This was elucidated by Francois Jacob and Jacque Monod. The correct statements are :-
A.
(b) and (d)
B.
(a) and (b)
C.
(b) and (c)
D.
(a) and (c)
Q386 Allen ANALYTICAL QUESTIONS MCQ
Satellite DNA is useful tool in :-
A.
Forensic science
B.
Genetic engineering
C.
Organ transplantation
D.
Sex determination
Q387 Allen ANALYTICAL QUESTIONS MCQ
The one aspect which is not a salient feature of genetic code, is its being :-
A.
Universal
B.
Specific
C.
Degenerate
D.
Ambiguous
Q388 Allen ANALYTICAL QUESTIONS MCQ
Which one of the following does not follow the central dogma of molecular biology?
A.
Chlamydomonas
B.
HIV
C.
Pea
D.
Mucor
Q389 Allen ANALYTICAL QUESTIONS MCQ
PCR and Restriction Fragment Length Polymorphism are the methods for: -
A.
DNA sequencing
B.
Genetic fingerprinting
C.
Study of enzymes
D.
Genetic transformation
Q390 Allen ANALYTICAL QUESTIONS MCQ
What is it that forms the basis of DNA Fingerprinting?
A.
The relative amount of DNA in the ridges and grooves of the fingerprints.
B.
Satellite DNA occurring as highly repeated short DNA segments
C.
The relative proportions of purines and pyrimidines in DNA
D.
The relative difference in the DNA occurrence in blood, skin and saliva BMI202
Q391 Allen ANALYTICAL QUESTIONS MCQ
Read the following four statements (A-D):
(A) In transcription, adenosine pairs with uracil.
(B) Regulation of lac operon by repressor is referred to as positive regulation.
(C) The human genome has approximately 50,000 genes.
(D) Haemophilia is a sex-linked recessive disease. How many of the above statements are right?
A.
Four
B.
One
C.
Two
D.
Three
Q392 Allen ANALYTICAL QUESTIONS MCQ
Which one of the following is a wrong statement regarding mutations?
A.
UV and Gamma rays are mutagens
B.
Change in a single base pair of DNA does not cause mutation
C.
Deletion and insertion of base pairs cause frame-shift mutations.
D.
Cancer cells commonly show chromosomal aberrations.
Q393 Allen ANALYTICAL QUESTIONS MCQ
Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y-gene?
A.
Lactose permease and transacetylase
B.
β-galactosidase
C.
Lactose permease
D.
Catalase
Q394 Allen ANALYTICAL QUESTIONS MCQ
DNA fragments generated by the restriction endonucleases in a chemical reaction can be separated by :-
A.
Restriction mapping
B.
Centrifugation
C.
Polymerase chain reaction
D.
Electrophoresis