Question No:1
In the nucleus, the region of chromatin which is loosely packed is known as
[A] Heterochromatin
[B] Chromatin fibres
[C] Euchromatin
[D] Chromosome
Question No:2
Which is true about the structure of Heterochromatin?
[A] Loosely packed; Stain light
[B] Loosely packed; Stain dark
[C] Densely packed; Stain light
[D] Densely packed; Stain dark
Question No:3
Transformation experiments hi search of genetic material were performed by
[A] GJ. Mandel
[B] T.H. Morgan
[C] F. Griffith
[D] EH. Crick
Question No:4
Griffith carried out his experiments on mice using which pathogenic bacterium?
[A] Haemophilus influenza
[B] Corynebacterium diphtheria
[C] Streptococcus pneumonia
[D] Yersinia pestis
Question No:5
In Griffith’s experiment, heat killed S-strain when injected into mice resulted in _____.
[A] diseased condition only
[B] death only
[C] no disease or death
[D] Hybrid formation
Question No:6
The transforming principle in Griffith’s experiment was detected
[A] When live S-strain of S. pneumoniae were injected in R stain
[B] When live R-strain of S. pneumoniae were injected in S-strain
[C] When heat killed R-strain of S, pneumoniae were injected in S-strain
[D] When heat killed S-strain of S. pneumonia were injected in R-strain
Question No:7
Oswald Avery, Colin MacLeod and Maclyn Me Carry (1933 – 44) worked to determine the _____ nature of ‘transforming principle’ in Griffith’s experiment,
[A] physical
[B] morphological
[C] structural
[D] biochemical
Question No:8
RNA digesting enzymes are commonly known as
[A] Ribozymes
[B] Ribosomes
[C] R Nases
[D] Ribulose
Question No:9
What is the difference between DNAs and D Nase?
[A] Genetic material—DNA digesting enzyme
[B] DNA digesting enzyme—Genetic material
[C] Protein—Peptide
[D] None of the above
Question No:10
The experiment which provides unequivocal proof that DNA is genetic material came from the experiment of:
[A] Watson and Crick
[B] Wilkins and Franklin
[C] Hershey and Chase
[D] Avery, MacLeod and Maclyn Me Carty
Question No:11
In the Hershey-Chase experiments the following isotopes were used
[A] 32S, 30P
[B] 31S, 29P
[C] 35S, 32P
[D] 34S, 33P
Question No:12
The Hershey-Chase experiments show the following steps chronologically:
[A] Blending, Infection, Centrifugation
[B] Centrifugation, Infection, Blending
[C] Infection, Centrifugation, Blending
[D] Infection, Blending, Centrifugation
Question No:13
In Hershey-Chase experiments, 35S labelled _____ and 32P labelled _____ respectively,
[A] Bacteria, DNA
[B] DNA, Protein
[C] Protein, DNA
[D] DNA, mRNA
Question No:14
DNA is a preferred genetic material over RNA due to one of the following reasons
[A] Bases are arranged linearly in a single strand.
[B] Bases show less propensity of mutation.
[C] 2‘ OH group in RNA is more liable.
[D] None of the above
Question No:15
Which was the first genetic material?
[A] DNA
[B] RNA
[C] Proteins
[D] None
Molecular Basis of Inheritance Model Test-4
CategoriesNEET Biology