EASY
Earn 100

Explain the experiment showed the Lederberg replica plating?

Important Questions on Molecular Basis of Inheritance

EASY
Chromosome is the condensed coiled structure of _____ structure.
MEDIUM
A molecule that can act as a genetic material must fulfill the traits given below, except
MEDIUM
Examine the diagram and identify the correction option.

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EASY

A student grew virus in three different media containing P32, S35 and DNAase separately and allow this virus to attack to E. coli. The series of observation made by the students are as follows:

a) P32 labelled phage particles were produced in E. coli.
b) S35 containing phage particles were produced E. coli.
c) Phage particles were observed in E. coli.

d) P32 was not observed in phage particles produced by E. coli.
e) S35 was not observed in phage particles produced by E. coli.

The correct observations are

MEDIUM
Choose the wrong statements from the given below
A) Lederberg and Tatum found that the bacterium donates entire genetic material to recipient
B) Ehrenberg established link between bacteria and infectious diseases
C) Pasteur showed about the significant changes of nature brought by bacteria
D) Griffith discovered recipient cells of bacteria acquire previous characters
MEDIUM
Identify the correct order of organization of genetic material from largest to smallest :
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A bacterial strain S was heat killed. Another strain R (living) was taken and mixed with this S strain. This mixture of S+R strains were injected into mice. Which of the following are observed by Griffith?

I. The cells of S strain were dead in dead mice.

II. The bacterial cells without polysaccharide coat are transformed into virulent strain in the injected mice.

II. Griffith could not find living S strain in the body of dead mice.

IV. Griffith could find living S strain in the body of dead mice.

The correct combination is:

MEDIUM
Choose the incorrect statements from the following:
A) A nitrogen base is linked to the sugar through peptide linkage to form a nucleoside.
B) A polynucleotide chain has free phosphate moiety at 5 end of sugar.
C) In RNA, nucleotide residue has an additional --OH group at 2nd the position of the ribose sugar.
D) It is observed that in DNA, the A: T ratio and C: G ratio are not constant all the time.
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The final proof for DNA as the genetic material came from the experiments of
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The transforming principle of Pneumococcus as found out by Avery, MacLeod and McCarty was
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In the bacteriophage experiments, Hershey and Chase demonstrated that DNA is the genetic material in
HARD
Write the conclusion drawn by Griffith at the end of his experiment with Streptococcus pneumoniae.
EASY
How many types of nucleic acids are found in living system?
HARD
Describe Frederick Griffith's experiment on Streptococcus pneumoniae. Discuss the conclusion he arrived at.
MEDIUM
Describe the various steps of Griffith's experiment that led to the conclusion of the 'transforming principle'.
HARD
In a series of experiments with Streptococcus and mice, F. Griffith concluded that R-strain bacteria had been transformed. Explain
EASY
In order to label the coat alone but not the nucleic acid, the bacteriophage should be grown on E. coli cells previously cultured on a medium containing