Tag: dna structure and replication

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Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

Correct sequence of code transfer during polypeptide formation is

  1. DNA, mRNA, tRNA and amino acids

  2. DNA, tRNA, rRNA and mRNA

  3. mRNA, tRNA, DNA and amino acids

  4. rRNA, DNA, mRNA and tRNA
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The central dogma of molecular biology describes the flow of genetic information: DNA is transcribed into mRNA, which is then translated into a polypeptide chain using tRNA and amino acids.

Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

Bacteriophage with radioactivity both in DNA and protein infects a bacterium. Bacterium becomes radioactive. Radioactivity occurs in

  1. Protein

  2. DNA

  3. All parts

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the Hershey-Chase experiment, the bacteriophage injects its DNA into the bacterium while the protein coat remains outside. Since the bacterium becomes radioactive, it confirms that the DNA, which carries the radioactive label, was successfully transferred into the host.

Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

DNA was proved to be genetic material through experiment of

  1. Transduction

  2. Replica experiment

  3. Viral infection of Tobacco

  4. Transformation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frederick Griffith's experiment with Streptococcus pneumoniae demonstrated that a 'transforming principle' could change non-virulent bacteria into virulent ones, which was later identified as DNA.

Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

From their experiments on Neurospora crassa, Beadle and Tatum proposed

  1. One gene one polypeptide hypothesis

  2. One gene one enzyme hypothesis

  3. One gene one function hypothesis

  4. Many genes one enzyme hypothesis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Beadle and Tatum studied nutritional mutants in the bread mold Neurospora crassa. Their work led to the 'one gene, one enzyme' hypothesis, stating that each gene is responsible for the synthesis of a specific enzyme.

Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

Which is correctly matched ?

  1. Frederick Griffith - Discovered transformation

  2. Linus Pauling - Isolated DNA for first time

  3. Francis Crick - Proposed one gene - one polypeptide hypothesis

  4. George Beadle - Proposed concept of inborn errors

  5. Jacob and Monod Proposed Wobble hypothesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Frederick Griffith is correctly credited with the discovery of bacterial transformation in 1928. The other options contain historical inaccuracies regarding the scientists or their specific contributions.

Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

Find out the correct options
1. Amino acids may have more than one codon
2. All amino acids have more than one codon
3. Codons are common for higher and lower organisms
4. Codons are not found in bacteria

  1. 1, 2, 3 correct

  2. 1, 2 correct

  3. 2, 4 correct

  4. 1, 3 correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement 1 is correct because the genetic code is degenerate (multiple codons for one amino acid). Statement 3 is correct because the genetic code is nearly universal. Statement 2 is false because some amino acids like methionine have only one codon. Statement 4 is false because bacteria use the same codon system.