The famous double-helix model of DNA was proposed by Watson and Crick in ____ and they shared Nobel Prize for Physiology or Medicine in ________ for their effort.
1. 1951, 1971
2. 1943, 1963
3. 1953, 1962
4. 1969, 1972
Which of the following is a pyrimidine base found in DNA?
1. Adenine
2. Guanine
3. Uracil
4. Cytosine
The backbone of a polynucleotide chain is made of:
1. Sugar and nitrogenous bases
2. Phosphate and nitrogenous bases
3. Sugar and phosphate
4. Sugar, phosphate, and nitrogenous bases
According to Erwin Chargaff, for a double stranded DNA
1. The ratios between Adenine and Thymine, and , Guanine and Cytosine are constant and equals one.
2. The ratios between Adenine and Thymine, and , Guanine and Cytosine are constant but is not equal to one.
3. The ratios between Adenine and Guanine, and , Thymine and Cytosine are constant and equals one.
4. The ratios between Adenine and Guanine, and , Thymine and Cytosine are constant but is not equal to one.
Transcriptionally active chromatin is termed as:
1. Heterochromatin
2. Euchromatin
3. Prechromatin
4. Prochromatin
In Griffith experiment, which of the following bacterial strains were capable of causing pneumonia in mice?
1. Live R
2. Bacteria strain without polysaccharide coat
3. Heat Killed S
4. Live R without capsule and Heat Killed S
The unequivocal proof that DNA is the genetic material was provided by:
1. Avery, Macleod and McCarty
2. Hershey and Chase
3. Meselson and Stahl
4. Watson and Crick
DNA replication is correctly described as:
1. Semi-conservative and Continuous
2. Semi-conservative and Discontinuous
3. Conservative and Continuous
4. Semi-conservative and Semi-discontinuous
In a transcription unit, with respect to structural gene, the promoter is located:
1. Upstream and 5’
2. Upstream and 3’
3. Downstream and 5’
4. Downstream and 3’
Which of the following is not a stop codon?
1. UAA
2. UGA
3. UAC
4. UAG