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