Q. No.| 1. | 1 | 2. | 3 |
| 3. | 2.5 | 4. | 2 |
Antiparallel strands of DNA molecules means:
| 1. | One strand turns clockwise |
| 2. | One strand turns anticlockwise |
| 3. | Phosphate groups of the two strands share the same position on their ends |
| 4. | Phosphate groups at the start of the DNA strands are in the opposite position |
If the DNA percentage of thymine is 20%, then what is the percentage of guanine?
| 1. | 20% | 2. | 40% |
| 3. | 30% | 4. | 60% |
The following ratio is generally constant for a given species:
| 1. | T + C / G + A | 2. | G + C / A+ T |
| 3. | A + C / T + G | 4. | A + G / C +T |
Which of the following statements is correct?
1. Adenine pairs with thymine through one H-bond.
2. Adenine pairs with thymine through three H-bonds.
3. Adenine does not pair with thymine.
4. Adenine pairs with thymine through two H-bonds.
Chargaff's rule states that in an organism:
| 1. | The amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C). |
| 2. | The amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C). |
| 3. | The amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G). |
| 4. | Amounts of all bases are equal. |
In the polynucleotide chain of DNA, a nitrogenous base is linked to the –OH of:
| 1. | 2'C pentose sugar | 2. | 3'C pentose sugar |
| 3. | 5'C pentose sugar | 4. | 1'C pentose sugar |
If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is bp, then the length of the DNA is approximately:
| 1. | 2.5 meters | 2. | 2.2 meters |
| 3. | 2.7 meters | 4. | 2.0 meters |
During transcription, if the nucleotide sequence of the DNA strand that is being coded is ATACG, then the nucleotide sequence in the mRNA would be:
1. TCTGG
2. UAUGC
3. UATGC
4. TATGC
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