Chargaff's Rule

Q. State whether true or false:
The ratio A+T/G+C remains constant for a particular species.

1. True
2. False

Q. Which of the following is NOT true with regard to Chargaff’s rules?

1. A+T : G+C = 1:1
2. A:T = 1:1
3. G:C =1:1
4. A+G : T+C = 1:1

Q. In a DNA, the percentage of thymine is 20 %, then what is the percentage of guanine?

1. $20\%$
2. $30\%$
3. $60\%$
4. $40\%$

Q. In DNA of certain organisms, guanine constitutes $20\%$ of the bases. What percentage of the bases would be adenine?

1. $10\%$
2. $30\%$
3. $40\%$
4. $20\%$

Q. The following ratio is generally constant for a given species:

1. A+G/T+C
2. G+C/A+T
3. A+C/T+G
4. None of the above

Q. In sea urchin DNA, which is double stranded, $17\%$ of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are:

1. G - 34 %, A - 24.5 %, T - 24.5 %
2. G - 17 %, A - 33 %, T - 33 %
3. G - 17 %, A - 16.5 %, T - 32.5 %
4. G - 8.5 %, A - 50 %, T - 24.5 %

Q. Which is not correct according to Chargaff's rule?

1. $\frac{A+G}{C+T}=1$
2. $A+T=C+G$
3. $A+G=C+T$
4. Purines=Pyrimidines

Q. Which one of the following is not applicable to RNA?

1. Complementary base pairing
2. 5' phosphoryl and 3' hydroxyl ends
3. Chargaff's rule
4. Heterocyclic nitrogenous bases

Q.

If a DNA sample contain 23.8% cytosine resedues, then amount of thymine present in the same DNA sample is

1. 23.8%

2. 50%

3. 26.2%

4. 25%

Q. The complementary DNA strand for ATGGCTTGCAATGCT is

1. TACCGAACGTTACGC
2. TACCGAACGATACGA
3. TACCGAACGTTACGA
4. TACCGACCGTTACGA