Q. No.The bases of RNA are the same as those of DNA with the exception that RNA contains
(1) cysteine instead of cytosine.
(2) uracil instead of thymine.
(3) cytosine instead of guanine.
(4) uracil instead of adenine.
Which of the following strands of DNA would be the
complement strand to G-C-A-T-C-G?
(1) C-G-T-A-G-C
(2) G-G-A-T-G-C
(3) A-A-C-G-A-T
(4) T-T-G-C-T-A
1. ionic bonds between deoxyribose molecules
2. ionic bonds between phosphate groups
3. covalent bonds between nucleotide bases
4. hydrogen bonds between nucleotide bases
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 17%, A 16.5%,T32.5%
2. G 17%, A 33%,T 33%
3. G8.5%,A50%, T24.5%
4. G 34%,A 24.5%,T 24.5%
The base pairing in a double stranded DNA is correctly described as:
(1) Similar
(2) Identical
(3) Complementary
(4) Synergistic
1. Single-stranded helix.
2. A-DNA structure.
3. Double helix with antiparallel strands.
4. Parallel strands.
| 1. | is equal to the number of uracil bases. |
| 2. | is equal to the number of guanine bases. |
| 3. | is equal to the number of adenine bases. |
| 4. | cannot be predicted. |
In the DNA molecule
1. The proportion of adenine in relation of thymine varies with the organism
2. There are two strands which run antiparallel one in 5’ → 3’ direction and other in 3’ → 5’
3. The total amount of purine nucleotides and pyrimidine nucleotides is not run always equal
4. There are two strands which run paralled in the 5’ → 3’ direction.
| 1. | Adenine pairing with cytosine and guanine pairing with thymine. |
| 2. | Adenine pairing with thymine via two hydrogen bonds and guanine pairing with cytosine via three hydrogen bonds. |
| 3. | Thymine pairing with cytosine and adenine pairing with guanine. |
| 4. | Purines pairing with purines and pyrimidines pairing with pyrimidines. |
| 1. | The two strands of DNA are held together by hydrogen bonds between complementary bases. |
| 2. | Adenine pairs with Cytosine through three hydrogen bonds, while Guanine pairs with Thymine through two hydrogen bonds. |
| 3. | The two strands of DNA are antiparallel, meaning one strand runs in the 5’→3’ direction and the other in the 3’→5’ direction. |
| 4. | The sugar-phosphate backbone forms the structural framework of DNA, with bases projecting inside. |
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