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.
| 1. | Densely packed and transcriptionally inactive |
| 2. | Lightly packed and rich in ribosomes |
| 3. | Site of active gene transcription |
| 4. | Composed entirely of RNA |
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. DNA → RNA → Protein
2. Protein → RNA → DNA
3. RNA → DNA → Protein
4. DNA → Protein → RNA
| 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. |
| 1. | Histones are a set of positively charged, basic proteins. |
| 2. | Histones are rich in the basic amino acid residues lysine and arginine. |
| 3. | Histones are organised to form a unit of eight molecules called histone octamer. |
| 4. | The positively charged DNA is wrapped around the positively charged histone octamer to form a structure called centrosome. |
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