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प्रश्न
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उत्तर
Features of DNA:
(a) DNA consists of two strands which are spirally arranged around an axis. This is called a double helical arrangement.
(b) Each DNA strand is made up of nitrogenous bases, pentose sugar and phosphate.
(c) Sugars are pentose type; bases are adenine, guanine, cytosine and thymine.
(d) Both strands are connected with hydrogen bonds. There are two bonds between adenine and thymine and three bonds between guanine and cytosine.
(e) In the DNA, bases are inside and sugars are outside and two sugars are connected with phosphoric acid.
(f) Each DNA strand replicates and from each replicated DNA a new DNA is formed. This is called replication of DNA.
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संबंधित प्रश्न
Choose the correct answer :
Adenine is a __________
Choose the correct answer :
RNA has uracil instead of ____________
Multiple Choice Question:
Place the following event of translation in the correct sequence
i. Binding of met-tRNA to the start codon.
ii. Covalent bonding between two amino acids.
iii. Binding of second tRNA.
iv. Joining of small and large ribosome subunits.
Down’s syndrome is a genetic condition with 45 chromosomes.
Match the Column I with Column II and select the correct option.
| List-I | List-II | ||
| i. | Ribozyme | a. | Lac operon |
| ii. | Friedrich Miescher | b. | DNS as genetic material |
| iii. | Alfred Hershey and Martha Chase | c. | Catalytic RNA molecule |
| iv. | Francois-Jacob | d. | DNA is acidic substance |
Through which of the following experiments DNA was proved to be the genetic material in E. coli and bacteriophage?
A DNA strand with the sequence AACGTAACG is transcribed. What is the sequence of the mRNA molecule synthesized?
Which of the following is not a component of a nucleotide?
