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Question
Solution
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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RELATED QUESTIONS
Correct the following statement if there is any mistake.
The four nitrogenous bases in the DNA are Guanine, Thiamine, Adrenaline and Cytosine.
State whether the following sentence is true or false:
Each spiral of the DNA has 12 nucleotides.
Choose the correct answer :
Spirally coiled double strands are observed in ____________
Give Technical Term:
The individual having similar pair of genes.
Complete the following sentence with appropriate word:
A chromosome is composed of 50 % DNA and 50% ________.
New nucleotides are added and a new complementary strand of DNA is formed with the help of enzyme DNA polymerase.
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 |
Which of the following enzyme catalyse the removal of nucleotides from ends of DNA?
