'DNA replication is semi-conservative'. Explain.

What are forces holds the two strands of DNA together in a double-helix structure? Draw structure to show the bonding between adenine and thymine, and between guanine and cytosine.

Explain the following:
Glucose responds Fehling solution and osazone, it does not react with Schiff’s base and sodium bisulphite.

Which vitamin is called ascorbic acid? What are its physiological functions? Which disease is caused by the deficiency of this vitamin?

Explain the following:
Although fructose does not have an aldehydic group, it reacts with Fehling solution.

What is melting temperature (T_m) of DNA? A DNA molecule with more number of GC base pairs than AT base pairs has higher T_m than the one with lesser number of GC base pairs than AT base pairs. Explain why?

Explain the following:
Glucosides react neither with Fehling solution nor with Tollen's reagent. They also do not allow mutarotation.

What is transcription with reference to protein synthesis? How does it take place?