NEET

Cholesterol occurs predominantly in :

Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by

In DNA purine nitrogen bases are

Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?

Enzymes require optimum pH for maximal activity
Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures 80°-90°C
Enzymes are highly specific
Most enzymes are proteins but some are lipids

Which of the following sugar is not found in plants?

Bond between phosphate and sugar in a nucleotide is

One turn of the helix in a B-form DNA is approximately

Antiparallel strands of a DNA molecule means that

One strand turns anti-clockwise
The phosphate groups of two DNA strands, at their ends, share the same position
The phosphate groups at thestartof two DNA strands are in opposite position (pole)
one strand turns clockwise

The acidic character of DNA and RNA is due to

The high energy bonds of ATP are present between :

Solution

ATP is a universal energy carrier of living cells. It is a nucleotide. It consists of adenine and ribose with three phosphate groups attached to it. The hydrolysis of high energy terminal phosphate bond (O–P) releases energy(30.5 kJ mole^–1).

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