Feedback inhibition of an enzymatic reaction is caused by 
1. end product
2. substrate
3. enzyme
4. rise in temperature

Due to the discovery of which of the following in 1980, the evolution was termed as RNA world? 
1. mRNA, tRNA, rRNA synthesize proteins
2. In some viruses, RNA is the genetic material
3. RNA have enzymatic property
4. RNA is not found in all cells

Most abundant organic compound on earth is 
1. Protein
2. Cellulose
3. Lipids
4. Steroids

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

1.	base-sugar-phosphate
2.	base-sugar-OH
3.
4.	sugar-phosphate

Which of the following is the simplest amino acid?

Which of the following statements regarding enzyme inhibition is correct?
1. Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
2. Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
3. Non-competitive inhibition of an enzyme can be overcome by adding large amounts of substrate
4. Non-competitive inhibitors often bind to the enzyme irreversibly

Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these
1. help in regulating metabolism
2. are exclusively synthesized in the body of a living organism
3. are conjugated proteins
4. enhance oxidative metabolism

The catalytic efficiency of two different enzymes can be compared by the
1. formation of the product
2. pH optimum value
3. Km value
4. molecular size of the enzyme

Telomerase is an enzyme which is a
1. repetitive DNA
2. RNA
3. simple protein    
4. ribonucleoprotein

An organic substance bound to an enzyme and essential for its activity is called
1. holoenzyme                 
2. apoenzyme
3. isoenzyme
4. coenzyme