Which is an essential amino acid? 
1. Serine
2. Aspartic acid
3. Glycine
4. Phenylalanine

The transfer RNA molecule in 3D appears 
1. L-shaped
2. E-shaped
3. V-shaped
4. S-shaped

Length of one turn of the helix in a B-form DNA is approximately 
1. 3.4 nm
2. 2 nm
3. 0.34 nm
4. 20 nm

ATP is a 
1. nucleotide
2. nucleosome
3. nucleoside
4. purine

Enzymes enhance the rate of reaction by 
1. forming a reactant-product complex
2. changing the equilibrium point of the reaction
3. combining with the product as soon as it is formed
4. lowering the activation energy of the reaction

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?