Which of the following elements are present in all proteins? 1. Carbon 2. Hydrogen 3. Oxygen 4. Nitrogen

Which one of the following statements is not correct regarding the amino acids, tyrosine, present in protein rich food?

Vitamin 'C' help in absorption of which of following elements?

Which one of the following does not denature a protein?

Which one of the following metals is present in the vitamin B₁₂?

Which of the following is mostly carbohydrate?