With reference to Proteins, consider the following statements:
1.They perform the essential function of helping our body grow and repair itself.
2.Amino acids are joined by peptide bonds to form proteins.
3.Enzymes and Hormones contain proteins.
Which of the statements given above is/are correct?

1 and 2 only

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2 and 3 only

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1 and 3 only

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1, 2 and 3

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Solution

The correct option is D 1, 2 and 3
 Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, responding to stimuli, providing structure to cells and organisms, and transporting molecules from one location to another.
Enzymes and Hormones are made up of proteins.

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Q. A peptide is a short chain of amino acids. The amino acids in a peptide are connected to one another in a sequence by bonds called peptide bonds. Typically, peptides are distinguished from proteins by their shorter length, although the cut-off number of amino acids for defining a peptide and protein can be arbitrary.
Peptides are generally considered to be short chains of two or more amino acids. Meanwhile, proteins are long molecules made up of multiple peptide subunits, and are also known as polypeptides. Proteins can be digested by enzymes (other proteins) into short peptide fragments. Among cells, peptides can perform biological functions. For example, some peptides act as hormones, which are molecules that when released from cells affect other areas of the body.
A decapeptide (Mol. Wt. 796 g/mol) on complete hydrolysis gives glycine (Mol. Wt. 75 g/mol), alanine and phenylalanine. Glycine contribute 47% to the total weight of the hydrolyzed product.The number of glycine units in the decapeptide is:

Q. Read the given paragraph and write answers of the following questions.
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α -

amino acids. A definite sequence of amino acids form a specific protein. Two or more than two amino acids bind to give peptide bond. Proteins are polypeptide, which loses its biological activity by physical or chemical changes.
(A) Explain essential and non-essential amino acid with example.
(B) Explain denaturation of protein.

Enzymes are proteins. Proteins are long chains of amino acids linked to each other by peptide bonds. Amino acids have many functional groups in their structure.

These functional groups are many of them at least, ionisable. As they are weak acids and bases in chemical nature, this iohisation is influenced by pH of the solution. For many enzymes, activity is influenced by surrounding pH. This is depicted in the curve below, explain briefly.

Q. Consider the following statements.

Enzymes and protein can be correlated with each other in the following ways:
1. All proteins are enzymes.
2. All enzymes are proteins.
3. All enzymes are not protein.
4. All protein are not enzymes.
Which of the statements given above are correct?

Q. Consider the following statements:
1. On hydrolysis, proteins give amino acids.
2. The coagulation of protein is called denaturing.
3. A protein is best described as a polypeptide.
Which of the statements given above is/are true?

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With reference to Proteins, consider the following statements: 1.They perform the essential function of helping our body grow and repair itself. 2.Amino acids are joined by peptide bonds to form proteins. 3.Enzymes and Hormones contain proteins. Which of the statements given above is/are correct?

With reference to Proteins, consider the following statements:
1.They perform the essential function of helping our body grow and repair itself.
2.Amino acids are joined by peptide bonds to form proteins.
3.Enzymes and Hormones contain proteins.
Which of the statements given above is/are correct?