Which of the following statements is correct?

  • A
    There are only $2$ types of enzymes.
  • B
    There are many types of proteins.
  • C
    $DNA$ consists of only four types of molecules.
  • D
    There are $80$ types of chromosomes.

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How many types of amino acids are there in living organisms?

The simplest amino acid is

Between which groups is a dipeptide bond formed?

Which protein is present in the exoskeleton?

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