The vitamin isolated from egg yolk by Kogl and Tonnis in $1943$ was

  • A
    Vitamin $K$
  • B
    Vitamin $M$
  • C
    Vitamin $H$
  • D
    Vitamin $B_9$

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Some $B$ vitamins are known as:

$A$ cofactor $(prosthetic\ group)$ is a part of a holoenzyme. It is:

Who discovered 'co-enzymes'?

Why is vitamin $B_1$ included in the human diet?

Which of the following is an iron-porphyrin coenzyme or cofactor?

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