MRCP UK EXAMINATIONS

NEUROLOGY

MONONEUROPATHIES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why is Methycobal different from other vitamins B12:
A
Methycobal is vitamin B12 that contains CH3
B
Methycobal is a new and very effective vitamin B12
C
Methycobal is vitamin B12 which can be used anytime
D
Methycobal is a fast-acting vitamin B12
Explanation: 

Detailed explanation-1: -The key difference between methyl B12 and B12 is that methyl B12 has an adenosyl ligand in the vitamin B12 structure replaced by a methyl functional group, whereas B12 or vitamin B12 contains an adenosyl functional group attached to the metal center.

Detailed explanation-2: -There are two forms of vitamin B12 that you’re likely to come across – methylcobalamin and cyanocobalamin. Cyanocobalamin is the most commonly supplemented form of vitamin B12 and is chemically synthesised. Methylcobalamin is found in animal-based foods and is therefore obviously naturally occuring.

Detailed explanation-3: -Methylcobalamin is a naturally occurring form of vitamin B12 (also known as cobalamin). This vitamin plays essential roles in your body, including in DNA production, forming red blood cells, and ensuring your nervous system is functioning properly.

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