SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Some mammals can synthesize their own ascorbic acid
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True
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False
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -In all cases so far studied, the inability to synthesize vitamin C is due to mutations in the L-gulono--lactone oxidase (GLO) gene which codes for the enzyme responsible for catalyzing the last step of vitamin C biosynthesis.
Detailed explanation-2: -Today, thousands of tons of vitamin C (l-ascorbic acid) is synthesized every year by the pharmaceutical industry.
Detailed explanation-3: -A majority of animals produce relatively high levels of ascorbic acid from glucose in liver (Fig 1). However, guinea pigs, fruit eating bats, apes and humans can not synthesize ascorbic acid due to the absence of the enzyme L-gulonolactone oxidase.
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