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BARSIC [14]
3 years ago
13

True or false vitamin k is necessary for the absorption of vitamin B12 from the intestines

Biology
2 answers:
AleksAgata [21]3 years ago
8 0
False. Intrinsic Factor is necessary for absorption of B12 from the intestine.
Savatey [412]3 years ago
4 0

Answer:

False

Explanation:

Vitamin K is essential for the body. It helps in blood clotting, contributes to bone health and can be used in premature babies. However, it is not essential for the absorption of vitamin B12 from the intestine, this is the role of cyanocobalamin rather than vitamin K.

Vitamin K is essential for the body. It helps in blood clotting, contributes to bone health and can be used in premature babies. However, it is not essential for the absorption of vitamin B12 from the intestine. In the human body, the absorption of Vitamin B12 already starts in the mouth by saliva and continues until the end of the small intestine. In this process, several proteins are required for B12 uptake. Initially, R proteins secreted in saliva and gastric juice unite with it and accompany it to the duodenum, where pancreatic juice proteases break their bonds and allow their absorption.

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Answer:

Explanation:

The Genotype of the  woman is XCbXN

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Since the allele for the color blindness is carried on one of the X -chromosomes of the  carrier mother, then  the male children will be color blind or carrier deopending on the defective gene they inherited. Since they will receive the defective or normal  allele from the  mothers,but the female will carriers or normal because they will inherit either defective allele or normal allele from the mother,but normal  X allele from the father.

Assuming the colorbind gene was inherited by One of the boys, and the girls take the defective genes

1. XNY vs XCbXN.Then the one of the  boys will be colorblind  and the one of  girls will be carriers. XNXCb, XNXN, XCbY,XNY  50 %

2.If the two boys take the effective genes from the mothers. and none of the girls take the defective alelle

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The proportions that will be  the females  since the girls can only take the defective allele from one of the normal and defective allele from the mother. Assuming the girls  take the defective allele from the mothers and take normal from the father,they will all  be carriers,since the X of the father is normal.

They can not have a color blind girl.Since the father is normal It takes two colorblind X-chromosome to give a girl.

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