Haem group, Biology

Assignment Help:

Haem Group

A group of compounds called porphyrins are widely distributed in plants, animals and bacteria. Porphyrins associate with metals to form metalloporphyrins which form a variety of compounds. For example chlorophyll about which is a magnesium-porphyrin complex and cytochromes which contain porphyrin group play an important role in intracellular oxidation. When ferrous iron Fe++ is added to a porphyrin protoporphyrin IX, ferrous porphyrin or haem is formed. The molecular structure is shown in figure.  

1978_Haem Group.png

Figure:  Chemical structure of haem group (a), schematic representative of a single submit of haemoglobin (b).

The ferrous iron atom is bound to the four nitrogens of the protoporphyrin ring. The ferrous iron makes two more links, one with the oxygen atom to form oxyhaemoglobin and the other to the globin portion of the molecule at a single amino acid site.


Related Discussions:- Haem group

Circulatory system, Circulatory System Coelenterates and platyhelminth...

Circulatory System Coelenterates and platyhelminths nutrients in sponges, respiratory gases and waste materials can easily diffuse through the intercellular spaces. Though, in

Controlled hypothermia, Controlled Hypothermia Although birds and mamm...

Controlled Hypothermia Although birds and mammals frequently function in the homeothermic mode and maintain relatively high stable temperatures, many mammals and some birds ha

Define sample titration for estimation of reducing sugar, Define Sample Tit...

Define Sample Titration for Fehling Soxhlet Method Dilute the given sample glucose solution in 100 ml volumetric flask to the mark with distilled water. Pipette 5 ml of Fehling

Neuron, It arises from a one embryonic cell known as neuroblast Types of...

It arises from a one embryonic cell known as neuroblast Types of neuron:  According to number of process¬ (a) Unipolar: Only axon is there. e.g. mesencephalic nucleus. (b)

Blood be enhanced during vigorous activity, The percentage of oxygen absorb...

The percentage of oxygen absorbed from the air in the lungs is always about the similar, so how can the oxygen supply to the blood be enhanced during vigorous activity? Breathi

Why is carbon monoxide toxic for humans, Why is carbon monoxide toxic for h...

Why is carbon monoxide toxic for humans? Hemoglobin "likes" carbon monoxide (CO) much more than it likes oxygen. When there is carbon monoxide in the inhaled air it binds to he

Cooking of vitamin c-containing foods, Q. Why isn't the cooking of vitamin ...

Q. Why isn't the cooking of vitamin C-containing foods appropriate for vitamin C supply? To obtain vitamin C, for instance, from an orange dessert, the vitamin- containing food

Eye drops, Eye Drops Medication is instilled in the form of drops or ...

Eye Drops Medication is instilled in the form of drops or ointment.   Purpose To dilate pupil e.g. Atropine 1 per cent, drosyn 5 per cent or 10 per cent  To c

Respiration, explain the respiration that takes place in different organism...

explain the respiration that takes place in different organisms??

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd