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

5 kingdom system, what r the demerits of 5 kingdom classification?

what r the demerits of 5 kingdom classification?

Explain the sub-clinical protein energy malnutrition, Explain the Sub-clini...

Explain the Sub-clinical Protein Energy Malnutrition? You have already learnt that clinical forms of PEM represent only a small proportion of the total cases of PEM in a commun

General characteristics of protozoans, General Characteristics of Protozoan...

General Characteristics of Protozoans The protozoans, are eukaryotes that form a group of about 80,000 single-celled organisms under the kingdom Protista. The unicellular leve

Complications of short bowel syndrome, Q. Complications of short bowel synd...

Q. Complications of short bowel syndrome? Complications of short bowel syndrome are generally related to malnutrition. What are the complications of malnutrition? A person with

Explain sexual arousal mechanism in women, Q. How does the sexual arousal m...

Q. How does the sexual arousal mechanism in women facilitate fecundation? During sexual arousal in women the vagina secretes substances to neutralize its acidity thus allowing

What are the symptoms of diverticulosis, Q. What are the symptoms of divert...

Q. What are the symptoms of diverticulosis? Depending on the site of diverticula the symptoms may appear. It occurs most often in sigmoid colon and frequency increases with age

Define the need for classification of plants and animals, Define the Need f...

Define the Need for classification of Plants and Animals? First of all there is a need to know what classification is? Let us define in simple term. Classification is placing o

Thermodynamics and energy, Thermodynamics and Energy 2 types of en...

Thermodynamics and Energy 2 types of energy (kinetic and potential) Work is the transfer of energy from one place to another Energy isn't lost, only converted è fi

What are the plant root hairs, What are the plant root hairs? Where can the...

What are the plant root hairs? Where can they be found and what is their function? The root hairs are external elongated projections of the root epidermis. Their role is to

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