Chemistry of living matter, Biology

Chemistry of Living Matter
All living things including ourselves, are made of protoplasm. Protoplasm is essentiallya colloidal suspension of proteins in a w&ery solution. It is composed of molecules, the main element being carbon, which occurs in association with hydrogen, nitrogen and oxygen. Other elements like phosphorus, calcium, sodium etc. occur in small quantities. Table.

Table: Composition of elements in the earth's crust (the lithosphere) and the human body. Each number represents the percent of the total number of atoms present; for example 47 of every 100 atoms found in a representative sample of the earth's crust are oxygen atoms. Whereas there are only 19 atoms of carbon in every 10,000 atoms of the earth's crust. The four most abundant elements in the earth's crust are oxygen, silicon, aluminium and iron. While the four most abundant elements in Living organism are hydrogen, oxygen, carbon and nitrogen. So except for oxygen, in living organism, ,silicon, aluminium and iron occur only in traces. About 75% of the body of most animals is composed of water and 50% of the remaining dry weight is carbon with little if any silicon. The earth's crust in contrast, consists of 28% silicon and less than 0.1% carbon.

2427_Chemistry of Living Matter.png

This table compares the relative abundance of the most prevalent elements in the earth's crust with those in our body. As you can see from the table, living matter makes use of only very few of the elements available to it. Furthermore, the relative proportion of elements found in living organisms is different from that found in the environment. In other words, living matter can take up certain elements that are scarce in the nonliving environment and concentrate them within living cells.

Moreover, there is a rapid turnover of material in living things. For example, carbon is taken up in the form of sugar, and is given out in the form of carbon dioxide. You do not see the same carbon atom in an organism bemanently. Thus the organisation of atoms and molecules in living systems is more dynamic than in nonliving objects, such as rock. The rock we see today contains the same atoms it had last year. By contrast the rabbit we see today is largely composed of atoms acquired since we saw it last year.The carbon based compounds produced by living organisms can be divided broadly into carbohydrates, fats and proteins. These then get organized into structures - called cells which form the basic units involved in the specific organization of organisms.

Posted Date: 1/12/2013 2:00:38 AM | Location : United States







Related Discussions:- Chemistry of living matter, Assignment Help, Ask Question on Chemistry of living matter, Get Answer, Expert's Help, Chemistry of living matter Discussions

Write discussion on Chemistry of living matter
Your posts are moderated
Related Questions
Normal or General Diet This diet is planned to be  consistent with the  Recommended Dietary Allowances (RDAs) of  nutrients  and  is based  on  the food groups.  It  is  usuall

Chronic Pulmonary Thromboembolism :  The operation recommended is pulmonary thrombo endarterectomy. Indication :  The main indication for surgery is when patients with chroni

Influence of Associated Ions The second important factor influencing the plant uptake of a given cation is the effects of the ions held in association with it. For instance, as

Which are the three parts of the small intestine? The small intestine is separated into three portions: duodenum, jejunum and ileum. Digestion System - Image Diversity: smal

GROWTH CURVE - Sigmoid curve or stretched 'S' shaped curve is obtained showing - a - lag phase                              b - log phase c - in flaxion p

Explain Ailing Implant Which may indicate an increased risk for failure, which can be of temporary significance or amenable to treatment and is generally a soft tissue aberrati

Angiosperms  are the flowering plants. They first appeared at least 110 million years ago from the unknown gymnosperm ancestor, these flowering plants have risen to dominance in th

Q. Show technical aspects of the postero-anterior film? 1) Identification: Patient identification and side marker must be present. 2) Centering: The thoracic spinous pro

Why do organisms live in certain places? Think of that, the temperature dissimilarity in the desert is huge. So in order to survive, the cactus plant decreases heat gain and he

Name a few foods which are best blanched? Yes, green beans, carrots, okra, turnip and cabbage should always be blanched. On the other hand, blanching is not needed for onions,