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
Explain about the supply curve or supply schedule. The supply curve or schedule shows the total quantity of a good or a service supplied within aggregate, by whole sellers or f

Q. On which organelle of the cell structure does intracellular digestion depend? What is the chemical content of those organelles? Intracellular digestion take place by the act

Case scenario Mr Kit Lee, a 28-year-old unrestrained driver of a utility, was travelling on a highway at 100kph and swerved to miss road debris. He lost control and struck a tre

Draw a section of the microscopic structure of human retina and label any six parts in it. a)  Name the structure that determines the eye colour in humans. What is the normal f

COMPOSITION Proteins = 44-76%,  Lipids = 20-53%,      Carbohydrates = 1-8%,  (Protein-Lipid ratio = 0.8 : 1 to 4 : 1) Most of lipid are "Phospholipids" which are amphipat

Protein Digestion Enzymes that digest proteins are divided into two groups endopeptidases and exopeptidases according to site of their action in the protein molecule. Endopept

defitionce of vitamin d

What are living and nonliving reservoirs? Viruses are both living as well as non-living. They have reservoirs of genes. A one nucleotide is a unit of gene. Viral genes make use

explain the respiration that takes place in different organisms??

Explain the Flow or Recovery Period - Dietary Management for Burns? After 48 to 72 hours, fluids and electrolytes are reabsorbed into the general circulation and excess fluid i