Enzymes, Biology

Assignment Help:

The Biological Catalysis Enzyme:

Biological catalysis  are called enzyme. An enzyme can be defined as an organic  substance that tremendously accelerates a chemical  reaction without changing  its  direction  and is neither  used up nor permanently  altered in the rection  so that it can  be sued  again  and again ,Enzyme  are dtudied under the branch enzymology  .First indication of the occurrence of enzymes in living systems was given  by Kirchhoff 1815 who prepared a wheat extract that could catalyze transformation of starch into sugar. There after Louis pastier 1860 discovered that  the fermentation of foodstuffs can be brought about by yeast cells .Kuhne 1878 discovered  that in fact  a ferment present in yeast cell.  Brings about  this fermentation .He called  this ferment  an enzyme presumably   about 3000 kinds  of enzymes  are required to catalyze  metavolic  reaction  in an ordinary cell. All ezymes  are synthesized   within   the cell  itself under genic  control, Scientists  have  so far  identified about 2000 enzymes . They  have however  ascertained that these enzyme can catalyze reactions even outside the cells . A few hundred  enzymes  have been extracted in pure form  and pure crystals  of many of these have been prepared. Buchner1897  was first to prepare a pure extract  of zymase enzyme from  yeast. The  Noble  laureate sumner 1926 first prepared  pure crystals of urease enzyme  from  jack beans Northrop 1930  gastric and  pancreatic juices .He also  postulated that chemically all enzymes are proteins.


Related Discussions:- Enzymes

What are the genotypes, What are the genotypes and respective blood types o...

What are the genotypes and respective blood types of the ABO system? Since the alleles are IA, IB and i the possible genotypes are IAIA (blood type A), IAIB (blood type AB), IB

How is the circulatory system of birds characterized, How is the circulator...

How is the circulatory system of birds characterized? Birds, as every vertebrate, have a closed circulatory system. The heart is same to the mammalian heart, having four chambe

Accumulation of phenylalanine, Accumulation of phenylalanine and its catabo...

Accumulation of phenylalanine and its catabolic products leads to central nervous system damage. The extent of damage caused to the brain depends on the time at which the insult oc

Is it necessary for blood to have less or more hemoglobin, Q. In high altit...

Q. In high altitudes is it necessary for the blood to have less or more hemoglobin? In high altitudes the oxygen concentration and air is rarefied is lower than in low altitude

Radiolarians - protozoan, Radiolarians - Protozoan Radiolarians are en...

Radiolarians - Protozoan Radiolarians are entirely marine planktonic species with spherical bodies and radiating pseudopodia known as axopods. The spherical body is divided in

Slight or no metamorphosis, Slight or no Metamorphosis In primitive w...

Slight or no Metamorphosis In primitive wingless insects (Apterygota) such as spring tails, silver fish etc. and in secondarily apterous insects the young ones which hatch fr

Alteration of turgor of guard cells, Alteration of Turgor of Guard Cells ...

Alteration of Turgor of Guard Cells There are two ways in which the relative turgor of guard cells may be altered. A decrease in osmotic potential or A decre

Organisation of nervous system, Organisation of Nervous System Nervou...

Organisation of Nervous System Nervous systems are composed of nerve cells or neurons and glial cells. In the latter half of the 19 th century it was strongly believed that

Transition of the vertebrates, Q Which is the chordate class considered an ...

Q Which is the chordate class considered an evidence of the transition of the vertebrates from the aquatic to the dry land environment? The amphibians are totally aquatic in th

Orders, order of the phylum protozoa

order of the phylum protozoa

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