Biochemical origin of life - modern concept, PL-SQL Programming

Assignment Help:

BIOCHEMICAL ORIGIN OF LIFE -

  • It is generally agreed by astronomers, geologists and biologists that the earth is approximately 4500-5000 million years old.
  • It is an opinion of a large section of biologists that the original state of the earth bore little resemblance to its present day and had the following probable appearance:
  • It was hot about 4000-8000°C and as it cooled, carbon and the less volatile metals condensed and formed the core of the earth.
  • The surface was probably barren and rugged as volcanic activity, continuous earth movements and contraction on cooling, folded and fractured the surface.

1924_biochemical origin of life.png

  • The atmosphere is believed to have been totally different in those days.
  • The lighter gasses hydrogen (H), helium (He), nitrogen (N), oxygen (O) and argon (Ar) would have escaped because the gravitational field of the partially condensed planet would not contain them..
  • But simple compounds containing these elements would have been retained e.g., water (H2O), ammonia (NH3), carbon dioxide (CO2), methane (CH4), and until the earth cooled below 100°C all water would have existed as vapour. 
  • First molecular compound formed were H2O & NH3.
  • First organic compound formed was CH .
  • Free oxygen was absent. Therefore primitive atmosphere was reducing.
  • The chemical theory of life was elaborated by two workers independently.
  • A. I. Oparin (1923) and J.B.S. Haldane (1929) and was summarized by oparin in his book "The origin of life".
  • They held that Spontaneous generation of life under the present environment conditions is not possible.
  • Earth's surface and atmosphere during the first billion years of its existence were radically different form today's conditions.
  • Earth's initial atmosphere was a reducing one.
  • The first life arose from a collection of chemical through a progressive series of chemical reactions in which atoms combined into inorganic molecules, inorganic molecules into simple organic compounds, and simple organic compounds into complex organic compounds, which finally got organized into the living matter.
  • The sequence of changes an 8 step process, begins right from the formation of earth.

 

2346_biochemical origin of life1.png

  • Solar radiation, heat radiated by earth and lightning provided energy for evolution of molecules.
  • The Oparin-Haldane theory was experimentally supported by Stanley Miller in 1952.

Related Discussions:- Biochemical origin of life - modern concept

Implement a new discount for return shoppers, Brewbean's is implementing a ...

Brewbean's is implementing a new discount for return shoppers - every fifth completed order receives a 10% discount. The count of orders for a shopper is placed in a packaged varia

Variable declaration - sql, Variable Declaration - SQL SQL's support f...

Variable Declaration - SQL SQL's support for variables is very similar to Tutorial D's, except that the syntax for creating persistent  variables-base tables-is quite differen

Object types - syntax, Object Types An object type is a user-defined co...

Object Types An object type is a user-defined complex datatype which encapsulates the data structure along with the functions and procedures required to manipulate the data. Th

Assigning and comparing collections, Assigning and Comparing Collections ...

Assigning and Comparing Collections One collection can be assigned to other by an SELECT, INSERT, UPDATE, or FETCH statement, an assignment statement, or by a subprogram call. A

Using host arrays - bulk bind performance improvement, Using Host Arrays ...

Using Host Arrays The Client-side programs can use anonymous PL/SQL blocks to bulk-bind input and output host arrays. However, this is the well-organized way to pass the colle

Processing transactions, Processing Transactions This part describes ho...

Processing Transactions This part describes how to do the transaction processing. You learn the fundamental techniques that safeguard the consistency of your database, involvin

Keyword and parameter description - cursors, Keyword and Parameter Descript...

Keyword and Parameter Description select_statement: This is a query which returns a result set of the rows. Its syntax is such that of select_ into_statement without the IN

How to use the explain plan for statement, Using the student and faculty ta...

Using the student and faculty tables create a select query that outputs all students for a specific advisor. Generate the execution plan, select out the explain plan . Create an

Overview of control structures-comparison operators, Overview of control st...

Overview of control structures According to the structure theorem, any computer program can be written by using the basic control structures as shown in figure below. They can b

Delete statement - syntax, DELETE Statement The DELETE statement elimin...

DELETE Statement The DELETE statement eliminates whole rows of data from the specified table or view. Syntax:

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