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

Sql scripts, The SQL ‘CREATE TABLE' scripts for all the tables you have imp...

The SQL ‘CREATE TABLE' scripts for all the tables you have implemented. Note that your tables must correspond exactly to the ERD you have provided in 1. above, or you will lose ma

Pl/sql conditional control: if statements, Pl/sql Conditional Control: IF s...

Pl/sql Conditional Control: IF statements Frequently, it is necessary to take the alternative actions depending on the circumstances. The IF statement execute a series of statem

Sql functions, SQL Functions The PL/SQL uses all the SQL functions invo...

SQL Functions The PL/SQL uses all the SQL functions involving the following aggregate functions that summarize the whole columns of the Oracle data: GROUPING, AVG, COUNT, STDDE

Use serially reusable packages - performance of application, Use Serially R...

Use Serially Reusable Packages To help you to manage the use of memory, the PL/SQL gives the pragma SERIALLY_ REUSABLE that mark some packages as serially reusable . So mark

Exception handling, set serveroutput on declare a number(5); b n...

set serveroutput on declare a number(5); b number(5); c number(5); begin a:=&a; b:=&b; c:=a/b; dbms_output.put_line(c); exception when zero_d

Use of table comparisons - sql, Use of Table Comparisons - SQL Table ...

Use of Table Comparisons - SQL Table comparisons where it is noted that although table expressions cannot be compared, we have TABLE (t) to convert a table expression t into

Indeterminacy in sql, Indeterminacy in SQL Some SQL expressions are ac...

Indeterminacy in SQL Some SQL expressions are actually not function invocations at all in the mathematical sense, being indeterminate-invocations operating on identical input

Committing and rolling back - autonomous transaction, Committing and Rollin...

Committing and Rolling Back The COMMIT and ROLLBACK end the active autonomous transaction but do not exit the autonomous routine. As the figure shows, if one transaction ends,

Parameter modes, Parameter Modes   To define the behavior of formal pa...

Parameter Modes   To define the behavior of formal parameters you use the parameter modes. The 3 parameter modes, IN, OUT, & IN OUT, can be used with any subprogram. Though, a

Cursor attributes in pl sql, Cursor Attributes   The Cursors and curso...

Cursor Attributes   The Cursors and cursor variables have 4 attributes which give you helpful information about the execution of a data manipulation statement. 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