Origin of life
Upcoming SlideShare
Loading in...5
×

Like this? Share it with your network

Share

Origin of life

  • 358 views
Uploaded on

 

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
358
On Slideshare
268
From Embeds
90
Number of Embeds
1

Actions

Shares
Downloads
0
Comments
0
Likes
0

Embeds 90

http://juliestewart.wikispaces.com 90

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Notes: Origin of Life (pg 2)
  • 2. Notes: Origin of Life (pg 2)• People used to believe that life arose through Spontaneous Generation (life emerging from non-living matter)
  • 3. Notes: Origin of Life (pg 2)• People used to believe that life arose through Spontaneous Generation (life emerging from non-living matter)• Example: Belief that rotting meat turned into maggots
  • 4. Notes: Origin of Life (pg 2)• People used to believe that life arose through Spontaneous Generation (life emerging from non-living matter)• Example: Belief that rotting meat turned into maggots• Spontaneous generation was disproved by Francesco Redi (1668) and Louis Pasteur (1850s)
  • 5. Current theory on the origin of life• Miller and Urey experiment (1953): made a simulation of Earth’s early atmosphere (methane, ammonia, hydrogen), added water and electric shocks (to simulate lightning). After several weeks, amino acids had formed.
  • 6. Current theory on the origin of life• Miller and Urey experiment (1953): made a simulation of Earth’s early atmosphere (methane, ammonia, hydrogen), added water and electric shocks (to simulate lightning). After several weeks, amino acids had formed.• More recent experiments have produced bases found in DNA
  • 7. Current theory on the origin of life• Miller and Urey experiment (1953): made a simulation of Earth’s early atmosphere (methane, ammonia, hydrogen), added water and electric shocks (to simulate lightning). After several weeks, amino acids had formed.• More recent experiments have produced bases found in DNA• Under certain conditions, large organic molecules form microspheres, which have selectively permeable membranes. Over millions of years, these microspheres may have evolved into cells.