Angelique P. HibayaII- Amethyst

Urey-Miller Experiment

Redi ExperimentPhotosynthesis

Urey-Miller Experiment

Harold C. Urey

Stanley L. Miller

• tested Alexander Oparin's and J. B. S. Haldane's hypothesis that conditions on the primitive Earth favored chemical reactions that synthesized organic compounds from inorganic precursors

• an experiment that simulated hypothetical conditions thought at the time to be present on the early Earth, and tested for the occurrence of chemical origins of life

• Analysis showed that organic molecules including glycine and alanine (simple amino acids), urea, aldehydes, and carboxylic acids were produced

Urey-Miller Experiment

• conducted in 1952 and published in 1953

Urey-Miller Experiment

The gases used in the experiment are:

Water (H2O)

Methane (CH4)

Ammonia (NH3)

Hydrogen (H2)

Redi Experiment

Francesco Redi

In 1668, Francesco Redi started an experiment with three jars, flies,

maggots, and rotting meat to disprove the theory of

Spontaneous Generation.

Redi Experiment

STEP 1

Redi placed rotting meat in three jars.

The experiment went as follows:

STEP 2

In the first jar, he left the jar open to the air.

Redi Experiment

STEP 3

On the 2nd jar, he placed a cover on the jar. 

The experiment went as follows:

STEP 4

On the 3rd jar, he placed a gauze or netting over the jar.  

Redi Experiment

Results:1. Unsealed – maggots on meat2. Sealed – no maggots on meat3. Gauze – few maggots on gauze, none on meat

Photosynthesis

PHOTO “LIGHT”=SYNTHESIS

=“PUTTING TOGETHER”

Photosynthesis “putting together with light”. is the process of converting light energy to

chemical energy and storing it in the bonds of sugar.

The overall chemical reaction involved in photosynthesis is:

Photosynthetic organisms are called photoautotrophs.

PhotosynthesisChloroplast

Contains thylakoids

Chlorophyll- the green pigment that captures light

for photosynthesis

Where photosynthesis takes place

The thylakoids contain chlorophyll.

Photosynthesis

PhotosynthesisStages of

PhotosynthesisLight Reaction• or Light Dependent Reaction• Produces energy from solar power

(photons) in the form of ATP and NADPH

PhotosynthesisStages of

PhotosynthesisDark Reaction• Calvin Cycle, Light Independent

Reaction, or Carbon (C3) Fixation• Uses energy (ATP and NADPH) from

light reaction to make sugar (glucose).

Photosynthesis

Photosynthesis

What if there will be no

photosynthesis?

Photosynthesis1.There will be no food production.2.The plants can’t filter carbon dioxide,

and humans would keep exhaling it. This would lead to the death of all plants and animals, since plants use photosynthesis to create food for themselves, and humans need oxygen to live.

3.The food cycle would be disturbed as the Food Chain starts with plants as they produce glucose through photosynthesis.

PREPARE

FOR THEQUIZ!

QUIZ #1When does the Urey-Miller experiment

conducted?

A. 1951B. 1952C. 1953

QUIZ #2Which of the following gases in NOT used

in the Urey-Miller experiment?

A. HydrogenB. OxygenC. Methane

QUIZ #3Which of the following conducted the

Redi Experiment?

A B C

QUIZ #4It is the process of converting light energy to chemical energy and storing it in the bonds

of sugar.

A. Protein synthesisB. ChemosynthesisC. Photosynthesis

QUIZ #5Where does photosynthesis takes place?

A B C

answers1. B

2. B

3. B

4. C

5. B

Thank you!

The End

xoxo, liklik