A2.1 Origin Of Cells Flashcards
How old is planet earth and how did it form?
4.5 Billion years old. A bunch of swirling particles collided and formed larger masses.
What did the Early gas compounds consist of?
Methane, ammonia, carbonn dioxide, hydrogen sulphide, they allowed for ultraviolet light to penetrate and retain heat
What was the atmosphere like on early earth?
After the number of impacts on earth decreased the atmosphere was thick and volcanic eruptions released water vapour and other compounds.
Was free oxygen present on early earth?
No, had it been it would have formed a layer of ozone blocking the ultraviolet light and prevent the development of higher temperatures.
What is CH4?
Methane
What is NH3?
Ammonia
What is H2O?
Water vapour
What is carbon dioxide?
CO2
Hydrogen Sulphide is?
H2S
What is H2
Hydrogen
What are the 7 main functions of life?
Metabolism, Growth, reproduction, Response, Homeostasis, Nutrition, Exertion
What is N2
Nitrogen
Explain Metabolism.
The chemical reactions that occur within an organism to convert one form of energy to another.
What is response and why is it important?
Response to stimuli in the environment Is essential for the organism to adapt to its environment
What is reproduction?
Hereditary molcules that can passed off to offspring.
What is Homeostasis? Provide examples.
The maintenance of a constant internal environment. an organism can control fluctuating temperatures and the acidity levels to create a constant internal environment
What is nutrition?
Using a source of componds with many chemical bonds that can be broken down to provide an organism with the energy needed to maintain life.
What is excretion?
Enables chemical compounds the organism cannot use or that is toxic to be released from the organisms system.
Who first discovered cells?
Robert Hooke in 1665 after looking a cork through a microscope
What does cell theory consist of?
- All organisms are consisted of one or more cells
- Cells are the smallest unit life
- All cells come from pre-existing cells
