-1stLivingThingsLEC22 Flashcards
What does it means for something to be organic?
It has carbon.
Explain something that Polymerize.
When do small organic molecules do this?
Ex. Plastic
They combine into chains.
When they are concentrated on hot rocks.
What are Protobionts?
They form spontaneously from what?
Clusters of molecules surrounded by a membrane-like structure.
Organic compounds.
What is an example of Protobionts?
Liposomes
What are liposomes? how are they form?
-Membrane-bound droplets.
-when organic lipids are added to water.
・Happens in our salad dressing.
True or False? Liposomes has simple reproduction, they “give birth” to smaller liposomes.
TRUE
Explain the simple “metabolic” reactions that some liposomes carry out.
They break down molecules and gain energy.
What are the 4 steps for creating life?
1) The formation of organic molecules.
2) These joining into polymers.
3) Then collecting into protobionts, with membranes.
4) The origin of self-replicating molecules that made inheritance possible.
What was probably the first genetic material?
RNA
What can RNA do with sections of themselves?
Copy them
RNA sequences can what?
What sequences multipy?
Evolve
Ones that are more stable than others.
Protobionts with self-replicating RNA would have what?
Been better at using resources & multiplied through natural selection.
Once RNA sequences carrying genetic information appeared, what further changes were possible?
The origin of the double-helix DNA.
It is more stable & can be replicated more accurately.
What are index fossils, and what do they allow us to do?
Similar fossils found in the same strata.
Allow us to date strata at different location.
How does radiometric dating work?
When an organism dies, it’s carbon-14 slowly decays (loses neutrons) until it become nitrogen-14. By measuring the nitrogen-14, a fossil’s age can be determine.
