Lecture 9

Question 1

Earth’s early beginnings?

Answer 1

Fragment of rock orbiting solar system, cooling (solid rocks floated on the molten magma), temperature dropped, basins filled with water and formed oceans

Question 2

Raw ingredients for life?

Answer 2

1. Abiotic synthesis for organic molecules
2. Abiotic synthesis of macromolecules
3. Formation of protocells capable of metabolism
4. self replicating molecules

Question 3

Organic molecules?

Answer 3

Amino acids
Nitrogenous bases
Sugars
Lipids

Question 4

Inorganic atmosphere gases?

Answer 4

methane ammonia hydrogen water vapor carbon dioxide nitrogen

Question 5

In step 2, what do AA, Nitrogen, and sugars turn into?

Answer 5

Proteins
Enzymes
Nucleic acids

Question 6

RNA properties?

Answer 6

Single stranded
Fragile
Self replicating

Question 7

DNA properties?

Answer 7

Double helix

Stable

Question 8

Fossil?

Answer 8

Preserved remnants of past organisms

Question 9

Strata?

Answer 9

Distinct rock layers

Question 10

Probability of an organism (or part of) becoming fossilized depends on:

Answer 10

hard- than if soft-bodied aqua than terrestrial

inshore marine than offshore decomposing organisms absent