Origin of Life and Properties of water

Miller/Urey and other scientists have shown that:

•  Life on early Earth required material from space
• Cells survived in the primitive atmosphere
• Amino acids could be produced from inorganic molecules 
• Simple cells can be produced in a laboratory

The idea that Earth's early oceans had organic molecules that became the first life is called the...

• Primordial soup hypothesis
• Bubble hypothesis
• Miller-Urey Experiment
• Radioactive dating theory

Which of the following was probably not present in the atmosphere of the primitive Earth? 

• methane
• oxygen
• water
• carbon dioxide

Tags

NGSS.HS-ESS1-6

The smallest unit which can be considered life is called __________. 

•  a prokaryote
• a LUCA
• a cell
• a phospholipid

Which statement best describes conditions on early Earth?

• hot with volcanic activity and electrical storms
• dry land covered with volcanic dust
• cold oceans
• dark and dusty with abundant water

Tags

NGSS.HS-ESS1-6

Large bodies of water do not quickly fluctuate in temperature. Why?

• Water is a solvent.
• Water has a high heat capacity.
• Water acts as a buffer.
• Water is non-polar.

Tags

NGSS.HS-ESS2-5

What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• helium and carbon
• oxygen and carbon

Tags

NGSS.MS-PS1-1

The tightness across the surface of water that enables paper clips to float is ____________.

• adhesion
• capillary action
• surface tension
• polarity

Which property of water allows it to form droplets when in liquid form?

• cohesion

• specific heat

• nature as a solvent

• polarity

The fact that ice floats on liquid water is due to the fact that ........

• as water freezes, it expands and its density decreases.
• as water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• as water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• as water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Answer explanation

During freezing there is not enough energy to break the stable hydrogen bonds, therefore they freeze in place making the ice slightly less dense that liquid water.

Tags

NGSS.HS-ESS2-5