CMB1004/L18 Life in Water

Question 1

Why does water have an unusually high boiling point?

Answer 1

Hydrogen bonding between molecules

Question 2

What determines solubility in water?

Answer 2

Polarity of molecules

Question 3

What is a major driver of protein folding?

Answer 3

Hydrophobicity

Question 4

What is an amphipathic molecule?

Answer 4

A substance with a polar and non-polar end

Question 5

What do phospholipids spontaneously assemble into?

Answer 5

Membranes

Question 6

What is Avogadros number?

Answer 6

6.022x10^23 molecules

Question 7

What concentration is 1M equivalent to?

Answer 7

1 mol/litre

Question 8

What is Brownian motion?

Answer 8

Random movement of molecules due to many collisions with all other molecules in solution

Question 9

Why do smaller molecules move faster than larger molecules?

Answer 9

They collide less often and movement is not hindered as much

Question 10

Define diffusion.

Answer 10

Net flux of molecules down a concentration gradient due to random thermal motion

Question 11

What is the flux equation?

Answer 11

J = P ([C]1-[C]2)

Question 12

What is the equation for diffusion?

Answer 12

t = R^2/6D
Time scale = transverse distance squared/6x diffusion coefficient

Question 13

What is turgor pressure?

Answer 13

Diffusion in the presence of barriers