really important stuff

Question 1

Which amino acids have negatively charged side chains?

Answer 1

Aspartic acid (asp) and glutamic adic (glu)

Question 2

Which amino acids have positively charged side chains?

Answer 2

Arg, Lys and His
(Arginine, lysine and histidine)

Question 3

Which amino acids have uncharged polar side chains?

Answer 3

Glutamine, serine, threonine, tyrosine and aspargine

Question 4

What is the definition of kcat?

Answer 4

Kcat defines how fast ES complex proceeds to E + P.
It also defines the number of catalytic cycles that each active site undergoes per unit time.

Question 5

between which values does an enzyme reach catalytic perfection?

Answer 5

between 10 *8 and 10 * 9 M/s

Question 6

What happens to the Km and Vmax in competitive inhibition? And non-competitive inhibition?

Answer 6

• In competitive inhibition, the km increases, while vmax stays unaffected.
• In noncompetitive inhibition, km is unaffected, while vmax is lowered.

Question 7

What does photosystem II do? And photosystem I?

Answer 7

Photosystem II uses light energy to extract electrons from water. These electrons are used for pumping protons.
In photosystem I, sunlight generates high-energy electrons that combine with NADP+ to produce NADPH. (Which enters the carbon-fixation cycle along with CO2)

Question 8

Where are phosphatidylehanolamine, phosphatidylserine and phosphatidylcholine produced?

Answer 8

• Phosphaditylethanolamine: mitochondrion
• Phosphatidylserine and phosphatidylcholine: ER