week 13 metabolism

Question 1

where do cells get energy from

Answer 1

from electrons with a negative redox potential
(HIGH ENERGY ELECTRONS)

Question 2

why do cells need reductive power

Answer 2

for anabolic processes

Question 3

why do cells need a source of carbon

Answer 3

to build cellular components

Question 4

metabolism = ?

Answer 4

catabolism + anabolism

Question 5

what is catabolism

Answer 5

when large complex organic molecules are decomposed into small molecules

Question 6

catabolism points;

Answer 6

degradative
oxidative
energy is liberated
converging

Question 7

what is anabolism

Answer 7

when large complex organic molecules are constructed from small molecules

Question 8

anabolism points;

Answer 8

biosynthetic
reductive
energy is required
diverging

Question 9

glucose oxidation steps;

Answer 9

1. reduces activation energy so that reaction can occur at 37 degrees
2. reduces the free energy released
3. provides convenient control points
4. can be integrated with other cellular metabolism

Question 9

glucose oxidation steps;

Answer 9

1. reduces activation energy so that reaction can occur at 37 degrees
2. reduces the free energy released
3. provides convenient control points
4. can be integrated with other cellular metabolism

Question 10

what is a chemotroph

Answer 10

an organism that obtains energy by the oxidation of electron donors in their environments.

can be organic or inorganic.

Question 11

electron flow in chemotrophs;

Answer 11

organic compounds are oxidised to release high energy electrons

organic cofactors act as electron carriers

a terminal electron acceptor is reduced