Intro to metabolism

Question 1

dedescribe some of the main pathways in anabolic metabolism

Answer 1

• involves synthesizing large molecules from small ones
• reductive in nature
• endergonic

Question 2

describe some of the main pathways in catabolic metabolism

Answer 2

• involved in the breakdown of large molecules to small ones
• oxidative in nature
• exergonic

Question 3

if the concentration at equilibrium is greater than 1, what is the value of standard free energy change? does this mean the reaction is ender/exergonic

Answer 3

if Keq >1, there is more products present meaning that the standard energy is - and the reaction is exergonic

Question 4

if the concentration equilibrium is less than 1, what is the value of standard free energy change? does this mean the reaction is ender/exergonic?

Answer 4

if Keq<1, there is more reactants meaning that the standard energy is + and the reaction is endergonic

Question 5

what determines the directionality to overcome an unfavourable standard G

Answer 5

the concentrations of the substrates and products

Question 6

Fill in the blank.

a(n) ____ can couple a favourable and unfavourable reaction to produce an overall favourable reaction

Answer 6

enzyme. this is done by the enzyme creating a whole new reaction by coupling reactions

Question 7

why is there more energy released when you transfer ADP to AMP than ATP to ADP

Answer 7

because there is more energy released due to stabilization of the ADP molecule

Question 8

describe the reaction that takes place in our body when we exercise and our muscles contract and release lots of energy

Answer 8

phosphocreatine and ADP is converted into active form creatine and ATP through a phosphorylation by creatine kinase during exercise that removes the phosphate group from phosphocreatine and transfers it to ADP converting it into ATP

Question 9

Fill in the blank.

_____ is the driving force behind spontaneity of metabolic reactions

Answer 9

thermodynamics