intro to metabolism

Question 1

what is metabolism

Answer 1

Metabolism is the sum total of all the enzyme catalysed reactions that occur in a cell

Question 2

Where does the energy for biosynthetic reactions come from

Answer 2

1.atp
2.One of the other triphosphates
3.a reduced coenzyme

Question 3

In mammalian cells there are 5 metabolic pathways that provide energy. what are they

Answer 3

1.Glycolysis, breaks down glucose to the 3 carbon compounds lactate or pyruvate.
2.TCA cycle which converts acetyl-coa into co2
3.pentose phosphate pathway which converts g6p into pentose phosphate and reduces nadp coenzyme.
4.Oxidation of fatty acids which converts them into acetyl-coa and reduces coenzymes.
5.Oxidative phosphorylation in which oxygen is used to oxidise coenzymes which are reduced in the 4 other pathways,with the production of water and atp.

Question 4

In addition to supplying the cells with energy, metabolism provides precusors for synthesis of what

Answer 4

1.carbs
2.lipids
3.nucleic acids
4.proteins

Question 5

Why after training for 5k does the person feel great, hot but cooling down, not out of breath

Answer 5

Fat becomes a more important fuel, carbs become less important, less lactate production

Question 6

Why after training for 5k does the person have greater oxygen transport, muscle has more mitochondria, more enzymes

Answer 6

Because synthesis of specific proteins is accelerated