metabolism

Question 1

metabolism

Answer 1

the sum of all the chemical reactions that happen in an organism

Question 2

lots of reaction are linked together to form bigger reactions-represent this as a diagram

Answer 2

check answer in textbook pg 111

Question 3

give two examples of where larger molecules are broken down into smaller ones

Answer 3

1. Glucose is broken down in respiration.
2. Excess protein is broken down in a reaction to produce urea, which is then excreted in urine.

Question 4

give three examples of where larger molecules are made from smaller molecules

Answer 4

1. Glucose molecules join together in reactions to form starch, glycogen and cellulose.
2. Lipid molecules are made from one molecules of glycerol and three fatty acids.
3. Glucose is combined with nitrate ions to make amino acids, which are then made into proteins.

Question 5

how do cells use the energy transferred by respiration?

Answer 5

to continuously carry out enzyme-controlled processes which lead to the synthesis of new molecules