B3

Question 1

active site

Answer 1

the site on an enzyme where the reactants bind

Question 2

amino acids

Answer 2

molecules made up of carbon, hydrogen, oxygen, and nitrogen that are the building blocks of proteins

Question 3

amylase

Answer 3

enzyme that speeds up the digestion of starch into sugars

Question 4

bile

Answer 4

neutralises stomach acid to give a high pH for the enzymes from the pancreas and small intestine to work well. It is not an enzyme

Question 5

carbohydrases

Answer 5

enzymes that speed up the breakdown of carbohydrates into simple sugars

Question 6

carbohydrates

Answer 6

molecules that contain only carbon, hydrogen, and oxygen. They provide the energy for the metabolism and are found in foods such as rice, potatoes, and bread

Question 7

catalyst

Answer 7

a substance that speeds up the rate of another reaction but is not used up or changed itself

Question 8

denatured

Answer 8

the breakdown of the molecular structure of a protein so it no longer functions

Question 9

differentiate

Answer 9

the process where cells become specialised for a particular function

Question 10

digestive system

Answer 10

organ system where food is digested and absorbed

Question 11

enzymes

Answer 11

biological catalysts, usually proteins

Question 12

fatty acids

Answer 12

part of the structure of a lipid molecule

Question 13

lipase

Answer 13

enzymes that speed up the breakdown of lipids into fatty acids and glycerol

Question 14

lipids

Answer 14

include fats and oils and are found in foods such as butter, olive oil, and crisps. They are made of carbon, hydrogen and oxygen

Question 15

metabolism

Answer 15

the sum of all the reactions taking place in a cell or the body of an organism

Question 16

organ

Answer 16

an aggregation (collection ) of different tissues working together to carry out specific functions

Question 17

organ system

Answer 17

a group of organs that work together to carry out specific functions and form organisms