KS3 Bio Food (Enzymes)

Enzymes are protein molecules which act as catalysts, what do catalysts do?

• slow down reactions

• speed up reactions

• make reactions hotter

• make reactions colder

Enzymes have a specific shape. This shape fits into the molecule it will break apart or join together, what is this called?

• substrate

• denatured

• active site

• catalyst

The molecules that enzymes act upon are called...

• substrate

• denatured

• active site

• catalyst

What is the model used for how enzymes only work for specific substrates?

• lock and key

• slippers and pipe

• tea cup and spoon

• tick and tock

If enzymes are heated too much or put into a higher or lower pH, their shape can change, what is this called?

• heatified

• broken

• denature

• decomposition

Enzymes break starch down into...

• amino acids

• fatty acids

• glucose

• blood

Protease enzymes break down...

• proteins

• carbohydrates

• starch

• fats

Lipase enzymes break down...

• proteins

• carbohydrates

• starch

• fats

Where are most digested food molecules absorbed?

• stomach

• large intestine

• mouth

• small intestine

Why can't undigested food molecules be absorbed?

• too small

• too large

• too complex

• too dangerous