Cells, molecules and enzymes

The function of a ribosome is

• control which substances enter and leave the cell

• cellular respiration

• photosynthesis

• protein synthesis

What is the cell wall of a yeast cell made of?

• cellulose

• chitin

• peptidoglycan

• glycogen

What chemical elements would you find in starch?

• C,H,O,N

• C,H,O

• C,H,N

• C,H,O,N,S

To test for protein you should use

• Biuret solution

• Benedicts reagent

• Ethanol

• Iodine

A positive test for glucose would give what result?

• Brick orange

• Blue black

• Lilac

• Brick red

The Benedicts test is different from the other food tests because......

• You must freeze the solution

• You have to heat the solution

• You have to take extra safety precaution as it is flammable

• It is irritant if it enters your eyes

A biological catalyst that lowers the activation energy required for an enzyme to proceed

• enzyme

• carbohydrate

• substrate

• lipid

The active site of an enzyme is determined by

• the substrate

• the protein

• the number of different substrates present

• the sequence of amino acids that make up the protein

Three limiting factors of enzyme activity are......

• pH, light intensity and substrate concentration

• pH, temperature and substance concentration

• pH, temperature and substrate concentration

• light intensity, temperature and substrate concentration

The temperature that gives the highest rate of reaction for an enzyme is called the .......

• optimum

• optimus

• optimax

• opthalmology