WorksheetsInt Sci Ext U1T3
Total questions: 10
Worksheet time: 5mins
What is the main function of enzymes in biological reactions?
Increase activation energy
Speed up chemical reactions
Change the pH of the cell
Provide energy for reactions
Enzymes are a type of:
Carbohydrate
Lipid
Protein
Nucleic acid
The specific substance an enzyme acts on is called the:
Product
Substrate
Catalyst
Inhibitor
Which factor does NOT affect enzyme activity?
Temperature
pH
Enzyme color
Substrate concentration
What happens to an enzyme when it becomes denatured?
It becomes more active
It loses its shape and function
It increases substrate binding
It multiplies rapidly
Water's ability to stick to other water molecules is called:
Cohesion
Adhesion
Surface tension
Polarity
Water molecules are polar because:
They have equal sharing of electrons
Oxygen attracts electrons more than hydrogen
Hydrogen is much larger than oxygen
Water carries no electrical charges
What characteristic of water contributes to its ability to absorb and store heat effectively?
Low thermal conductivity
High heat capacity
Neutral pH
Polar structure
The attraction between water molecules and a different surface, like glass, is called:
Cohesion
Adhesion
Density
Capillary force
Ice floats on liquid water because:
Ice is denser than water
Water expands when it freezes
Ice is a gas
Water molecules lose polarity when frozen
