Why is water able to dissolve salt and sugar but not oil?

Water is polar, so it dissolves polar and charged substances but not nonpolar ones like oil

How does an enzyme speed up a chemical reaction?

By lowering the activation energy

The heat denatures it, changing the shape of the active site

They are essentially reverse processes; the products of one are the reactants of the other

Lactic acid fermentation (anaerobic respiration)

By dehydration synthesis (removing water)

12questions. Pick an answer and you'll see why right away.

Why is water able to dissolve salt and sugar but not oil?
Which property of water explains why coastal areas have milder temperatures than inland areas?
What is the monomer (building block) of a protein?
Which macromolecule stores genetic information?
How does an enzyme speed up a chemical reaction?
Why does an enzyme stop working at very high temperatures?
What are the reactants of photosynthesis?
In which organelle does photosynthesis take place?
What is the main product that carries usable energy from cellular respiration?
How are photosynthesis and cellular respiration related?
A sprinter's muscles produce lactic acid when oxygen runs short. What process is occurring?
How do cells build a large polymer from monomers?