Why is water described as a polar molecule?

Its oxygen end is slightly negative and its hydrogen ends slightly positive

Why can a single change in a protein's amino-acid sequence change how the protein works?

The sequence sets the folded shape, which sets the function

To carry out cellular respiration and release energy as ATP

A prokaryote has no nucleus or membrane-bound organelles

Water leaves and the cell shrinks

Lowers it so the reaction goes faster

The high temperature denatures the enzyme, changing the active-site shape

The cells express (switch on) different genes

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

What is the subunit (building block) of a protein?
Why is water described as a polar molecule?
How many covalent bonds can a single carbon atom form?
Why can a single change in a protein's amino-acid sequence change how the protein works?
Which structure is found in a plant cell but not in a typical animal cell?
What is the main function of mitochondria?
Which feature best distinguishes a prokaryotic cell from a eukaryotic cell?
Which process moves a substance against its concentration gradient using energy?
A red blood cell is placed in a hypertonic solution (more concentrated outside). What happens?
What does an enzyme do to the activation energy of a reaction?
Why does an enzyme stop working at a very high temperature?
Two cells in the same body have identical DNA but are different cell types. How is this possible?