The bases of the two DNA chains are linked in the middle of the molecule by ________ bonds.

Proteins are made up of ________ strung together by ________ bonds.

Organelles called ________ contain enzymes that digest worn-out parts of cells.

A plant’s central vacuole functions in

When molecules move through a cell membrane from an area of greater concentration to an area of lesser concentration by way of a carrier protein, it is called

Which of the following processes requires both a carrier protein and energy?

The type of bond that forms between two atoms when electrons are shared is a(n) ________ bond.

The type of bond that forms between two atoms when electrons are shared is a(n) ________ bond.

Atoms that bear a positive or negative charge are known as

The most inclusive group in taxonomy is a