Hydrogen bonds form between molecules containing ________ bonds; the hydrogen bond is between a hydrogen atom of one molecule and a partially ________ charged atom of another.

Which of the following statements best describes RNA?

The cavity of the body immediately inferior to the diaphragm is the ________ cavity.

When a sperm cell comes into contact with an egg cell, there is a change in the electrical charge across the plasma membrane and various channel proteins close. These channels would be called

In an x-ray film of the skeletal system, the dense tissue areas appear ________ because they ________ the x-rays; and the less dense tissues appear ________ because they ________ the x-rays.

Which of the following chemical reactions best represents the decomposition of ATP?

What type of attachment proteins attach cells to extracellular molecules?

An electrolyte is

The molecule used most frequently by cells as a fuel belongs to which of the following groups?

The fluid-mosaic model of the plasma membrane suggests that