AP Biology Unit 1 Review

Front

Why is water considered polar?

Back

Water is considered polar due to the presence of polar covalent bonds, where oxygen is more electronegative than hydrogen, leading to a partial negative charge on oxygen and a partial positive charge on hydrogen.

Front

What does not result from hydrogen bonding in water molecules?

Back

Dissolving fats does not result from hydrogen bonding in water molecules.

Front

What gives rise to the cohesiveness of water molecules?

Back

The cohesiveness of water molecules arises from hydrogen bonds, which are attractions between the partial positive charge of hydrogen atoms and the partial negative charge of oxygen atoms.

Front

Which macromolecule(s) have phosphorus?

Back

Nucleic Acids are the macromolecules that contain phosphorus.

Front

Which of the 4 major macromolecules provides a quick burst of energy?

Back

Carbohydrates provide a quick burst of energy.

Front

Define hydrogen bonding.

Back

Hydrogen bonding is a weak attraction between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom.

Front

What is cohesion in the context of water?

Back

Cohesion refers to the attraction between water molecules, which allows them to stick together, contributing to surface tension.

Front

What is adhesion in the context of water?

Back

Adhesion is the attraction between water molecules and other substances, which helps water to climb up plant roots and stems.

Front

What role do carbohydrates play in living organisms?

Back

Carbohydrates serve as a primary source of energy and are also important for structural components in cells.

Front

What are the four major macromolecules?

Back

The four major macromolecules are carbohydrates, lipids, proteins, and nucleic acids.