Campbell+Biology+Concepts+and+Connections+9th+Ed

What are coral reefs and how are they formed?

Coral reefs are diverse ecosystems formed by the gradual buildup of calcium carbonate skeletons of small coral animals.

Why is rising atmospheric CO2 a threat to coral reefs?

Increased CO2 levels dissolved in water react to form an acid, causing ocean acidification which can harm coral reefs.

What is ocean acidification?

Ocean acidification refers to the process by which CO2 dissolving in seawater lowers the pH of the ocean.

What percentage of your body is made up of water?

Your cells are about 70% water.

What is the significance of trace elements in human health?

Trace elements are required in very small quantities but are essential for proper bodily functions, like iodine for thyroid hormone production.

What is the pH scale?

The pH scale measures how acidic or basic a solution is, ranging from 0 (most acidic) to 14 (most basic), with 7 being neutral.

How do strong and weak chemical bonds differ?

Strong chemical bonds, like covalent bonds, link atoms into molecules, while weak bonds, like hydrogen bonds, hold molecules together in a more transient way.

What is a proton?

A proton is a subatomic particle with a single positive electrical charge found in the nucleus of an atom.

What is a covalent bond?

A covalent bond is formed when two atoms share one or more pairs of electrons.

Why is water an effective solvent?

Water's polarity allows it to dissolve many substances, making it an effective solvent for biological processes.

What happens to molecular structure when water freezes?

When water freezes, hydrogen bonds hold the molecules apart in a crystal structure, making ice less dense than liquid water.

How do acids and bases interact in solution?

Acids release hydrogen ions (H+) in solution, while bases can either accept H+ ions or release hydroxide ions (OH-), affecting the pH.

What role does water's high specific heat play in temperature moderation?

Water absorbs a large amount of heat without a significant rise in temperature, helping to stabilize temperatures in organisms and environments.

What is the role of buffers in biological systems?

Buffers help maintain a constant pH in biological fluids by absorbing excess H+ ions when they are in excess and releasing them when depleted.

What are the main elements that compose living organisms?

Oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus make up about 99% of living matter.

What are the emergent properties of compounds?

Emergent properties arise when compounds exhibit characteristics different from the individual elements that make them up.