Unit 1 AP Biology Review

Front

What is capillary action?

Back

Capillary action is the ability of water to flow in narrow spaces without the assistance of external forces, due to cohesive forces between water molecules and adhesive forces between water molecules and other materials.

Front

How many hydrogen bonds exist between adenine (A) and thymine (T)?

Back

There are 2 hydrogen bonds between adenine (A) and thymine (T) in DNA.

Front

What are the properties of water that explain transpiration in plants?

Back

The properties of water that explain transpiration in plants are cohesion (water molecules sticking to each other), adhesion (water molecules sticking to other surfaces), and transpiration (the process of water movement through a plant).

Front

What components characterize RNA?

Back

RNA is characterized by a phosphate group, ribose sugar, and uracil as its nitrogenous base.

Front

What causes the meniscus of water in a capillary tube?

Back

The meniscus of water in a capillary tube is caused by the adhesive property of water being stronger than its cohesive property.

Front

Define cohesion in the context of water molecules.

Back

Cohesion is the attraction between water molecules due to hydrogen bonding, which allows water to form droplets and creates surface tension.

Front

Define adhesion in the context of water and other materials.

Back

Adhesion is the attraction between water molecules and other substances, which allows water to climb up surfaces, such as in capillary action.

Front

What is transpiration in plants?

Back

Transpiration is the process by which water evaporates from the leaves of plants, creating a negative pressure that pulls water upward from the roots.

Front

What is the role of hydrogen bonds in water's unique properties?

Back

Hydrogen bonds are responsible for water's high surface tension, high specific heat, and its ability to dissolve many substances.

Front

What is the difference between DNA and RNA in terms of sugar?

Back

DNA contains deoxyribose sugar, while RNA contains ribose sugar.