Unit 1 AP Biology Review

Front

What type of bond is found within water molecules?

Back

Covalent

Answer explanation

The correct answer is covalent bonds, which are formed when atoms share electrons. In water (H2O), each hydrogen atom shares electrons with the oxygen atom, creating strong covalent bonds within the molecule.

Tags

Topic 1

Front

Water property responsible for the movement of water up the stem of a plant

Back

Adhesion and cohesion

Answer explanation

Adhesion and cohesion are key properties of water that enable it to move up the stem of a plant. Cohesion allows water molecules to stick together, while adhesion helps them cling to the plant's xylem walls, facilitating upward movement.

Tags

Topic 1

Front

Water process responsible for evaporative cooling

Back

Specific heat

Answer explanation

Specific heat refers to the amount of energy required to change the temperature of a substance. Water's high specific heat allows it to absorb heat during evaporation, leading to effective evaporative cooling.

Tags

Topic 1

Front

Water property responsible for lake life surviving winter

Back

Less dense as a solid

Answer explanation

The correct answer is 'Less dense as a solid' because ice floats on water, insulating the lake below and allowing aquatic life to survive winter. This unique property of water prevents lakes from freezing solid.

Tags

Topic 1

Front

What type of bond is found between water molecules?

Back

Hydrogen

Answer explanation

The correct answer is Hydrogen. Water molecules are held together by hydrogen bonds, which are weak attractions between the positively charged hydrogen atoms of one water molecule and the negatively charged oxygen atoms of another.

Tags

Topic 1

Front

What property of water allows rocks to skip on a pond?

Back

Cohesion

Answer explanation

Cohesion is the property of water that allows molecules to stick together. This creates a surface tension on the pond, enabling rocks to skip across the water instead of sinking.

Tags

Topic 1

Front

What property of water is used by organisms during sweating?

Back

Evaporative cooling

Answer explanation

The property of water used during sweating is evaporative cooling. When sweat evaporates from the skin, it absorbs heat, cooling the body effectively. This process relies on water's high heat of vaporization.

Tags

Topic 1

Front

Where are hydrogen bonds found in nucleic acids?

Back

Between nitrogenous bases

Answer explanation

Hydrogen bonds in nucleic acids occur between nitrogenous bases, stabilizing the double helix structure of DNA and the secondary structures of RNA. This interaction is crucial for base pairing, ensuring proper genetic information transfer.

Tags

Topic 6

Front

A macromolecule is found to contain the elements C, H, O, N, and S. Identify it.

Back

Protein

Answer explanation

The presence of carbon (C), hydrogen (H), oxygen (O), nitrogen (N), and sulfur (S) indicates a protein. Proteins are macromolecules made up of amino acids, which contain these elements, unlike carbohydrates, lipids, or nucleic acids.

Tags

Topic 7

Front

A macromolecule is found to contain the elements C, H, O, N, and P. Identify it.

Back

Nucleic acid

Answer explanation

Nucleic acids, such as DNA and RNA, are macromolecules composed of carbon (C), hydrogen (H), oxygen (O), nitrogen (N), and phosphorus (P). The presence of phosphorus distinguishes them from carbohydrates, lipids, and proteins.

Tags

Topic 6