DE Biology Midterm Unit 02 Question Set

What four elements make up 96% of living matter?

• Calcium, Phosphorus, Potassium, and Sulfur

• Iron, Copper, Zinc, and Magnesium

• Carbon, Hydrogen, Oxygen, and Nitrogen

• Sodium, Chlorine, Potassium, and Oxygen

Intermolecular attractions, such as hydrogen bonds, occur between molecules due to the attraction between:

• Two hydrophobic regions.

• Two nonpolar molecules.

• The positively-charged atom in one polar covalent molecule and the negatively-charged atom in another polar covalent molecule.

• A cation and an anion.

Which type of reaction absorbs free energy and typically involves building a larger molecule as a product?

• Exergonic reaction

• Hydrolysis

• Catabolic reaction

• Endergonic reaction

Tags

NGSS.HS-LS1-6

Which type of reaction releases free energy and typically involves breaking a larger molecule into a smaller product?

• Exergonic reaction

• Dehydration synthesis

• Anabolic reaction

• Endergonic reaction

The process of removing water to make a polymer from monomers is known as:

• Hydrolysis

• Exergonic reaction

• Dehydration synthesis

• Polymerization

The process of adding water to break a polymer is known as:

• Hydrolysis

• Exergonic reaction

• Dehydration synthesis

• Polymerization

All of the unique properties of water, such as its cohesive behavior and ability to moderate temperature, are due to water's polarity and its ability to:

• Exhibit high heat of vaporization.

• Form ionic bonds.

• Form hydrogen bonds.

• Dissolve nonpolar substances.

Why does ice float in liquid water?

• Liquid water is less dense than ice.

• Liquid water has stronger hydrogen bonds than ice.

• Hydrogen bonds in ice are more structured, making ice less dense.

• Ice is more compact than liquid.

Which term describes a molecule that does not have an affinity for water, like oil molecules that have relatively nonpolar bonds?

• Amphipathic

• Hydrophilic

• Hydrophobic

• Aqueous

Which term describes a molecule that has an affinity for water, like salt that can be dissolved by water?

• Amphipathic

• Hydrophilic

• Hydrophobic

• Aqueous