Biology Unit 1: Quiz 2 Retake

HS-PS1-2 A water (H₂O) molecule is made up of ___ atoms.

• 4

• 3

• 2

• 1

Answer explanation

An atom is the smallest unit of matter that retains all of the characteristics of an element.

HS-ESS2-5 The cohesion of water is described as........

• the amount of energy to convert 1g or a substance from a liquid to a gas.

• resisting temperature change, both for heating and cooling.

• an attraction between particles of the same substance.

• an attraction between two different substances.

Which of the following is an example of a molecule?

• LiF

• NaCl

• CH₄

• Al₂O₃

HS-ESS2-5 In a lab, David sees a coin floating on water. All of the following properties are responsible for this except?

• pH

• cohesion

• polarity

• surface tension

Answer explanation

pH is a measure of how acidic or basic a solution is.

HS-ESS2-5 Which of the following explains why Coke is an acid while lye is a base?

• Coke has a pH of 3 while Lye has a pH of 14

• Coke is sweet and lye is salty

• Coke has a pH of 14 while Lye has a pH of 3

• Coke is liquid but lye is solid

Answer explanation

Acids are below 7 on the pH scale while bases have a pH greater than 7.

HS-ESS2-5 A student mixes strawberry koolaid and water. A pH meter detects a pH of 5.4. What must be true about the solution?

• There are no ions in the solution

• There are more hydrogen ions H⁺

• There are more hydroxide ions OH-

• There is the same amount of H⁺ and OH^-

HS-LS1-6 What makes a molecule polar?

• Even balance of protons and neutrons

• Uneven balance of protons and neutrons

• Equal sharing of electrons

• Unequal sharing of electrons

HS-LS1-6 Which of the following is a monomer for lipids?

• fatty acids

• nucleotides

• amino acids

• monosaccharides

Answer explanation

A monomer is a building block for a macromolecule.

HS-LS1-6 Which of the following macromolecules is responsible for information storage?

• Lipids

• Proteins

• Nucleic Acids

• Carbohydrates

Answer explanation

Nucleic acids store genetic information.

HS-LS1-6 Which of the following characteristics allows carbon to form many different complex molecular structures?

• Has high electronegativity

• Can form four bonds

• Has many isotopes

• Is polar

Answer explanation

Carbon can form long chains, ringed structures, double, single, and triple bonds.