Practice Test

Question 1

Which macromolecule is the main source of energy for living things?

Revolt · Accepted Answer

B: carbohydrate

Question 2

Which type of macromolecule is made up of subunits that are called amino acids?

Revolt · Accepted Answer

A: protein

Question 3

A scientist is working with methane open paren CH sub 4 close paren and butane open paren cap c sub 4 cap h sub 10 close paren Which statement best compares these chemicals?

Revolt · Accepted Answer

D: They are compounds made of the same two elements, but each contain different numbers of atoms.

Question 4

Which reaction is exothermic?

Revolt · Accepted Answer

B: a reaction that releases energy into the environment

Question 5

There are more hydrogen atoms in living organisms than any other atom, but oxygen is more abundant in terms of mass. Why is this statement true?

Revolt · Accepted Answer

B: Hydrogen atoms have a lower mass than oxygen atoms.

Question 6

Which component is affected when a catalyst is added to a chemical reaction?

Revolt · Accepted Answer

C: the activation energy

Question 7

By which process does water vapor become a cloud?

Revolt · Accepted Answer

B: condensation

Question 8

Which process is performed by both plants and animals to break down sugars to provide energy in the form of ATP?

Revolt · Accepted Answer

A: cellular respiration

Question 9

Which statement describes one way that RNA differs from DNA?

Revolt · Accepted Answer

D: They contain different five-carbon sugars and a different nitrogenous base.

Question 10

What does the dotted line between the water molecules represent?

Revolt · Accepted Answer

C: a hydrogen bond

Practice Test Answers

More from this Course

TRY EDGENUITY HACKS