01
True or false
1 point
True or false: Water is polar because oxygen attracts shared electrons more strongly than hydrogen, creating partial charges in the molecule.
Free Practice Quiz Question List
2 Biological Molecules Online Quiz Questions
Use this free practice quiz with 20 questions to review 2 Biological Molecules, test your knowledge, and prepare for your next test or exam.
20 questions
02
Choose one
1 point
Which carbohydrate do animals and fungi use to store glucose?
- A
Cellulose
- B
Glycogen
- C
Starch
- D
Glucose
03
Written response
1 point
What is the biological term for the simplest unit of a carbohydrate?
04
Fill in the blank
1 point
Steroids, including cholesterol, are characterized by fused carbon rings.
05
True or false
1 point
True or false: Like proteins and nucleic acids, most lipids are polymers built from repeating monomer units.
- A
True
- B
False
06
Choose one
1 point
How can carbon–carbon double bonds in an unsaturated fatty acid affect the packing of fat molecules?
- A
They make the fatty acid dissolve readily in water.
- B
They cause the molecule to form a peptide bond.
- C
They can create a bend that affects how tightly fat molecules pack.
- D
They turn the fatty acid into a repeating carbohydrate polymer.
07
Choose one
1 point
A molecule binds particular reactants and speeds up a chemical reaction. Which protein function does this describe?
- A
They bind particular reactants and accelerate chemical reactions.
- B
They store the base sequence used to copy DNA.
- C
They form the bilayer boundary of every cell membrane.
- D
They carry amino acids to the protein-making machinery.
08
Written response
1 point
What is the term for a change in a protein's shape that can impair its function, such as one caused by temperature or pH?
09
Fill in the blank
1 point
In addition to a sugar and a phosphate group, each nucleotide contains a .
10
Choose all
1 point
Select all statements that correctly describe RNA.
- A
RNA usually consists of one strand.
- B
RNA uses uracil instead of thymine.
- C
Messenger RNA carries a copy of information.
- D
Transfer RNA delivers amino acids.
- E
RNA always forms a double helix with two strands.
11
Choose one
1 point
Which carbohydrate provides structural support as a major component of plant cell walls?
- A
Cellulose
- B
Glycogen
- C
Glucose
- D
Starch
12
Choose all
1 point
When phospholipids form a bilayer in water, select all statements that correctly describe the orientation of their parts.
- A
Their water-attracting heads face the watery environments.
- B
Their water-repelling tails face outward into the watery environments.
- C
Their water-repelling tails are tucked inward.
- D
Their heads and tails both attract water.
13
Open ended
1 point
Explain how attraction among water molecules helps maintain continuous water columns in plants, and name the molecular interaction involved.
14
True or false
1 point
True or false: Because water is polar, nonpolar substances such as oils dissolve readily in it.
- A
True
- B
False
15
Choose one
1 point
A plant carbohydrate consists of glucose units joined in a pattern different from starch. Which function best matches cellulose?
- A
It stores glucose in animal muscle and liver.
- B
It supports plant cell walls and provides dietary fiber for humans.
- C
It forms the water-attracting heads of cell membranes.
- D
It carries amino acids to ribosomes.
16
Written response
1 point
What carbohydrate do animals and fungi use to store glucose units for release when needed?
17
Choose one
1 point
A phospholipid bilayer separates watery fluid inside a cell from watery fluid outside it. How are the phospholipids arranged?
- A
The heads point inward and the tails face the watery environments.
- B
Both heads and tails face the watery environments.
- C
The heads face the watery environments and the tails point inward.
- D
Both heads and tails point inward.
18
Written response
1 point
What is the variable part of an amino acid, whose chemical properties help influence protein folding, called?
19
Choose one
1 point
Why can an enzyme bind particular reactants and accelerate their chemical reaction?
- A
Its binding region suits particular substrates, helping it accelerate specific reactions.
- B
It stores information in a sequence of nitrogen-containing bases.
- C
It forms a bilayer with water-attracting heads and water-repelling tails.
- D
It releases glucose by breaking down cellulose in humans.
20
Choose one
1 point
A DNA strand has the base sequence A-C-T-G. Which sequence is complementary to it?
- A
A-C-T-G
- B
G-A-C-T
- C
T-G-A-C
- D
T-C-G-A