BIO 152 EXAM 1 WITH CORRECT
ANSWERS 2025
Which feature is required for a molecule to be considered
biological? correct answers >> - it must have a carbon
backbone
- it must contain carbon, hydrogen, and oxygen
Composition of cells correct answers >> - Nucleus (DNA -
genetic information)
- Membrane (compartmentalization)
-Protein and RNA
- Abilities to reproduce
- Cytoplasm (cytosol)
- Carbon
- Water
Why is carbon highly verstile? correct answers >> Carbon
can form four bonds because of a unpaired electron on each side
of it.
Which of the following correctly identifies the four major classes
of biological molecules? correct answers >> Proteins,
carbohydrates, nucleic acids, and lipids
Monomer of a carbohydrate correct answers >> glucose
(monosaccharide)
,macromolecules of carbohydrates correct answers >>
disaccharide (sucrose)
polysaccharide (amylose starch)
Functions of Carbohydrates correct answers >> 1) Stored
Energy: such as starch in plants and glycogen in animals
2) High Energy Molecules: such as glucose to drive production of
ATP
3) Structural support: Such as chitin, the major structural
molecule in the shell of a beetle
What are lipids often referred to as? correct answers >> fats
and oils
Overall structure of lipids correct answers >> - varies but
often neutral or mostly neutral molecules dominated by
hydrocarbons
- hydrocarbon tails (fatty acids) can be saturated with hydrogens
or unsaturated
Saturated fatty acids correct answers >> consists of
triglycerides whose carbon carbon chains consist of carbon-
carbon SINGLE bonds
, form straight chains - easier to pack together tight - more likely to
be a solid at room temp
maximum # bonds between C-H
Unsaturated fatty acids correct answers >> consists of
triglycerides whose carbon chains contain one or more carbon-
carbon DOUBLE bonds
form kinked chains - difficult to pack in tight - more likely to be a
liquid at room temp
less than maximum # bonds between C-H
Triglycerides correct answers >> storage form of energy for
lipids
3 tails
Phospholipids correct answers >> main molecule used to
build cell membranes
Structure of Cholesterol and other steroids correct answers >>
four distinct C-H rings with an unique side chain. Overall neutral
and hydrophobic, but can have regions that are amphipathic like
the phospholipids.
ANSWERS 2025
Which feature is required for a molecule to be considered
biological? correct answers >> - it must have a carbon
backbone
- it must contain carbon, hydrogen, and oxygen
Composition of cells correct answers >> - Nucleus (DNA -
genetic information)
- Membrane (compartmentalization)
-Protein and RNA
- Abilities to reproduce
- Cytoplasm (cytosol)
- Carbon
- Water
Why is carbon highly verstile? correct answers >> Carbon
can form four bonds because of a unpaired electron on each side
of it.
Which of the following correctly identifies the four major classes
of biological molecules? correct answers >> Proteins,
carbohydrates, nucleic acids, and lipids
Monomer of a carbohydrate correct answers >> glucose
(monosaccharide)
,macromolecules of carbohydrates correct answers >>
disaccharide (sucrose)
polysaccharide (amylose starch)
Functions of Carbohydrates correct answers >> 1) Stored
Energy: such as starch in plants and glycogen in animals
2) High Energy Molecules: such as glucose to drive production of
ATP
3) Structural support: Such as chitin, the major structural
molecule in the shell of a beetle
What are lipids often referred to as? correct answers >> fats
and oils
Overall structure of lipids correct answers >> - varies but
often neutral or mostly neutral molecules dominated by
hydrocarbons
- hydrocarbon tails (fatty acids) can be saturated with hydrogens
or unsaturated
Saturated fatty acids correct answers >> consists of
triglycerides whose carbon carbon chains consist of carbon-
carbon SINGLE bonds
, form straight chains - easier to pack together tight - more likely to
be a solid at room temp
maximum # bonds between C-H
Unsaturated fatty acids correct answers >> consists of
triglycerides whose carbon chains contain one or more carbon-
carbon DOUBLE bonds
form kinked chains - difficult to pack in tight - more likely to be a
liquid at room temp
less than maximum # bonds between C-H
Triglycerides correct answers >> storage form of energy for
lipids
3 tails
Phospholipids correct answers >> main molecule used to
build cell membranes
Structure of Cholesterol and other steroids correct answers >>
four distinct C-H rings with an unique side chain. Overall neutral
and hydrophobic, but can have regions that are amphipathic like
the phospholipids.
