UConn Biology 1107 – Gski Midterm Exam
Questions And Correct Answers (Verified Answers)
Plus Rationales 2025 Q&A | Instant Download Pdf
1. Which macromolecule is primarily responsible for catalyzing biochemical
reactions?
A. Carbohydrates
B. Proteins
C. Lipids
D. Nucleic acids
Proteins, especially enzymes, catalyze most biochemical reactions due to
their diverse and complex three-dimensional structures.
2. Which of the following is a correct monomer-polymer pairing?
A. Nucleotide - Polysaccharide
B. Amino acid - Polypeptide
C. Fatty acid - Protein
D. Monosaccharide - DNA
Amino acids are the monomers that build polypeptides and proteins.
3. Which structure is found in both prokaryotes and eukaryotes?
A. Nucleus
B. Mitochondria
C. Ribosomes
D. Golgi apparatus
, Ribosomes are the universal organelles found in both prokaryotic and
eukaryotic cells.
4. The process by which monomers are joined to form polymers is called:
A. Hydrolysis
B. Oxidation
C. Dehydration synthesis
D. Denaturation
Dehydration synthesis removes a water molecule to form a covalent bond
between monomers.
5. Which level of protein structure involves hydrogen bonds between the
backbone atoms of the polypeptide chain?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Secondary structure includes α-helices and β-sheets, stabilized by
hydrogen bonding between backbone atoms.
6. The main function of carbohydrates in cells is:
A. Genetic information storage
B. Enzyme catalysis
C. Energy storage and structure
D. Hormone signaling
Carbohydrates primarily serve as energy sources and structural
components like cellulose or glycogen.
, 7. Which component of the cell membrane helps maintain fluidity at lower
temperatures?
A. Phospholipids
B. Proteins
C. Cholesterol
D. Carbohydrates
Cholesterol stabilizes membrane fluidity, preventing it from becoming too
rigid in cold conditions.
8. The bond formed between two water molecules is a:
A. Covalent bond
B. Hydrogen bond
C. Ionic bond
D. Peptide bond
Hydrogen bonds are weak attractions between the slightly positive
hydrogen of one water molecule and the slightly negative oxygen of
another.
9. Which property of water allows it to move up plant stems via capillary
action?
A. Low surface tension
B. Cohesion and adhesion
C. High specific heat
D. Low density of ice
Cohesion (water to water) and adhesion (water to walls) allow capillary
action in plants.
Questions And Correct Answers (Verified Answers)
Plus Rationales 2025 Q&A | Instant Download Pdf
1. Which macromolecule is primarily responsible for catalyzing biochemical
reactions?
A. Carbohydrates
B. Proteins
C. Lipids
D. Nucleic acids
Proteins, especially enzymes, catalyze most biochemical reactions due to
their diverse and complex three-dimensional structures.
2. Which of the following is a correct monomer-polymer pairing?
A. Nucleotide - Polysaccharide
B. Amino acid - Polypeptide
C. Fatty acid - Protein
D. Monosaccharide - DNA
Amino acids are the monomers that build polypeptides and proteins.
3. Which structure is found in both prokaryotes and eukaryotes?
A. Nucleus
B. Mitochondria
C. Ribosomes
D. Golgi apparatus
, Ribosomes are the universal organelles found in both prokaryotic and
eukaryotic cells.
4. The process by which monomers are joined to form polymers is called:
A. Hydrolysis
B. Oxidation
C. Dehydration synthesis
D. Denaturation
Dehydration synthesis removes a water molecule to form a covalent bond
between monomers.
5. Which level of protein structure involves hydrogen bonds between the
backbone atoms of the polypeptide chain?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Secondary structure includes α-helices and β-sheets, stabilized by
hydrogen bonding between backbone atoms.
6. The main function of carbohydrates in cells is:
A. Genetic information storage
B. Enzyme catalysis
C. Energy storage and structure
D. Hormone signaling
Carbohydrates primarily serve as energy sources and structural
components like cellulose or glycogen.
, 7. Which component of the cell membrane helps maintain fluidity at lower
temperatures?
A. Phospholipids
B. Proteins
C. Cholesterol
D. Carbohydrates
Cholesterol stabilizes membrane fluidity, preventing it from becoming too
rigid in cold conditions.
8. The bond formed between two water molecules is a:
A. Covalent bond
B. Hydrogen bond
C. Ionic bond
D. Peptide bond
Hydrogen bonds are weak attractions between the slightly positive
hydrogen of one water molecule and the slightly negative oxygen of
another.
9. Which property of water allows it to move up plant stems via capillary
action?
A. Low surface tension
B. Cohesion and adhesion
C. High specific heat
D. Low density of ice
Cohesion (water to water) and adhesion (water to walls) allow capillary
action in plants.
