Biology 1113H Exam 1 WITH 100%
CORRECT ANSWERS 2025/2026
Carbon-12 is the most common isotope of carbon and has a mass number of 12. However, the
average atomic mass of carbon found on a periodic table is slightly more than 12 Daltons. Why?
A) Some carbon atoms in nature have more neutrons.
B) Some carbon atoms in nature have an extra proton.
C) The atomic mass does not include the mass of electrons.
D) Some carbon atoms in nature have a different valence electron distribution. - CORRECT
ANSWER ✔✔A) Some carbon atoms in nature have more neutrons.
Water molecules can form hydrogen bonds with _____.
A) compounds that have polar covalent bonds.
B) chloride ions (Cl-)
C) oxygen gas (O2) molecules.
D) oils - CORRECT ANSWER ✔✔A) compounds that have polar covalent bonds.
Stanley Miller's 1953 experiments supported the hypothesis that _____.
A) organic molecules can be synthesized abiotically under conditions that may have existed on
early Earth
B) life on Earth arose from simple organic molecules, with energy from lightning and volcanoes
C) the conditions on early Earth were conducive to the origin of life
D) life on Earth arose from simple inorganic molecules - CORRECT ANSWER ✔✔A) organic
molecules can be synthesized abiotically under conditions that may have existed on early Earth
, The molecular formula for glucose is C6H12O6. What would be the molecular formula for a
molecule made by linking three glucose molecules together by dehydration reactions?
A) C18H32O16
B) C6H10O5
C) C18H36O18
D) C18H30O15 - CORRECT ANSWER ✔✔A) C18H32O16
Which of the following statements is FALSE? Saturated fats _____.
A) are more common in animals than in plants
B) usually solidify at room temperature
C) contain more hydrogen than unsaturated fats that consist of the same number of carbon
atoms
D) have many double bonds in the carbon chains of their fatty acids - CORRECT ANSWER ✔✔D)
have many double bonds in the carbon chains of their fatty acids
You disrupt all hydrogen bonds in a protein. What level of structure will be preserved?
A) tertiary structure
B) primary structure
C) secondary structure
D) quaternary structure - CORRECT ANSWER ✔✔B) primary structure
The R-group, or side chain, of the amino acid serine is -CH2-OH. The R-group, or side chain, of
the amino acid leucine is -CH2-CH-(CH3)2. Where would you expect to find these amino acids in
a globular protein in aqueous solution?
CORRECT ANSWERS 2025/2026
Carbon-12 is the most common isotope of carbon and has a mass number of 12. However, the
average atomic mass of carbon found on a periodic table is slightly more than 12 Daltons. Why?
A) Some carbon atoms in nature have more neutrons.
B) Some carbon atoms in nature have an extra proton.
C) The atomic mass does not include the mass of electrons.
D) Some carbon atoms in nature have a different valence electron distribution. - CORRECT
ANSWER ✔✔A) Some carbon atoms in nature have more neutrons.
Water molecules can form hydrogen bonds with _____.
A) compounds that have polar covalent bonds.
B) chloride ions (Cl-)
C) oxygen gas (O2) molecules.
D) oils - CORRECT ANSWER ✔✔A) compounds that have polar covalent bonds.
Stanley Miller's 1953 experiments supported the hypothesis that _____.
A) organic molecules can be synthesized abiotically under conditions that may have existed on
early Earth
B) life on Earth arose from simple organic molecules, with energy from lightning and volcanoes
C) the conditions on early Earth were conducive to the origin of life
D) life on Earth arose from simple inorganic molecules - CORRECT ANSWER ✔✔A) organic
molecules can be synthesized abiotically under conditions that may have existed on early Earth
, The molecular formula for glucose is C6H12O6. What would be the molecular formula for a
molecule made by linking three glucose molecules together by dehydration reactions?
A) C18H32O16
B) C6H10O5
C) C18H36O18
D) C18H30O15 - CORRECT ANSWER ✔✔A) C18H32O16
Which of the following statements is FALSE? Saturated fats _____.
A) are more common in animals than in plants
B) usually solidify at room temperature
C) contain more hydrogen than unsaturated fats that consist of the same number of carbon
atoms
D) have many double bonds in the carbon chains of their fatty acids - CORRECT ANSWER ✔✔D)
have many double bonds in the carbon chains of their fatty acids
You disrupt all hydrogen bonds in a protein. What level of structure will be preserved?
A) tertiary structure
B) primary structure
C) secondary structure
D) quaternary structure - CORRECT ANSWER ✔✔B) primary structure
The R-group, or side chain, of the amino acid serine is -CH2-OH. The R-group, or side chain, of
the amino acid leucine is -CH2-CH-(CH3)2. Where would you expect to find these amino acids in
a globular protein in aqueous solution?
