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BSCI 207 Unit 1 Exam Questions and
Answers 100% Solved
Free energy differs from total energy because: - ✔✔It is available to do
work.
Life relies on two key reactions: the oxidation of glucose to produce CO2
and water and the reaction of CO2 and water to produce glucose. These
reactions are: - ✔✔Exergonic and endergonic, respectively
A reaction that is exergonic AND spontaneous - ✔✔Only occurs if the
reactants have enough energy to get over the activation barrier
When you clean your room, you create order from chaos. Most of the
following statements are true. Which one is not? - ✔✔Cleaning leads to
an increase in the order in the universe
Gibbs came up with his famous equation to determine if a reaction is
spontaneous or not: Δ G = Δ H − T Δ S. Which of the following reactions
is/are likely to occur at room temperature? - ✔✔Reactions A and C
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A: Δ H (J/mole) = 100; Δ S (J/mole K) = 1
C: Δ H (J/mole) = 100; Δ S (J/mole K) = 1
Organisms are typically open systems. What is an example of something
that is not open with regards exchanging mass? - ✔✔The entire earth
What is the best description of the relationship between autotrophs and
heterotrophs? - ✔✔Although an autotroph is relatively self sufficient, it
does exchange matter with heterotrophs.
ATP is a great source of energy that enable organisms to do work. What
kind(s) of work is it good for? - ✔✔It phosphorylates metabolites to
perform chemical work and proteins to perform physical work.
Which scientist first described free energy and had it named after him? -
✔✔Gibbs
When do spontaneous reactions occur? - ✔✔They can happen if the
reactants have enough energy to get over any energy barrier.
Enzymes are useful in chemical reactions because... - ✔✔They lower
the activation energy for the reaction.
Membranes form spontaneously from phospholipid monomers because
bringing the monomers close together frees up the water molecules that
, ©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
surrounded them. This decreases the entropy of assembly of the
monomers, but increases to a greater extent the entropy of the water
molecules. - ✔✔True
What are chaperonins and when are they needed? - ✔✔Chaperonins
may be needed to provide a controlled environment for larger biological
structures to assemble.
What is the trade off that all organisms make to achieve ordered structures
for life? - ✔✔Trade organismal order for disorder in their surroundings.
What does the formation of folded proteins and membranes have in
common? - ✔✔both folded proteins and membranes decrease in entropy
while their surroundings increase in entropy
Why can comparisons between DNA or amino acid sequences be used like
a molecular clock? - ✔✔They acquire substitutions at a steady rate with
each sequence change acting as the tick of the clock.
You can compare the gene sequences for a pair of organisms to see what
fraction of the sites are the same. As the pair of organisms become
evolutionarily further apart, the sequence similarity decreases. For large
evolutionary times, the sequence similarity will decrease to 25% though
BSCI 207 Unit 1 Exam Questions and
Answers 100% Solved
Free energy differs from total energy because: - ✔✔It is available to do
work.
Life relies on two key reactions: the oxidation of glucose to produce CO2
and water and the reaction of CO2 and water to produce glucose. These
reactions are: - ✔✔Exergonic and endergonic, respectively
A reaction that is exergonic AND spontaneous - ✔✔Only occurs if the
reactants have enough energy to get over the activation barrier
When you clean your room, you create order from chaos. Most of the
following statements are true. Which one is not? - ✔✔Cleaning leads to
an increase in the order in the universe
Gibbs came up with his famous equation to determine if a reaction is
spontaneous or not: Δ G = Δ H − T Δ S. Which of the following reactions
is/are likely to occur at room temperature? - ✔✔Reactions A and C
, ©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
A: Δ H (J/mole) = 100; Δ S (J/mole K) = 1
C: Δ H (J/mole) = 100; Δ S (J/mole K) = 1
Organisms are typically open systems. What is an example of something
that is not open with regards exchanging mass? - ✔✔The entire earth
What is the best description of the relationship between autotrophs and
heterotrophs? - ✔✔Although an autotroph is relatively self sufficient, it
does exchange matter with heterotrophs.
ATP is a great source of energy that enable organisms to do work. What
kind(s) of work is it good for? - ✔✔It phosphorylates metabolites to
perform chemical work and proteins to perform physical work.
Which scientist first described free energy and had it named after him? -
✔✔Gibbs
When do spontaneous reactions occur? - ✔✔They can happen if the
reactants have enough energy to get over any energy barrier.
Enzymes are useful in chemical reactions because... - ✔✔They lower
the activation energy for the reaction.
Membranes form spontaneously from phospholipid monomers because
bringing the monomers close together frees up the water molecules that
, ©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
surrounded them. This decreases the entropy of assembly of the
monomers, but increases to a greater extent the entropy of the water
molecules. - ✔✔True
What are chaperonins and when are they needed? - ✔✔Chaperonins
may be needed to provide a controlled environment for larger biological
structures to assemble.
What is the trade off that all organisms make to achieve ordered structures
for life? - ✔✔Trade organismal order for disorder in their surroundings.
What does the formation of folded proteins and membranes have in
common? - ✔✔both folded proteins and membranes decrease in entropy
while their surroundings increase in entropy
Why can comparisons between DNA or amino acid sequences be used like
a molecular clock? - ✔✔They acquire substitutions at a steady rate with
each sequence change acting as the tick of the clock.
You can compare the gene sequences for a pair of organisms to see what
fraction of the sites are the same. As the pair of organisms become
evolutionarily further apart, the sequence similarity decreases. For large
evolutionary times, the sequence similarity will decrease to 25% though
