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BSC 2010 Questions with Answers (100%
Correct Answers)
A single bacterium divides into two bacteria that are identical to, but smaller
than, the original bacterium. Which characteristic of life does this best describe?
Answer: replication of genetic material for reproduction
Why did the ancient evolution of photosynthesis in the ancient ocean allow
organisms to colonize land? Answer: ozone formation created a habitable
environment (with oxygen, you get ozone formation)
True or False, Organization (ex building molecules, constructing tissues) in life
requires energy Answer: True
True or False, You hypothesize that increased light levels will enhance
growth of your houseplants. You test this hypothesis, moving the
plants to an area in your home with more light. Over several weeks,
and you find that the plants begins to look fuller and healthier . This
result proves your original hypothesis. Answer: False, you don't prove a
hypothesis is true your findings support that hypothesis but there are many
alternatives that can be tested
An atom with _____ has an atomic number of 14 (atomic number refers to
protons) Answer: so this atom also has 14 protons
What determines if a molecule is polar or non-polar? Answer: the differences in
the electronegativities between the atoms (an atom's attraction for the electrons
in a bond)
Small molecules containing several hydroxyl groups are typically... Answer:
Soluble in water, used for hydrogen bonding with water leading to solubility
Which of these molecules contains only nonpolar bonds? Answer: O2
,2
An atom has an atomic number of 12. Assuming neutrality, how many valence
electrons does it have? Answer: 2
Which factor defines whether a reaction is endergonic? Answer: Delta G
During a typical hydrolysis reaction in cells, the energy required to break bonds
in the substrate is ______ the energy released when bonds are formed in the
products. Answer: Less than (hydrolysis= exergonic)
Gibbs fres energy is negative for _______ reactions, which are typically
associated with a ________ change in enthalpy and a ________ change in
entropy Answer: Exergonic, Negative, and Positive
True or False, Energy can be transformed during metabolic reactions. Answer:
True
True or False, For each reaction in a metabolic pathway, a small amount of
energy disappears due to the increase in entropy. Answer: False (energy
NEVER disappears
True or False, Endergonic and Exergonic reactions can both involve breaking
of bonds. Answer: True, (Yes, bonds must be broken in the reactants regardless
of whether the reaction is exergonic or endergonic)
Which of the following relationships are not accurate? Answer: Hydrolysis-
water is released, also not accurate because it is CONSUMED
Endergonic- negative Delta G, this would be the answer because it is NOT
accurate, it should be Endergonic- Positive Delta G
Margarine is a butter substitute that is solid at room
temperature. It is made from vegetable oils (often soybean or
canola oil). The label on a container of margarine lists
"hydrogenated vegetable oil" as the major ingredient. Which
, 3
statement below best explains this? Answer: The margarine stays solid at room
temperature because the
fatty acids in the triglycerides are saturated.
In order to maintain an ideal membrane fluidity, cells of a fish
can make chemical modifications to their membranes to deal
with changes in temperature. How might you expect the lipids
in a fish from warmer water to compare to those in a fish from
colder water? Answer: Lipids will have more saturated fatty acids in the
warmer
water fish.
______ bonds are formed during anabolic reactions in the synthesis of
macromolecules. In lipids there are _______ bonds, whereas in carbohydrates
there are _______ bonds Answer: Covalent, Ester, Glycosidic
True or False, All carbohydrates are polymers. Answer: False, (carbs include
all sugars (mono-, di-, and poly-saccharides)
Maltose, or malt sugar, is composed of two glucose molecules
bound by a glycosidic linkage. How can maltose be classified?
Choose all that apply. Answer: as a disaccharide
Click on the Glycosidic bond Answer: O by itself in the middle
Which of the following is matched correctly with its building block(s)? Answer:
Triglycerides- glycerol and fatty acids
True or False, bonding between A-T is stronger than C-G in double stranded
DNA. Answer: False, (A-T form 2 hydrogen bonds, G-C form 3 hydrogen
bonds so G-C pair is stronger)
BSC 2010 Questions with Answers (100%
Correct Answers)
A single bacterium divides into two bacteria that are identical to, but smaller
than, the original bacterium. Which characteristic of life does this best describe?
Answer: replication of genetic material for reproduction
Why did the ancient evolution of photosynthesis in the ancient ocean allow
organisms to colonize land? Answer: ozone formation created a habitable
environment (with oxygen, you get ozone formation)
True or False, Organization (ex building molecules, constructing tissues) in life
requires energy Answer: True
True or False, You hypothesize that increased light levels will enhance
growth of your houseplants. You test this hypothesis, moving the
plants to an area in your home with more light. Over several weeks,
and you find that the plants begins to look fuller and healthier . This
result proves your original hypothesis. Answer: False, you don't prove a
hypothesis is true your findings support that hypothesis but there are many
alternatives that can be tested
An atom with _____ has an atomic number of 14 (atomic number refers to
protons) Answer: so this atom also has 14 protons
What determines if a molecule is polar or non-polar? Answer: the differences in
the electronegativities between the atoms (an atom's attraction for the electrons
in a bond)
Small molecules containing several hydroxyl groups are typically... Answer:
Soluble in water, used for hydrogen bonding with water leading to solubility
Which of these molecules contains only nonpolar bonds? Answer: O2
,2
An atom has an atomic number of 12. Assuming neutrality, how many valence
electrons does it have? Answer: 2
Which factor defines whether a reaction is endergonic? Answer: Delta G
During a typical hydrolysis reaction in cells, the energy required to break bonds
in the substrate is ______ the energy released when bonds are formed in the
products. Answer: Less than (hydrolysis= exergonic)
Gibbs fres energy is negative for _______ reactions, which are typically
associated with a ________ change in enthalpy and a ________ change in
entropy Answer: Exergonic, Negative, and Positive
True or False, Energy can be transformed during metabolic reactions. Answer:
True
True or False, For each reaction in a metabolic pathway, a small amount of
energy disappears due to the increase in entropy. Answer: False (energy
NEVER disappears
True or False, Endergonic and Exergonic reactions can both involve breaking
of bonds. Answer: True, (Yes, bonds must be broken in the reactants regardless
of whether the reaction is exergonic or endergonic)
Which of the following relationships are not accurate? Answer: Hydrolysis-
water is released, also not accurate because it is CONSUMED
Endergonic- negative Delta G, this would be the answer because it is NOT
accurate, it should be Endergonic- Positive Delta G
Margarine is a butter substitute that is solid at room
temperature. It is made from vegetable oils (often soybean or
canola oil). The label on a container of margarine lists
"hydrogenated vegetable oil" as the major ingredient. Which
, 3
statement below best explains this? Answer: The margarine stays solid at room
temperature because the
fatty acids in the triglycerides are saturated.
In order to maintain an ideal membrane fluidity, cells of a fish
can make chemical modifications to their membranes to deal
with changes in temperature. How might you expect the lipids
in a fish from warmer water to compare to those in a fish from
colder water? Answer: Lipids will have more saturated fatty acids in the
warmer
water fish.
______ bonds are formed during anabolic reactions in the synthesis of
macromolecules. In lipids there are _______ bonds, whereas in carbohydrates
there are _______ bonds Answer: Covalent, Ester, Glycosidic
True or False, All carbohydrates are polymers. Answer: False, (carbs include
all sugars (mono-, di-, and poly-saccharides)
Maltose, or malt sugar, is composed of two glucose molecules
bound by a glycosidic linkage. How can maltose be classified?
Choose all that apply. Answer: as a disaccharide
Click on the Glycosidic bond Answer: O by itself in the middle
Which of the following is matched correctly with its building block(s)? Answer:
Triglycerides- glycerol and fatty acids
True or False, bonding between A-T is stronger than C-G in double stranded
DNA. Answer: False, (A-T form 2 hydrogen bonds, G-C form 3 hydrogen
bonds so G-C pair is stronger)
