BS 161 Exam one review UPDATED
ACTUAL Questions and CORRECT
Answers
What is the difference in the bonding between alpha-helix and beta sheets? - CORRECT
ANSWER - Hydrogen bonding occurs between the amides of adjacent chains in the sheets
instead of between the amides in different parts of the helices.
Organic molecules have a carbon backbone and _____ such as -OH and -NH2 that can form
hydrogen bonds - CORRECT ANSWER - functional groups
Phospholipids are made up of: - CORRECT ANSWER - a phosphate, two fatty acids and a
glycerol.
Proteins are polymers formed of structural units called: - CORRECT ANSWER - amino
acids.
Proteins are created with: - CORRECT ANSWER - peptide bonds.
The covalent bonds connecting monomer units in sugars can be formed by the removal of a
water molecule. This reaction is referred to as: - CORRECT ANSWER - a dehydration
reaction.
Common lipids for energy storage are: - CORRECT ANSWER - triglycerides.
A DNA strand contains 20 purines and 26 pyrimidines. How many purines will the
complementary strand contain? - CORRECT ANSWER - 26
α - glucose is present in potatoes and β - glucose is present in wood. Both are glucose molecules
but one can be used by humans to synthesize ATP and one cannot. Based on this information,
what is the best explanation on why humans can only digest one of the glucose types? -
,CORRECT ANSWER - α - glucose and β - glucose are stereoisomers with OH groups
oriented differently.
Egg whites consist primarily of water and the protein albumin. When you fry an egg, why does
the egg white turn from clear to white? - CORRECT ANSWER - The protein becomes
denatured.
Which chemical group forms hydrogen bonds with water and is most likely to explain why
sugars dissolve well in water? - CORRECT ANSWER - -O-H
Atoms of a single element that possess different numbers of neutrons are called: - CORRECT
ANSWER - isotopes.
An atom has 20 electrons and 20 neutrons. What is the mass of this atom? - CORRECT
ANSWER - 40
The reaction (H2 + F2 → 2HF) is an example of a redox reaction. In reality, two half reactions
are occurring. The half reaction (H2 → 2H+ + 2e-) is a(n): - CORRECT ANSWER -
oxidation reaction
In the crystal matrix of ordinary salt, the sodium and chlorine are held together by: - CORRECT
ANSWER - ionic bonds.
Water molecules are attracted to each other due to the opposite charges created by partial charge
separations within the molecules. These attractions are called: - CORRECT ANSWER -
hydrogen bonds.
The negative logarithm of the hydrogen ion concentration in the solution is referred to as: -
CORRECT ANSWER - pH
, A chemist adds a chemical to pure water and there is a 100 fold increase in the concentration of
hydrogen ions. What is the best approximation of the new pH value? - CORRECT
ANSWER -5
Water is most dense and thus heaviest at 4oC. At 0oC, ice forms and can float on liquid water.
Suppose ice were most dense at 0oC. What would happen in a lake? - CORRECT
ANSWER - The ice would cover the bottom of the aquatic system and would build up in
layers over time.
The organelle that can collect, package, modify, and transport molecules is called the: -
CORRECT ANSWER - Golgi apparatus.
Given what is known about the minimal essential functions of cellular life, if you could create an
artificial cell, what cellular structures must you include? - CORRECT ANSWER -
ribosomes
The evolutionary process that created chloroplasts and mitochondria is: - CORRECT
ANSWER - endosymbiosis.
A cuboidal shaped cell with six sides is 1mm X 1mm X 1mm. What is the volume and the
surface area of the cell? - CORRECT ANSWER - 1mm3 : 6mm2
(SA = 6a^2, V =a^3 )
If you added a drug to a suspension of bacteria that inhibited their flagella they would not be able
to _____ - CORRECT ANSWER - move.
As a plant cell grows a new cell wall the secondary wall forms: - CORRECT ANSWER -
between the primary cell wall and plasma membrane.
The nucleolus is the site of: - CORRECT ANSWER - ribosome assembly.
ACTUAL Questions and CORRECT
Answers
What is the difference in the bonding between alpha-helix and beta sheets? - CORRECT
ANSWER - Hydrogen bonding occurs between the amides of adjacent chains in the sheets
instead of between the amides in different parts of the helices.
Organic molecules have a carbon backbone and _____ such as -OH and -NH2 that can form
hydrogen bonds - CORRECT ANSWER - functional groups
Phospholipids are made up of: - CORRECT ANSWER - a phosphate, two fatty acids and a
glycerol.
Proteins are polymers formed of structural units called: - CORRECT ANSWER - amino
acids.
Proteins are created with: - CORRECT ANSWER - peptide bonds.
The covalent bonds connecting monomer units in sugars can be formed by the removal of a
water molecule. This reaction is referred to as: - CORRECT ANSWER - a dehydration
reaction.
Common lipids for energy storage are: - CORRECT ANSWER - triglycerides.
A DNA strand contains 20 purines and 26 pyrimidines. How many purines will the
complementary strand contain? - CORRECT ANSWER - 26
α - glucose is present in potatoes and β - glucose is present in wood. Both are glucose molecules
but one can be used by humans to synthesize ATP and one cannot. Based on this information,
what is the best explanation on why humans can only digest one of the glucose types? -
,CORRECT ANSWER - α - glucose and β - glucose are stereoisomers with OH groups
oriented differently.
Egg whites consist primarily of water and the protein albumin. When you fry an egg, why does
the egg white turn from clear to white? - CORRECT ANSWER - The protein becomes
denatured.
Which chemical group forms hydrogen bonds with water and is most likely to explain why
sugars dissolve well in water? - CORRECT ANSWER - -O-H
Atoms of a single element that possess different numbers of neutrons are called: - CORRECT
ANSWER - isotopes.
An atom has 20 electrons and 20 neutrons. What is the mass of this atom? - CORRECT
ANSWER - 40
The reaction (H2 + F2 → 2HF) is an example of a redox reaction. In reality, two half reactions
are occurring. The half reaction (H2 → 2H+ + 2e-) is a(n): - CORRECT ANSWER -
oxidation reaction
In the crystal matrix of ordinary salt, the sodium and chlorine are held together by: - CORRECT
ANSWER - ionic bonds.
Water molecules are attracted to each other due to the opposite charges created by partial charge
separations within the molecules. These attractions are called: - CORRECT ANSWER -
hydrogen bonds.
The negative logarithm of the hydrogen ion concentration in the solution is referred to as: -
CORRECT ANSWER - pH
, A chemist adds a chemical to pure water and there is a 100 fold increase in the concentration of
hydrogen ions. What is the best approximation of the new pH value? - CORRECT
ANSWER -5
Water is most dense and thus heaviest at 4oC. At 0oC, ice forms and can float on liquid water.
Suppose ice were most dense at 0oC. What would happen in a lake? - CORRECT
ANSWER - The ice would cover the bottom of the aquatic system and would build up in
layers over time.
The organelle that can collect, package, modify, and transport molecules is called the: -
CORRECT ANSWER - Golgi apparatus.
Given what is known about the minimal essential functions of cellular life, if you could create an
artificial cell, what cellular structures must you include? - CORRECT ANSWER -
ribosomes
The evolutionary process that created chloroplasts and mitochondria is: - CORRECT
ANSWER - endosymbiosis.
A cuboidal shaped cell with six sides is 1mm X 1mm X 1mm. What is the volume and the
surface area of the cell? - CORRECT ANSWER - 1mm3 : 6mm2
(SA = 6a^2, V =a^3 )
If you added a drug to a suspension of bacteria that inhibited their flagella they would not be able
to _____ - CORRECT ANSWER - move.
As a plant cell grows a new cell wall the secondary wall forms: - CORRECT ANSWER -
between the primary cell wall and plasma membrane.
The nucleolus is the site of: - CORRECT ANSWER - ribosome assembly.
