BS 161 EXAM 1 STUDY QUESTIONS
WITH CORRECT ANSWERS LATEST
EDITION
1. What is the difference in the bonding between alpha-helix and beta sheets? -
ANSWER Hydrogen bonding occurs between the amides of adjacent chains
in the sheets instead of between the amides in different parts of the helices.
2. Organic molecules have a carbon backbone and _____ such as -OH and -
NH2 that can form hydrogen bonds - ANSWER functional groups
3. Phospholipids are made up of: - ANSWER a phosphate, two fatty acids and
a glycerol.
4. Proteins are polymers formed of structural units called: - ANSWER amino
acids.
5. Proteins are created with: - ANSWER peptide bonds.
6. The covalent bonds connecting monomer units in sugars can be formed by
the removal of a water molecule. This reaction is referred to as: - ANSWER
a dehydration reaction.
7. Common lipids for energy storage are: - ANSWER triglycerides.
,8. A DNA strand contains 20 purines and 26 pyrimidines. How many purines
will the complementary strand contain? - ANSWER 26
9. 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? - ANSWER α - glucose
and β - glucose are stereoisomers with OH groups oriented differently.
10.A symporter is moving glucose and sodium levels are being depleted in
extracellular fluids. What can be concluded about the movement of glucose?
- ANSWER -Glucose would be moving against its gradient into the cell
-Glucose follows the movement of sodium into the cell
-ATP is not required directly by the symporter
-Energy is needed to move glucose up its concentration gradient
-Glucose's movement is considered a part of coupled transport
11.The ultimate source of energy for humans comes from what source? -
ANSWER The sun
12.It is summer, and you are excited about going to your local amusement park,
and specifically about riding the new roller coaster that was just built. You
imagine waiting at the top of the stairs for the roller coaster to pull into the
station, climbing into the car, strapping yourself into the seatbelt, and pulling
down the harness. You can imagine the cars slowly chugging up to the top of
the first hill, coming down on the other side, and the excitement you expect
to feel as you go along for the ride. Of all of the things that you have
imagined, which is an example of potential energy? - ANSWER Waiting at
the top of the stairs for the roller coaster to pull into the station
, 13.When an atom or molecule gains one or more electrons, it is said to be -
ANSWER reduced.
14.In a chemical reaction, glyceraldehyde-3-phosphate + NAD+ yields 1,3-
bisphosphoglycerate + NADH. In this reaction, what happened to NAD+? -
ANSWER It was reduced to form NADH
15.Glucose is broken down through cellular respiration, which involves a large
number of chemical reactions. At the end of the cellular respiration process,
a large number of ATP molecules are generated, yet not all of the possible
energy that is contained in a molecule of glucose can be harnessed through
these chemical reactions to generate ATP. In other words, during cellular
respiration, not all of the energy that is contained in a molecule of glucose is
converted into the energy stored in ATP. The remaining energy is -
ANSWER lost as heat.
16.You return home to find that your baby brother has scattered his toy trains
and trucks all over the floor of your room. As you begin to pick up the toys
and put them away, you realize that even though he is just a baby, he has
clearly mastered - ANSWER the second law of thermodynamics.
17.In a chemical reaction, 1,3-bisphosphoglycerate + ADP yields 3-
phosphoglycerate plus ATP. The delta G for this reaction is - ANSWER less
than zero.
18.The synthesis of sugar molecules through the process of photosynthesis
requires energy absorbed from sunlight. Bearing this in mind, what kind of
reaction is photosynthesis? - ANSWER endergonic
WITH CORRECT ANSWERS LATEST
EDITION
1. What is the difference in the bonding between alpha-helix and beta sheets? -
ANSWER Hydrogen bonding occurs between the amides of adjacent chains
in the sheets instead of between the amides in different parts of the helices.
2. Organic molecules have a carbon backbone and _____ such as -OH and -
NH2 that can form hydrogen bonds - ANSWER functional groups
3. Phospholipids are made up of: - ANSWER a phosphate, two fatty acids and
a glycerol.
4. Proteins are polymers formed of structural units called: - ANSWER amino
acids.
5. Proteins are created with: - ANSWER peptide bonds.
6. The covalent bonds connecting monomer units in sugars can be formed by
the removal of a water molecule. This reaction is referred to as: - ANSWER
a dehydration reaction.
7. Common lipids for energy storage are: - ANSWER triglycerides.
,8. A DNA strand contains 20 purines and 26 pyrimidines. How many purines
will the complementary strand contain? - ANSWER 26
9. 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? - ANSWER α - glucose
and β - glucose are stereoisomers with OH groups oriented differently.
10.A symporter is moving glucose and sodium levels are being depleted in
extracellular fluids. What can be concluded about the movement of glucose?
- ANSWER -Glucose would be moving against its gradient into the cell
-Glucose follows the movement of sodium into the cell
-ATP is not required directly by the symporter
-Energy is needed to move glucose up its concentration gradient
-Glucose's movement is considered a part of coupled transport
11.The ultimate source of energy for humans comes from what source? -
ANSWER The sun
12.It is summer, and you are excited about going to your local amusement park,
and specifically about riding the new roller coaster that was just built. You
imagine waiting at the top of the stairs for the roller coaster to pull into the
station, climbing into the car, strapping yourself into the seatbelt, and pulling
down the harness. You can imagine the cars slowly chugging up to the top of
the first hill, coming down on the other side, and the excitement you expect
to feel as you go along for the ride. Of all of the things that you have
imagined, which is an example of potential energy? - ANSWER Waiting at
the top of the stairs for the roller coaster to pull into the station
, 13.When an atom or molecule gains one or more electrons, it is said to be -
ANSWER reduced.
14.In a chemical reaction, glyceraldehyde-3-phosphate + NAD+ yields 1,3-
bisphosphoglycerate + NADH. In this reaction, what happened to NAD+? -
ANSWER It was reduced to form NADH
15.Glucose is broken down through cellular respiration, which involves a large
number of chemical reactions. At the end of the cellular respiration process,
a large number of ATP molecules are generated, yet not all of the possible
energy that is contained in a molecule of glucose can be harnessed through
these chemical reactions to generate ATP. In other words, during cellular
respiration, not all of the energy that is contained in a molecule of glucose is
converted into the energy stored in ATP. The remaining energy is -
ANSWER lost as heat.
16.You return home to find that your baby brother has scattered his toy trains
and trucks all over the floor of your room. As you begin to pick up the toys
and put them away, you realize that even though he is just a baby, he has
clearly mastered - ANSWER the second law of thermodynamics.
17.In a chemical reaction, 1,3-bisphosphoglycerate + ADP yields 3-
phosphoglycerate plus ATP. The delta G for this reaction is - ANSWER less
than zero.
18.The synthesis of sugar molecules through the process of photosynthesis
requires energy absorbed from sunlight. Bearing this in mind, what kind of
reaction is photosynthesis? - ANSWER endergonic
