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WorksheetsUnit 4 BioChem Review
Total questions: 20
Worksheet time: 2hrs 38mins
Name
Class
Date
1.
The distinction between inorganic and organic compounds is not always clear when dealing with open and closed systems, because everything is ultimately connected to everything else on the planet. Which of the following features of organic compounds is NOT found in inorganic compounds?
a)
oxygen
b)
hydrogen bonds
c)
ionizing chemical groups
d)
carbon atoms covalently bonded to each other
2.
Scientists use the pH scale to quantify the amount of hydrogen ions in aqueous solution. Which of the following is a correct statement about the relationship between pH and the hydrogen-ion concentration of a solution?
a)
There are no hydrogen ions present in a solution with a basic pH.
b)
There are no hydrogen ions present in a solution with a neutral pH of 7.0.
c)
The concentration of hydrogen ions in a solution with a pH of 7.0 is 100 times as great as that in a solution with a pH of 9.0.
d)
The concentration of hydrogen ions in a solution with a pH of 4.0 is 400 times as great as that in a solution with a pH of 1.0.
3.
A + B + energy → AB
There are many types of biochemical reactions taking place in any living system. Which of the following best characterizes the reaction represented above?
There are many types of biochemical reactions taking place in any living system. Which of the following best characterizes the reaction represented above?
a)
Catabolism
b)
Oxidation-reduction
c)
Exergonic reaction
d)
Endergonic reaction
4.
Water’s unique properties make life on Earth possible. Which of the following is most directly responsible for water’s unique properties?
a)
It contains oxygen atoms
b)
It contains hydrogen atoms
c)
It forms hydrogen bonds
d)
It is nonpolar
5.
The structure in the diagram could be any of the following EXCEPT a
a)
nucleotide
b)
monomer used as a component of a polypeptide
c)
reactant used in the synthesis of nucleic acids
d)
molecule that is the energy source for most anabolic activity in cells
6.
So-called high-energy bonds include the bonds at
a)
A and B only
b)
B and C only
c)
C and D only
d)
D and E only
7.
Based on proper experimental protocol, which of the following would best serve as the control for this experiment? A
a)
flask A only
b)
flask B only
c)
flask C only
d)
flasks A and B
8.
Each of the flasks is tested for the presence of sugar by adding 1.0 mL of Benedict’s reagent to a 10 mL sample from each flask and heating each sample in a water bath for 5 minutes. Which of the following would most likely test positive for the presence of sugar?
a)
flask A only
b)
flask B only
c)
flask C only
d)
flasks A and C
9.
Support for the hypothesis of enzyme denaturation can be obtained by comparing starch digestion in
a)
flasks A and B after 5 minutes
b)
flasks B and C after 5 minutes
c)
flasks A and C after 5 minutes
d)
flask A at time zero and again after 5 minute
10.
Fats consist of a wide group of compounds that are generally soluble in organic solvents and generally insoluble in water. Chemically, fats are triglycerides, triesters of glycerol and any of several fatty acids. Fats may be either solid or liquid at room temperature, depending on their structure and composition. Which of the following is essential for the synthesis of neural fats?
a)
Glucose
b)
Glycerol
c)
Glycogen
d)
Glucagon
11.
A carbohydrate is an organic compound that consists only of carbon, hydrogen, and oxygen, usually with a hydrogen:oxygen atom ratio of 2:1; in other words, with the empirical formula Cm(H2O)n. Which of the following is a storage form of carbohydrate in muscle?
a)
Glucose
b)
Glycerol
c)
Glycogen
d)
Glucagon
12.
Chlorophyll is a green pigment found in cyanobacteria and the chloroplasts of algae and plants. Chlorophyll is an extremely important biomolecule, critical in photosynthesis, which allows plants to absorb energy from light. Which of the following is a constituent of the chlorophyll molecule?
a)
Iron
b)
Zinc
c)
Magnesium
d)
Sulfur
13.
Which of the following is required in ionic form for the activity of many enzymes, the maintenance of bone, and the contraction of muscle fibers?
a)
Iron
b)
Zinc
c)
Magnesium
d)
Calcium
14.
Biopolymers are polymers produced by living organisms. Since they are polymers, biopolymers contain monomeric units that are covalently bonded to form larger structures. Which of the following biopolymers includes glycogen, chitin, cellulose and glucose?
a)
Protrins
b)
Cabohydraqtes
c)
Nucleic Acids
d)
Lipids
15.
A wide range of marine mammals and fish live in the severe conditions of the Arctic ocean. Whales, dolphins, walruses and seals all make their home in this North Polar region which is covered by ice most of the year. Which of the following is used for insulation and buoyancy in marine Arctic animals?
a)
Proteins
b)
Carbohydrates
c)
Nucleic Acids
d)
Lipids
16.
The genetic code is the set of rules by which information encoded within genetic material is translated into proteins by living cells. The genetic code is highly similar among all organisms, and can be expressed in a simple table with 64 entries. Which of the following is used to carry the genetic code?
a)
Porteins
b)
Carbohydrates
c)
Nucleic Acids
d)
Lipids
17.
Within complex biological systems, many chemical reactions that, by themselves, require energy input (have a positive free-energy change or +Delta G) can occur because the reactions
a)
may be coupled to the hydrolysis of ATP
b)
take place very slowly
c)
take place when the cells are at unusually high temperatures
d)
are catalyzed by enzymes
18.
Adenosine triphosphate or ATP is composed of adenine, ribose and three phosphate groups. The phosphate groups have a negative charge and as a result the bonds holding them onto the molecule are weak thus easily broken. Which of the following best explains why ATP serves as a common energy source for organisms?
a)
ATP is the smallest energy molecule.
b)
ATP energy can be easily transferred to do cellular work.
c)
ATP is extremely stable and can be stored in the cell for long periods of time.
d)
Traces of ATP have been found in fossils of ancient organisms dating back to the beginning of life on Earth.
19.
Aqueous buffer solutions are common in biochemical systems and are beneficial in that they resist changes in pH. Which of the following methods for the transport of CO2 provides a buffering system for the blood?
a)
CO2 is dissolved in the plasma.
b)
CO2 combines with H2O to form carbonic acid and then bicarbonate.
c)
CO2 combines with hemoglobin to form carboxyhemoglobin
d)
CO2 is converted to CO for plasma transport.
20.
Anabolism is the set of metabolic pathways that construct molecules from smaller units. These reactions require energy. The synthesis of protein or carbohydrate polymers always produces which of the following as a byproduct of these synthesis reactions?
a)
ATP
b)
Carbon dioxide
c)
Urea
d)
Water
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