chapter 3 biochemistry table of contentss3.amazonaws.com/scschoolfiles/136/mb_03_win.pdf · section...
TRANSCRIPT
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Biochemistry Chapter 3
Table of Contents
Section 1 Carbon Compounds
Section 2 Molecules of Life
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Section 1 Carbon Compounds
Chapter 3
Objectives
• Distinguish between organic and inorganic compounds.
• Explain the importance of carbon bonding in biological
molecules.
• Identify functional groups in biological molecules.
• Summarize how large carbon molecules are synthesized and
broken down.
• Describe how the breaking down of ATP supplies energy to
drive chemical reactions.
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Section 1 Carbon Compounds
Chapter 3
Carbon Bonding
• Organic compounds contain carbon atoms and are
found in living things.
• Most inorganic compounds do not contain carbon
atoms.
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Section 1 Carbon Compounds
Chapter 3
Carbon Bonding, continued
• Carbon atoms can readily form four covalent bonds
with other atoms including other carbon atoms. The
carbon bonds allow the carbon atoms to form a wide
variety of simple and complex organic compounds.
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Chapter 3
Carbon Bonding
Section 1 Carbon Compounds
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Section 1 Carbon Compounds
Chapter 3
Functional Groups
• Functional groups are groups of atoms that
influence the properties of molecules and the
chemical reactions in which the molecules
participate.
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Section 1 Carbon Compounds
Chapter 3
Large Carbon Molecules
• Condensation reactions join monomers (small
simple molecules) to form polymers. A condensation
reaction releases water as a by-product.
• In a hydrolysis reaction, water is used to split
polymers into monomers.
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Section 1 Carbon Compounds
Chapter 3
Energy Currency
• Adenosine triphosphate (ATP) stores and releases
energy during cell processes, enabling organisms to
function.
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Chapter 3
Comparing ADP and ATP
Section 1 Carbon Compounds
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Section 2 Molecules of Life
Chapter 3
Objectives
• Distinguish between monosaccharides, disaccharides,and
polysaccharides.
• Explain the relationship between amino acids and protein
structure.
• Describe the induced fit model of enzyme action.
• Compare the structure and function of each of the different
types of lipids.
• Compare the nucleic acids DNA and RNA.
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Section 2 Molecules of Life
Chapter 3
Carbohydrates
• Carbohydrates are organic compounds composed
of carbon, hydrogen, and oxygen in a ratio of about
one carbon to two hydrogen atoms to one oxygen
atom.
• Carbohydrates are a source of energy and are used
as structural materials in organisms.
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Chapter 3
Carbohydrates
Section 2 Molecules of Life
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Section 2 Molecules of Life
Chapter 3
Carbohydrates, continued
• Monosaccharides
– Carbohydrates are made up of monomers called
monosaccharides.
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Section 2 Molecules of Life
Chapter 3
Carbohydrates, continued
• Disaccharides and Polysaccharides
– Two monosaccharides join to form a double sugar
called a disaccharide.
– A complex sugar, or polysaccharide, is made of
three or more monosaccharides.
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Chapter 3
Disaccharides
Section 2 Molecules of Life
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Section 2 Molecules of Life
Chapter 3
Proteins
• Proteins are organic compounds composed mainly
of carbon, hydrogen, oxygen, and nitrogen.
• Proteins have many functions including structural,
defensive, and catalytic roles.
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Section 2 Molecules of Life
Chapter 3
Proteins, continued
• Amino Acids
– Proteins are made up of monomers called amino
acids. The sequence of amino acids determines a
protein’s shape and function.
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Chapter 3
Amino Acid
Section 2 Molecules of Life
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Section 2 Molecules of Life
Chapter 3
Proteins, continued
• Dipeptides and Polypeptides
– Two amino acids are joined by peptide bonds to
form a dipeptide.
– A long chain of amino acids is called a
polypeptide.
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Chapter 3
Structure of Proteins
Section 2 Molecules of Life
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Section 2 Molecules of Life
Chapter 3
Proteins, continued
• Enzymes
– Enzymes speed up chemical reactions and bind
to specific substrates.
– The binding of a substrate with an enzyme causes
a change in the enzyme’s shape and reduces the
activation energy of the reaction.
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Chapter 3
Enzyme Activity
Section 2 Molecules of Life
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Section 2 Molecules of Life
Chapter 3
Lipids
• Lipids are nonpolar molecules that store energy and
are an important part of cell membranes.
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Chapter 3
Fats
Section 2 Molecules of Life
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Section 2 Molecules of Life
Chapter 3
Lipids, continued
• Fatty Acids
– Most lipids contain fatty acids, unbranched
carbon molecules that have a hydrophilic end and
a hydrophobic end.
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Chapter 3
Fatty Acids
Section 2 Molecules of Life
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Section 2 Molecules of Life
Chapter 3
Lipids, continued
• Triglycerides
– Triglycerides consist of three fatty acids and one
molecule of glycerol.
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Section 2 Molecules of Life
Chapter 3
Lipids, continued
• Phospholipids
– Phospholipids, which make up cell membranes,
consist of two fatty acids and one glycerol
molecule.
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Section 2 Molecules of Life
Chapter 3
Lipids, continued
• Waxes
– A wax is made of one long fatty acid chain joined
to one long alcohol.
• Steroids
– A steroid is composed of four fused carbon rings.
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Section 2 Molecules of Life
Chapter 3
Nucleic Acids
• A nucleic acid is a large and complex organic
molecule that stores and transports information.
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Chapter 3
Structure of Nucleic Acids
Section 2 Molecules of Life
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Chapter 3
Nucleic Acids
Section 2 Molecules of Life
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Section 2 Molecules of Life
Chapter 3
Nucleic Acids, continued
• The nucleic acid deoxyribonucleic acid (DNA)
contains genetic information for cell activities.
• Ribonucleic acid (RNA) molecules play many key
roles in building of proteins and can act as enzymes.
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Chapter 3
DNA Overview
Section 2 Molecules of Life
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Chapter 3
Ribonucleic Acid (RNA)
Section 2 Molecules of Life
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Multiple Choice
1. Which of the following is not a function of
polysaccharides?
A. energy source
B. energy storage
C. structural support
D. storage of genetic information
Standardized Test Prep Chapter 3
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Multiple Choice, continued
1. Which of the following is not a function of
polysaccharides?
A. energy source
B. energy storage
C. structural support
D. storage of genetic information
Standardized Test Prep Chapter 3
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Multiple Choice, continued
2. Which of the following statements is false?
F. A wax is a lipid.
G. Starch is a lipid.
H. Saturated fats are solid at room temperature.
J. Unsaturated fats are liquid at room temperature.
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Multiple Choice, continued
2. Which of the following statements is false?
F. A wax is a lipid.
G. Starch is a lipid.
H. Saturated fats are solid at room temperature.
J. Unsaturated fats are liquid at room temperature.
Standardized Test Prep Chapter 3
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Multiple Choice, continued
3. Which of the following molecules stores hereditary
information?
A. ATP
B. DNA
C. protein
D. carbohydrates
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Multiple Choice, continued
3. Which of the following molecules stores hereditary
information?
A. ATP
B. DNA
C. protein
D. carbohydrates
Standardized Test Prep Chapter 3
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Multiple Choice, continued
4. What is the name of the molecule in plants that
stores sugars?
F. starch
G. protein
H. cellulose
J. glycogen
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Multiple Choice, continued
4. What is the name of the molecule in plants that
stores sugars?
F. starch
G. protein
H. cellulose
J. glycogen
Standardized Test Prep Chapter 3
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Multiple Choice, continued
5. Which of the following
molecules make up the
basic structure of a cell
membrane?
A. waxes
B. steroids
C. fatty acids
D. phospholipids
Chapter 3
The figure below illustrates
the basic structure of a cell
membrane. Use the
figure to answer the questions
that follow.
Standardized Test Prep
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Multiple Choice, continued
5. Which of the following
molecules make up the
basic structure of a cell
membrane?
A. waxes
B. steroids
C. fatty acids
D. phospholipids
Chapter 3
The figure below illustrates
the basic structure of a cell
membrane. Use the
figure to answer the questions
that follow.
Standardized Test Prep
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Multiple Choice, continued
6. The “tails” of the molecules
in the figure orient away
from water. Which of the
following describes the
tail’s movement away from
water?
F. polar
G. adhesive
H. hydrophilic
J. hydrophobic
Chapter 3
The figure below illustrates
the basic structure of a cell
membrane. Use the
figure to answer the questions
that follow.
Standardized Test Prep
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Multiple Choice, continued
6. The “tails” of the molecules
in the figure orient away
from water. Which of the
following describes the
tail’s movement away from
water?
F. polar
G. adhesive
H. hydrophilic
J. hydrophobic
Chapter 3
The figure below illustrates
the basic structure of a cell
membrane. Use the
figure to answer the questions
that follow.
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Multiple Choice, continued
7. simple sugars : carbohydrates :: amino acids :
A. lipids
B. proteins
C. nucleic acids
D. amino acids
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Multiple Choice, continued
7. simple sugars : carbohydrates :: amino acids :
A. lipids
B. proteins
C. nucleic acids
D. amino acids
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Multiple Choice, continued
8. What is the name of the
functional group circled in the
structural formula?
F. amino
G. hydroxyl
H. phosphate
J. carboxyl
Chapter 3
The figure below represents
the structural formula of a
molecule. Use the
figure to answer the question
that follows.
Standardized Test Prep
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Multiple Choice, continued
8. What is the name of the
functional group circled in the
structural formula?
F. amino
G. hydroxyl
H. phosphate
J. carboxyl
Chapter 3
The figure below represents
the structural formula of a
molecule. Use the
figure to answer the question
that follows.
Standardized Test Prep
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Short Response
Proteins are affected by environmental conditions
such as heat and pH.
Explain why the process of cooking an egg cannot be
reversed.
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Short Response, continued
Proteins are affected by environmental conditions
such as heat and pH.
Explain why the process of cooking an egg cannot be
reversed.
Answer:
The heat that is added to the egg changes the bonds
in the proteins and other molecules that make up the
egg to such a large extent that the original protein
shape can no longer be distinguished.
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Extended Response
Enzymes are essential for the functioning of all cells.
Part A Explain what enzymes do that is essential for
cell function.
Part B Explain the induced fit model of enzyme
action.
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Extended Response, continued
Answer:
Part A Enzymes catalyze chemical reactions that are involved in important cell processes.
Part B Bonding of the substrates to enzymes causes a slight change in the enzyme’s shape, thereby weakening some of the bonds and lowering activation energy.
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Resources Chapter menu
Section 1 Carbon Compounds
Chapter 3
Energy Currency