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The Structure and Function of Macromolecules
AP Biology Chapter 5
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Macromolecules
Macromolecules are giant molecules .Four main classes of macromolecules are:
1. Carbohydrates2. Lipids3. Proteins4. Nucleic Acids
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Polymers
A polymer is a long molecule made of many similar or identical monomers (small molecules).Polymers are linked by covalent bonds.The covalent bonds occur through
condensation reactions called dehydration.The polymers are disassembled by a
hydrolysis reaction.
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Dehydration Reactions
Condensation involves a dehydration synthesis because a water is removed (dehydration) and a bond is made (synthesis). When two monomers join, a hydroxyl (OH)
group is removed from one monomer and a hydrogen (H) is removed from the other. This produces the water given off during a
condensation reaction.
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Carbohydrates
in short-term energy storage as intermediate-term energy storage
(starch for plants and glycogen for animals); as structural components in cells (cellulose
in the cell walls of plants and many protists), and chitin in the exoskeleton of insects and other arthropods.
Carbohydrates function:
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Monosaccharides
Monosaccharides are single (mono=one) sugars. Sugars are structurally the simplest
carbohydrates. They are the structural unit which makes
up the other types of carbohydrates. Important monosaccharides include
ribose, glucose, and fructose.
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Disaccharides
Disaccharides are formed when two monosaccharides are chemically bonded together. Sucrose, a common plant disaccharide is
composed of the monosaccharides glucose and fructose. Lactose, milk sugar, is a disaccharide
composed of glucose and the monosaccharide galactose.
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Polysaccharides
Polysaccharides are large molecules composed of individual monosaccharide units. A common plant polysaccharide is starch,
which is made up of many glucoses.Glycogen is an animal storage product
that accumulates in the vertebrate liver. Cellulose is a polysaccharide found in
plant cell walls. Cellulose forms the fibrous part of the plant cell wall.
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Amylopectin
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Lipids
Lipids are involved mainly with long-term energy storage. They are generally insoluble in polar
substances such as water. Secondary functions of lipids are as structural
components and as hormones that play roles in communications within and between cells. Lipids are composed of three fatty acids
(usually) covalently bonded to a 3-carbon glycerol.
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Fatty Acids
Fatty acids can be 1. saturated (meaning they have as
many hydrogens bonded to their carbons as possible) or
2. unsaturated (with one or more double bonds connecting their carbons, hence fewer hydrogens).
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Fats
A fat is solid at room temperature, while an oil is a liquid under the same conditions. The fatty acids in oils are mostly unsaturated, while those in fats are mostly saturated.
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Fats and Oils
Fats and oils function in energy storage. Animals convert excess sugars into fats. Most plants store excess sugars as starch, although some seeds and fruits have energy stored as oils
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Fats
Another use of fats is as insulators and cushions. The human body naturally accumulates some fats in the "posterior" area. Subdermal ("under the skin") fat plays a role in insulation.
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Phospholipids
Phospholipids and glycolipids are important structural components of cell membranes.
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Waxes
Waxes are an important structural component for many organisms, such as the cuticle, a waxy layer covering the leaves and stems of many land plants; and protective coverings on skin and fur of animals.
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Cholesterol and Steroids
Cholesterol and steroids: Most mention of these two in the news is usually negative. Cholesterol has many biological uses, such as its occurrence in the cell membranes, and its role in forming the sheath of some neurons.
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Proteins
Proteins are very important as control and structural elements. Control functions of proteins are carried out by enzymes and proteinaceous hormones.
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Enzymes
Enzymes are chemicals that act as organic catalysts (a catalyst is a chemical that promotes but is not changed by a chemical reaction).
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Structural Proteins
Structural proteins function in the cell membrane, muscle tissue, etc.
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Proteins
The building block of any protein is the amino acid, which has an amino end (NH2) and a carboxyl end (COOH). The R indicates the variable component of each amino acid.
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Basic Amino Acid
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Amino Acids
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Evolutionary Significance
All living things use various combinations of the same twenty amino acids. A very powerful bit of evidence for the phylogenetic connection of all living things.
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Peptide Bond
Amino acids are linked together by joining the amino end of one molecule to the carboxyl end of another. Removal of water allows formation of a type of covalent bond known as a peptide bond.
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Primary Structure
Amino acids are linked together into a polypeptide, the primary structure is the sequence of amino acids in a polypeptide.
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Secondary Structure
The secondary structure is the tendency of the polypeptide to coil or pleat due to H-bonding between R-groups.
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Tertiary Structure
The tertiary structure is controlled by bonding (or in some cases repulsion) between R-groups.The protein tends to fold upon itself.
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Quaternary Structure
Many proteins, such as hemoglobin, are formed from one or more polypeptides. Such structure is termed quaternary structure.
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Nucleic Acids
Nucleic acids are polymers composed of units known as nucleotides. The main functions of nucleotides are information storage (DNA), protein synthesis (RNA), and energy transfers (ATP and NAD).
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Nucleic Acids Cont’d
Nucleotides consist of a sugar, a nitrogenous base, and a phosphate. The sugars are either ribose or deoxyribose. There are five nitrogenous bases. Purines
(Adenine and Guanine) are double-ring structures, while pyrimidines (Cytosine, Thymine and Uracil) are single-ringed.
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DNA
Deoxyribonucleic acid (better known as DNA) is the physical carrier of inheritance for 99% of living organisms. The bases in DNA are C, G, A and T.
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RNA
RNA functions in protein synthesis. There are three types of RNA, each is involved in
protein synthesis. Messenger RNA (mRNA) is the blueprint for
construction of a protein. Ribosomal RNA (rRNA) is the construction site
where the protein is made. Transfer RNA (tRNA) is the truck delivering the
proper amino acid to the site at the right time.
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