Macromolecules
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Transcript of Macromolecules
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MACROMOLECULES
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CARBON Carbon is a component of almost all
biological macromolecules. Carbon has four valence electrons and
thus, four spaces to create covalent bonds8 (for the octet rule)-4 valence electrons=4
spaces for bonding. Organic compounds are compounds
containing carbon.
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MACROMOLECULES Carbon atoms are joined together to
form macromolecules. Macromolecules: large organic
molecules formed by joining smaller organic molecules together
Also called polymers: molecules made from repeating units of monomers linked together. Monomers are small subunits of
macromolecules. Think of them as the building blocks of polymers.
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CARBOHYDRATES Elements present: Carbon,
Hydrogen, Oxygen Ratio of elements: 1 oxygen and 2
hydrogen for ever 1 carbon. Used for: energy storage and
structural support Monomer: Monosaccharaides,
sugars 3-7 (CH2O) molecules in a chain.Ex. Glucose
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CARBOHYDRATES CONT. Two monosaccharides joined together
form a disaccharide, such as sucrose. Longer carbohydrate molecules are
called polysaccharides, like glycogen.
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LIPIDS A group of chemicals that includes fats,
oils, waxes, phospholipids, steroids, and sterols (steroid + alcohols).
Elements present: Carbon, oxygen, hydrogen and phosphorus
Monomer: no real monomer per se, as there are no repeating units. However lipids are made up of fatty acids and glycerols.
Purpose: Store large amounts of energy long term; form boundaries around cells
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LIPID CHEMICAL STRUCTURE Fatty acids are non-polar
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LIPIDS Saturated Fats
Lipids with only single bonds between carbon atoms. No more hydrogen can bond to the tail
Unsaturated FatsLipids with at least one carbon to carbon
double bond. Can accommodate more hydrogen.
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PROTEINS Elements present: carbon, hydrogen,
oxygen, nitrogen, and sulfur Uses: structural components of
animals, control molecules (enzymes), transport and messenger molecules
Monomer: amino acids
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PROTEIN FUNCTION Function:
many, many functions hormones
signals from one body system to anotherinsulin
movementmuscle
immune systemprotect against germs
enzymeshelp chemical reactions
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AMINO ACIDS Amino acids: protein monomer
Consists of: carboxyl group, amine/amino group, central carbon and a variable side chain (sometimes represented as R)
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AMINO ACIDS Amino acids chain together into
polymers.Some are hydrophobicSome are hydrophilic
amino acid amino acid amino acid amino acid amino acid
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EXAMPLES
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SHAPE MATTERS Hydrophilic proteins are attracted to
water in the cell and fold out, hydrophobic molecules fold away from water
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SHAPE CONT. As a result of this and also hydrogen
bonds between each other, proteins fold.
Shape of a protein determines its job
pepsinhemoglobin
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NUCLEIC ACIDS Large complex molecules that contain
hereditary or inherited information. Elements present: Carbon, oxygen,
hydrogen, nitrogen and phosphorus Uses: Carry hereditary information;
used to make proteins Monomer: nucleotides
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NUCLEIC ACIDS CONT. Nucleotides
Adenine, Guanine, Cytosine, and Thymine in DNA In RNA, Thymine is replaced by Uracil
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DNA V. RNA DNA: double helix RNA: Single strand
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DEHYDRATION SYNTHESIS How bonds are formed between
monomers. Results in two bonded monomers and a
molecule of water.
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HYDROLYSIS The opposite of dehydration synthesis. Happens when a molecule of water
breaks the bond between two monomers.
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