Lesson Overview Lesson Overview Carbon Compounds Chapter 2.3 Carbon Compounds.
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Carbon Compounds and Cells
All living organisms are composed of cells, from just one to many trillions
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How are the ingredients for life put
together?
• Most molecules that make up living things are
very large and complex.
• Now, let’s learn about their structures and
function.
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Carbon Compounds
• Life, as we know it, is
carbon-based.
• This means that most
of the compounds you
are made of contain
the element “carbon”.
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• A carbon atom can form
chemical bonds with other
carbon atoms in long chains
or rings
• Some carbon compounds
contain several thousand
carbon atoms
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• Carbon compounds are
not only found in living
things.
• Plastic, rubber, and
gasoline are carbon
compounds.
• In fact, there are over 12
million known carbon
compounds!!
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The carbon compounds in living
things are classified into four groups
of MACROMOLECULES:
• Carbohydrates
• Lipids
• Proteins
• Nucleic acids
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Macromolecules in YOU!
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Macromolecules in your food
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Check Your Understanding
What element is found in all living organisms?All living organisms contain carbon.
What are the 4 carbon compounds, or macromolecules?The 4 macromolecules are carbohydrates, lipids, proteins, and nucleic acids.
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Carbohydrates
Short-term energy-rich compounds made from carbon, hydrogen, and
oxygen atoms.
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Plants and animals use carbohydrates
• Cells use carbohydrates as a short-term energy
source.
• Plants contain cellulose, a carbohydrate, which
gives them a rigid structure.
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Carbohydrates are classified as sugars
and starches.
• Sugars are simple molecules which are smaller
than starches.
• This group is called monosaccharides.
• Starch molecules are complex and very large.
• They consist of many sugar molecules
combined.
• This group is called polysaccharides.
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Monosaccharides are classified as
simple sugars.
• Mono = one or simple
• Saccharides = sugars
• One type of sugar you are familiar with is
glucose, from photosynthesis.
• You probably also heard of sucrose and fructose.
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Glucose
• A simple sugar that
plants make through
photosynthesis.
• A sugar that is made of
these atoms:
• 6-carbon,
• 12-hydrogen, and
• 6-oxygen
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Sucrose
• The type of sugar you
use for everyday use.
• A sugar that is made of
these atoms:
• 12-carbon,
• 22-hydrogen, and
• 11-oxygen
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Fructose
• The sweetest of all
sugars, found in honey,
flowers, and tree fruits.
• A sugar that has the same
formula as glucose, but
structured differently:
• 6-carbon,
• 12-hydrogen, and
• 6-oxygen
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Polysaccharides are classified as starch
and glycogen.
• Poly = many, or complex
• Saccharides = sugars
• Starches are made exclusively by plants.
• Glycogen are made by animals.
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• Rice, potatoes, and
wheat are plant
starches.
• Many of the world’s
staple foods contain
starch.
Plant cells store energy as starch.
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The outer shells,
or exoskeletons,
of insects and
crustaceans are
called chitin, is
an example of a
polysaccharide.
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Check Your Understanding
How do plants and animals use carbohydrates? Plants and animals use carbohydrates as a short-term energy source. Plants
also use carbohydrates to give them a rigid structure.
What do plants store energy as?Plants store energy as starch.
What are 2 types of carbohydrates and an example of where they are
each found?Monosaccharides are simple sugars found in fruits.
Polysaccharides are complex sugars, like starches and glycogen, found in starchy foods and the exoskeletons of insects and crustaceans.
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Lipids
Long-term energy-rich compounds made from carbon, hydrogen, and
oxygen atoms
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• Lipids are organic compounds
found in every type of plant
and animal cells.
• They are insoluble in water,
which means that water
cannot dissolve them.
Lipids include fats, oils, and waxes
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Lipids have many important functions,
such as insulation and energy storage
• Lipids stored in animals are fats, and lipids in
plants are oils.
• Animals that hibernate live off of fat stored in
their cells.
Can you think of examples of lipids in plants
or animals?
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Examples of lipids in plants and animals
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• Saturated fats are
considered the “bad”
lipids.
• Unsaturated fats are
considered the “good”
lipids.
There are 2 types of lipids: saturated
and unsaturated.
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• These fats are solid at
room temperature.
• Usually contain high
cholesterol.
• These are fats you
should eat less of.
Saturated lipids, or fats, are made from
animal fats and animal products.
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• These fats are not
solid at room
temperature.
• These are fats
you should be
eating more of.
Unsaturated lipids, or fats, are usually
made from plant oils and plant products.
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Check Your Understanding
How do plants and animals use lipids?Lipids are used for storing energy for long periods of time.
What is a special characteristic of lipids in water?
Lipids are insoluble in water.
What are the 2 types of lipids, and give an example of where to find them.
Saturated lipids are found in animal fats and products, such as meats and
cheeses.
Unsaturated lipids are usually found in plants, such as olive oil and nuts.
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Proteins
Very large molecules made of carbon, hydrogen, oxygen, nitrogen, and
sometimes sulfur.
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Proteins are found
in many animal
parts like hair,
fingernails,
muscle, and skin.
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Protein is also
in your blood’s
hemoglobin,
which carries
oxygen to your
cells.
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Foods high in
protein include
meats, eggs,
fish, nuts,
dairy products,
and beans.
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Enzymes are proteins
• An enzyme is a type of protein that cells use to
speed up chemical reactions.
• Digestive enzymes are made by the pancreas.
• These enzymes help break down the foods you eat
into smaller molecules that can be absorbed by
your cells.
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• Your cells combine
different amino acids in
various ways to make
different proteins.
• There are 20 amino acids
used by cells to make
proteins
Proteins are made of amino acids
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Check Your Understanding
Where in your body can proteins be found?Proteins can be found in hair, nails, skin, hemoglobin, and muscles.
What makes proteins?
Amino acids make proteins.
What is an enzyme?
An enzyme is a type of protein that cells use to speed up chemical reactions.
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Nucleic Acids
Long, repeating chains of nucleotides that are made from carbon,
hydrogen, oxygen, nitrogen, and phosphorus
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Each nucleotide contains
• a sugar molecule
• a phosphate
molecule
• a base molecule
Nucleic acids are compounds made of
long repeating chains called nucleotides.
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• DNA contains the
information cells need to
make all of their proteins,
like a storehouse for all of
your genetic information
• RNA translates the
messages for protein
building.
DNA and RNA are nucleic acids
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Check Your Understanding
What are nucleic acids made of?Nucleic acids are made of long repeating chains called nucleotides.
What are the 3 components of a nucleotide?
Each nucleotide contains a sugar molecule, a phosphate molecule, and a base
molecule.
Where in our bodies can we find nucleic acids?
DNA and RNA are nucleic acids, and they are responsible for making and
translating proteins.
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Check Your Understanding
Write a 5-sentence summary about each of the macromolecules and
what they do for living organisms.