atoms elements compounds in biological compounds…often form covalent bonds proportions in...
TRANSCRIPT
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IB Topic 3The Chemistry of Life
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3.1Chemical Elements
& Water
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3.1.1 State that the most frequently occurring chemical elements in living things are carbon, hydrogen, oxygen and nitrogen.
Atoms Elements Compounds In Biological Compounds…often
form covalent bonds Proportions in Living Organisms C 19% H 10% O 65% N 3%
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3.1.2 State that a variety of other elements are needed by living organisms, including...3.1.3 State one role for each of the elements...
SULFUR› In some amino acids (disulfide
bridges)› Proteins › Chemoautotrophs use it as energy
source
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3.1.2 State that a variety of other elements are needed by living organisms, including ...3.1.3 State one role for each of the elements...
CALCIUM› Cell structure, movement
Cell walls, cell membranes, muscle contractions
› Support of bones (lack osteoporosis)› Neurotransmitter release for nervous
system messages
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3.1.2 State that a variety of other elements are needed by living organisms, including ...3.1.3 State one role for each of the elements...
PHOSPHORUS› ATP› DNA
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3.1.2 State that a variety of other elements are needed by living organisms, including ...3.1.3 State one role for each of the elements...
IRON› Some chemoautotrophs—
source of energy› Helps w/formation of
chlorophyll Fe deficient plants can’t
photosynthesize properly› Component of hemoglobin
(RBCs) O2 transport
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3.1.2 State that a variety of other elements are needed by living organisms, including ...3.1.3 State one role for each of the elements...
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3.1.2 State that a variety of other elements are needed by living organisms, including ...3.1.3 State one role for each of the elements...
SODIUM› Some plants: helps bind
CO2 for photosynthesis› Action potential in neurons
Nerve impulses Na-K pumps
› Glucose co-transport across membranes
› Prokaryotes—movement of flagellum
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3.1.4 Draw and label water molecules to show their polarity and hydrogen bond formation.
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3.1.5 Outline the thermal, cohesive, and solvent properties of water.
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3.1.5 Outline the thermal, cohesive, and solvent properties of water.
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3.1.6 Explain the relationship between the properties of water [thermal, cohesive, solvent] and its uses in living organisms as a coolant, medium for metabolic reactions, and transport medium.
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Comparison of air & water temp (24 hrs) from an Oak woodland during a temperate summer
temp vs. time of day water remains fairly stable
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