Construct and revise an explanation based on evidence for how
carbon, hydrogen, and oxygen from sugar molecules may combine with
other elements to form amino acids and/or other large carbon-based
molecules. Plan and conduct an investigation to provide evidence
how feedback mechanisms maintain homeostasis.
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BIG biological molecules Made of smaller parts Monomers
Carbon-based (organic) Carbohydrates Nucleic acids Proteins
Lipids
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Monomer? Glycerol head Fatty acid tail Used for: Long term
energy storage Insulation Major component of membranes Signaling
molecules and hormones Examples: Fats, oils, waxes Found in: All
the good tasting foods
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All cells have cell membranes Some cells (eukaryotes) have
membranes surrounding organelles Example: nucleus All cells need to
import and export molecules in order to function properly and
maintain homeostasis
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1. Regulate passage of nutrients, wastes, gases, and water into
and out of cell 1.Selectively permeable picky about what passes 2.
Separate cell from the environment 3. Allow cells to communicate
with other cells via receptors on the surface
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Cell membranes are fluid mosaics of lipids and proteins
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Made of phospholipid bilayer Phosphate (hydrophilic) head Lipid
(hydrophobic) tail Phospholipid bilayer
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Protein channels Allow large molecules to pass through Protein
channels
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Receptor Protein Receives messages from outside the cell Cell
communication is key for homeostasis! Receptor Protein
