Module 2 - Anatomy Flashcards
ionic bond
attraction between oppositely charged ions: cation (+) and anion (-)
covalent
the sharing of a pair of valence electrons by 2 atoms
1) non-polar: electrons equally shared
2) polar: electrons shared unequally
hydrogen bonds
attraction between partially positively charged hydrogen atoms and partially negatively charged electronegative atoms
macromolecules
1) carbohydrates
2) proteins
3) lipids
4) nucleic acids
Macromolecules
- they are all organic
- mostly CHO atoms
- High carbon content
why carbon?
- common
- 4 valence electrons
- bonds to other carbons to form complex backbones
- forms covalent bonds
reactions to make and break polymers
1) dehydration synthesis/condensation
2) hydrolysis
dehydration synthesis/condensation
1+1=2
product: water + polymer
hydrolysis
2=1+1
reactant: water + polymer
carbohydrates: function
- carbohydrates are a quickly mobilized source of energy
- all digested carbohydrates converted to glucose
- oxidized to make ATP
- carbohydrates are often conjugated with:
1) lipids -> glycolipids
2) proteins -> glycoproteins - proteoglycans are more carbohydrate than protein
1) gels that hold cells and tissues together; fill the umbilical cord and eye
2) joint lubrication: responsible for the rubbery texture of cartilage
Phospholipids
Amphipathic
- hydrophilic heads
- hydrophobic tail
eicosanoids
- function primarily as chemical signals between cells (cellular communication)
- prostaglandins: inflammation, pain, blood clotting
steroids
- lipids in which the carbon skeleton contains 4 fused rings
- cholesterol = 4 ring parent steroid
1) importance structural component of cellular membranes
2) starting material for making steroid hormones (communication): cortisol, testosterone, estrogen
amino acid
central carbon bonding with
1) an amino group
2) a carboxyl group
3) a hydrogen atom
4) a functional group R
classified as:
- hydrophilic
- hydrophobic
dipeptide
proteins are made from amino acids linked by peptide bonds