Module 2 - Anatomy Flashcards

1
Q

ionic bond

A

attraction between oppositely charged ions: cation (+) and anion (-)

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2
Q

covalent

A

the sharing of a pair of valence electrons by 2 atoms
1) non-polar: electrons equally shared
2) polar: electrons shared unequally

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3
Q

hydrogen bonds

A

attraction between partially positively charged hydrogen atoms and partially negatively charged electronegative atoms

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4
Q

macromolecules

A

1) carbohydrates
2) proteins
3) lipids
4) nucleic acids

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5
Q

Macromolecules

A
  • they are all organic
  • mostly CHO atoms
  • High carbon content
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6
Q

why carbon?

A
  • common
  • 4 valence electrons
  • bonds to other carbons to form complex backbones
  • forms covalent bonds
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7
Q

reactions to make and break polymers

A

1) dehydration synthesis/condensation
2) hydrolysis

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8
Q

dehydration synthesis/condensation

A

1+1=2
product: water + polymer

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9
Q

hydrolysis

A

2=1+1
reactant: water + polymer

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10
Q

carbohydrates: function

A
  • 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
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11
Q

Phospholipids

A

Amphipathic
- hydrophilic heads
- hydrophobic tail

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12
Q

eicosanoids

A
  • function primarily as chemical signals between cells (cellular communication)
  • prostaglandins: inflammation, pain, blood clotting
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13
Q

steroids

A
  • 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
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14
Q

amino acid

A

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

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15
Q

dipeptide

A

proteins are made from amino acids linked by peptide bonds

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16
Q

polypeptide

A

peptides are names for the number of amino acids they contain:
- dipeptides (2 amino acids)
- tripeptides (3 amino acids)
- oligopeptides (btwn 3 and 15 amino acids)
- polypeptides btwn 15 and 50 amino acids)
- proteins (more than 50 amino acids)

17
Q

primary structure

A
  • the unique linear sequence of amino acid that determines all other levels of structure
  • results from the formation of peptide bonds between amino acids
18
Q

Secondary structure

A
  • the two dimensional shape: the coiling (alpha helix) or folding (beta-pleated sheet) of the polypeptide
  • results from the formation of hydrogen bonds between atoms of the polypeptide backbone
19
Q

Tertiary structure

A
  • the three-dimensional shape
  • results from interactions between the R groups of the various amino acids (disulfide bridges)
20
Q

Quaternary structure

A
  • the association of 2 or more polypeptide chains
  • results from ionic bonds and hydrophobic interactions
21
Q

enzymes

A
  • proteins
  • biological catalysts
  • lower activation energy of reactions
  • increase the rate of a reaction without being consumed by the reaction (neither reactants nor products)
  • highly specific
22
Q

enzyme proteins

A

serve as metabolic catalysts and regulate chemicals

23
Q

structural proteins

A

provide associations between body parts

24
Q

contractile proteins

A

are found within muscles

25
Q

defensive proteins

A

include antibodies of the immune system

26
Q

signal proteins

A

best exemplified by hormones and other chemical messengers

27
Q

receptor proteins

A

transmit signals into cells

28
Q

transport proteins

A

carry oxygen

29
Q

storage proteins

A

serve as a source of amino acids for developing embryos

30
Q

nucleotides

A

1) five-carbon sugar
2) phosphate group
3) nitrogenous base

31
Q

DNA

A

Adenine (A)
Thymine (T)
Cytosine (C)
Guanine (G)

32
Q

RNA

A

Adenine (A)
Cytosine (C)
Guanine (G)
Uracil (U)

33
Q

Adenosine Triphosphate

A

Consists of
- the nitrogenous base adenine
- the five-carbon sugar ribose
- three phosphate groups
Holds energy in covalent bonds
- second and third phosphate groups have high energy bonds
- most energy transfers to and from ATP involve adding or removing the third phosphate group
The body’s most important energy transfer molecule
- stores energy gained from exergonic reactions
- releases it within seconds for physiological work

34
Q

ATP drives cellular work

A
  • by coupling exergonic and endergonic reactions
  • in the ATP cycle, energy released in an exergonic reaction, such as the breakdown of glucose, is used in an endergonic reaction to generate ATP
35
Q

ATP powers cellular work

A

1) chemical
2) mechanical
3) transport