BCH 441 EXAM 2 QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED LATEST UPDATE
Factors that affect melting point of fatty acids
- More C atoms = higher MP
- Higher degree of unsaturation (more double bonds) = Lower MP
Functions of carbohydrates in cells
-Energy storage
-Structure
-Recognition
-Signaling
-Protein folding/stability
-Antifreeze
-Antibiotic
Bile acid function
steroids that aid in fat digestion and nutrient absorption
peripheral proteins
bound to the surface of the membrane
- Attached by myristoyl or palmitoyl lipid anchors
- Can be removed by changing ionic strength
Fatty acyl anchors link to the side chains of ________ and sometimes ______ or
_________ within peptide chains
, Cysteine! Sometimes Serine or threonine
Myristoylation occurs on N-terminal _____ residues
Glycine
Example of N-myristoyl anchored protein is the catalytic subunit of cAMP dependent
protein kinase
Prenyl lipid anchor occur on
Cycsteine residues in sequences CAAX where the A's are aliphatic amino acids and X
is any residue
facilitated diffusion
Movement of specific molecules across cell membranes through protein channels
Passive diffusion
Rate of transport is linearly dependent on the concentration of species, species move
across the membrane in the thermodynamically favored direction without the help of
specific transport system or molecule
Which amino acids are most likely to be found in the interior of a cation channel?
an anion channel?
Negatively charged sidechains are found in the interior of cation channels (aspartic or
glutamic acid)
Positively charged sidechains are found in the interior of anion channels (Histidine,
arginine, lysine)
Noncovalent interactions stabilize the higher levels of protein structures
- Van de waals
SOLUTIONS VERIFIED LATEST UPDATE
Factors that affect melting point of fatty acids
- More C atoms = higher MP
- Higher degree of unsaturation (more double bonds) = Lower MP
Functions of carbohydrates in cells
-Energy storage
-Structure
-Recognition
-Signaling
-Protein folding/stability
-Antifreeze
-Antibiotic
Bile acid function
steroids that aid in fat digestion and nutrient absorption
peripheral proteins
bound to the surface of the membrane
- Attached by myristoyl or palmitoyl lipid anchors
- Can be removed by changing ionic strength
Fatty acyl anchors link to the side chains of ________ and sometimes ______ or
_________ within peptide chains
, Cysteine! Sometimes Serine or threonine
Myristoylation occurs on N-terminal _____ residues
Glycine
Example of N-myristoyl anchored protein is the catalytic subunit of cAMP dependent
protein kinase
Prenyl lipid anchor occur on
Cycsteine residues in sequences CAAX where the A's are aliphatic amino acids and X
is any residue
facilitated diffusion
Movement of specific molecules across cell membranes through protein channels
Passive diffusion
Rate of transport is linearly dependent on the concentration of species, species move
across the membrane in the thermodynamically favored direction without the help of
specific transport system or molecule
Which amino acids are most likely to be found in the interior of a cation channel?
an anion channel?
Negatively charged sidechains are found in the interior of cation channels (aspartic or
glutamic acid)
Positively charged sidechains are found in the interior of anion channels (Histidine,
arginine, lysine)
Noncovalent interactions stabilize the higher levels of protein structures
- Van de waals
