BIS 102; MIDTERM #2 REVIEW
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) A GRADE
1st law of thermodynamics - correct answer- total energy
of system and environment are constant
therefore change in energy depends only on initial and final
states
3 classes of protein - correct answer- 1. Fibrous proteins-
fibrous and hydrophobic
2.Globular proteins-spherical and hydrophilic
3. Membrane proteins-called 7 pass transmembrane or Gprotein
receptors that are in the cell membrane
A change in Km with no corresponding change in Vmax usually
means: - correct answer- Competitive inhibition
A change in Vmax without a corresponding change in Km usually
indicates: - correct answer- Pure-Noncompetitive
inhibition
, A uniform change in Km and Vmax usually indicates: - correct
answer- Uncompetitive inhibition
Allosteric Enzymes example - correct answer- myoglobin
can only bind to one oxygen while hemoglobin can carry
multiple(4) and increases affinity with each subsequent oxygen
binded.
An unequal change in Km and Vmax usually indicates: -
correct answer- Mixed-noncompetitive inhibition
Anti-parallel Beta-Sheets - correct answer- All
hydrophobic groups on one side
Peptide bonds are each 3.47A or 0.347nm
Beta Keratin - correct answer- Gly,Ala,Gly,Ser.... repeated
often so high Gly content
fibrous protein
Beta Turns or tight turns - correct answer- carbonyl
groups bind to amides that are 3 positions away
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) A GRADE
1st law of thermodynamics - correct answer- total energy
of system and environment are constant
therefore change in energy depends only on initial and final
states
3 classes of protein - correct answer- 1. Fibrous proteins-
fibrous and hydrophobic
2.Globular proteins-spherical and hydrophilic
3. Membrane proteins-called 7 pass transmembrane or Gprotein
receptors that are in the cell membrane
A change in Km with no corresponding change in Vmax usually
means: - correct answer- Competitive inhibition
A change in Vmax without a corresponding change in Km usually
indicates: - correct answer- Pure-Noncompetitive
inhibition
, A uniform change in Km and Vmax usually indicates: - correct
answer- Uncompetitive inhibition
Allosteric Enzymes example - correct answer- myoglobin
can only bind to one oxygen while hemoglobin can carry
multiple(4) and increases affinity with each subsequent oxygen
binded.
An unequal change in Km and Vmax usually indicates: -
correct answer- Mixed-noncompetitive inhibition
Anti-parallel Beta-Sheets - correct answer- All
hydrophobic groups on one side
Peptide bonds are each 3.47A or 0.347nm
Beta Keratin - correct answer- Gly,Ala,Gly,Ser.... repeated
often so high Gly content
fibrous protein
Beta Turns or tight turns - correct answer- carbonyl
groups bind to amides that are 3 positions away
