MICR 3033 Exam 1 Test Questions with Answers
Hemoglobin requires which small non-protein molecule to capture oxygen? - Answer-heme.
Enzymes that add or remove a phosphate group are respectively named? - Answer-kinase and phosphatase.
Which of the statements about binding and active sites ar...
MICR 3033 Exam 1 Test Questions
with Answers
Hemoglobin requires which small non-protein molecule to capture oxygen? - Answer-
heme.
Enzymes that add or remove a phosphate group are respectively named? - Answer-
kinase and phosphatase.
Which of the statements about binding and active sites are TRUE? - Answer-a binding
site recognizes the substrate and the active site catalyzes the reaction.
Endoglucanases and cellobiohydrolases have the same catalytic center but have a
variant configuration of the binding site. Identify, which of the following is TRUE? -
Answer-Because the catalytic site is identical but the binding site different both enzymes
can interact with the substrate in different ways thus producing different catalytic
products.
Two molecules are similar but not identical in structure and affect enzyme activity
differently. Identify the statements that are NOT TRUE?
A
if both molecules are catalyzed by the same enzyme at different Vmax and Km they are
both substrates.
B
if one molecule is catalyzed and the other not but interferes with Vmax and Km the
second molecule is an inhibitor.
C
the substrate that has the lowest Km is likely to have a better fit with the binding site of
the enzyme.
D
the substrate that has a higher Vmax must have a lower Km. - Answer-D
the substrate that has a higher Vmax must have a lower Km.
Protein kinases phosphorylate target enzymes and as a result enzymes become
activated or inactivated. Which of the following statement is NOT TRUE?
A
phosphorylated enzymes may behave like competitive inhibitors.
B
the presence of a phosphate group may act as a non-competitive inhibitor/activator. No
change in Km but significant change in Vmax.
C
the presence of a phosphate group may induce a conformational change that modifies
the affinity and catalytic ability of a target enzyme.
, D
the presence of a phosphate group tags the enzyme allowing interactions with other
enzymes. - Answer-D
the presence of a phosphate group tags the enzyme allowing interactions with other
enzymes.
Which characteristic of a phospholipid contributes to the fluidity of the membrane? -
Answer-double bonds in the fatty acid tail
Which transport mechanism can bring whole cells into a cell? - Answer-phagocytosis.
What happens to the membrane of a vesicle after exocytosis? - Answer-It fuses with
and becomes part of the plasma membrane.
Thinking on the molecules Na+, O2, H2O, K+ and CO2, order them based on their
ability to permeate the membrane - from very fast to very slow. - Answer-fast - O2 -
CO2 -H2O -K+ -Na+ -slow
Phospholipids make a fluid liquid, meaning that molecules move within the membrane
structure without the input of energy. Which of the following phospholipid movements
require the input of energy? - Answer-phospholipid flipping (movement from one layer to
another).
What configures a transmembrane domain? - Answer-a stretch of amino acids
intercalated by non-polar and polar amino acids where all non-polar amino acids face
the membrane and polar amino acids produce a hydrophilic lumen.
Which of the following is all ACTIVE transport - Answer-ATP and light driven pumps as
well as coupled transport.
Which subatomic particle is displaced when two or more atoms combine make a
molecule? - Answer-Electrons
What type of bond is formed when atoms share electrons? - Answer-Covalent
What determines the number of covalent bonds an atom can create? - Answer-the
excess or shortage of electrons in its outermost electron shell.
Oxygen with 6 electrons in the outer electron shell (that needs 8 to be complete), can
make how many covalent bonds? - Answer-2
Which of the following bonds are nonpolar? - Answer-oxygen and oxygen (O-O).
In water, hydrogen bonds form between - Answer-oxygen and hydrogen atoms.
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