151 . The enzyme glucose – 6 –
phosphatase is absent in ____________
Answer : Muscle
152 . What are the two forms of
phosphorylase?
Answer
: Active phosphorylase ‘ a’ , Inactive
phosphorylase ‘ b ‘
153 . Which one activate the
inactive phosphorylase ‘ b ‘?
Answer : Phosphorylase kinase
enzyme in the presence of ATP
154 . What is the function of active
phosphorylase ‘ a’ in glycogenolysis?
Answer : Split glucose – 1 –
phosphate units from glycogen and raises the blood sugar level.
155 . Which enzyme convert ribulose – 5 – phosphate into xylulose – 5 –
phosphate?
Answer : Epimerase
156 . The enzyme phosphoribo
isomerase convert ribulose – 5 – phosphate into _________
Answer :Ribose – 5 – phosphate
157 . Name the enzyme which convert glucose – 6 –
phosphate into 6 – phosphogluconic acid?
Answer : Glucose – 6 – phosphate
dehydrogenase
158 . Which hormone decreases the
level of cAMP?
Answer : Insulin
159 .Name the hormones which
increases the level of cAMP.
Answer : Glucagon or epinephrine
160 . What are the two hormones
stimulate the activity of adenylcyclase in the liver?
Answer : Epinephrine and glucagon
161 . In fear, anger and
excitement blood sugar level increases. Explain this.
Answer : In violent emotions
like fear, anger and excitement leads to secretion of epinephrine. Which
stimulate the action of cAMP to accelerate glycogenolysis and increases blood
glucose level.
162 . What enzyme catalyse the
conversion of pyruvic acid into acetyl – CoA?
Answer : Pyruvate
dehydrogenase
163 . What is the link between
glycolysis and citric acid cycle?
Answer : Oxidation of pyruvic
acid to Acetyl -CoA ( Formation of
acetyl – CoA )
164 . What are the coenzymes are
essential for the conversion of pyruvic acid into acetyl – CoA?
Answer : TPP, lipoic acid,
coenzyme A, NAD, FAD and Mg++
165. Give the formation of active
acetaldehyde.
Answer : Active pyruvate loses CO2
to form active acetaldehyde
166 . What is the other name for
active acetaldehyde?
Answer : Enzyme – bound
hydroxyl ethyl – TPP.
167 . Give the formation of
acetylated lipoate.
Answer : The active acetaldehyde
condenses with the disulphide group of lipoate bound – enzyme system to form
the acetylated lipoate.
168 . Formation of Acetyl CoA from
acetylated lipoate takes place in the presence of ___________
Answer : Dihydro lipoyl
transacetylase
169 . What is the aerobic phase of
carbohydrate metabolism?
Answer : Citric acid cycle
170 . In which region 2 pyruvates
are produced from one glucose molecule in glycolysis?
Answer : Cytoplasm
171 . In which region pyruvates are oxidatively decarboxylated to 2 acetyl – CoA units?
Answer : Mitochondria
172 . How many molecules of CO2 are liberated in the conversion of one
pyruvate into 2 acetyl – CoA units?
Answer : Two molecules of CO2
173 . In which cell organelle
citric acid cycle mostly occur?
Answer : Citric acid cycle mostly
occur in mitochondria.
174 . What is the other name for
citric acid cycle?
Answer : Krebs cycle or TCA
cycle
175 . In which region all the
enzymes of citric acid cycle is present
?
Answer : Matrix of
mitochondria
0 comments:
Post a Comment