Midterm
Biochemistry Midterm Quiz
Test your knowledge of biochemistry concepts with our engaging midterm quiz! Dive into crucial topics such as enzyme kinetics, hemoglobin fun
Each question is multiple-choice, challenging you to apply your understanding:
- Assess your grasp on enzyme activity and regulation.
- Evaluate factors affecting oxygen binding to hemoglobin.
- Explore metabolic processes and their integration.
In enzyme kinetics Km implies:
The substrate concentration that gives half Vmax
The dissociation constant for the enzyme substrate complex
Concentration of enzyme
2,3-bisphosphoglycerate in low concentrations, combine with hemoglobin, causes:
Displacement of the oxyhemoglobin dissociates curve to the right
Displacement of the oxyhemoglobin dissociates curve to the left
No change in oxyhemoglobin dissociates curve
Which of the following statements about hemoglobin is correct?
2,3-bisphosphoglycerate (BPG) increases the infinity of hemoglobin for oxygen
Deaoxygenated hemoglobin has a higher binding affinity for protons than has oxyhemoglobin
Hemoglobin has a higher affinity for oxygen than does myoglobin
Which of the following statements about the Bohr effect is true?
Lowering the pH shifts the oxygen dissociation curve of hemoglobin to the right (lower affinity)
The affinity of hemoglobin for o2 is improved by high concentration of Co2
In the lungs, the presence of higher concentration of o2 promotes the binding of CO2 and H+
Myoglobin is particularly abundant in
Nerves
Muscles
Blood cells
The affinity of hemoglobin for oxygen diminishes as which of the following
Ph
Co2
Temperature
The glycolysis is regulated by:
Hexokinase
Phosphofructokinase
Pyruvate kinase
All of the above
Glucongenesis is:
The formation of glycogen
Breakdown of glucose to pyruvate
Breakdown of glycogen to glucose
Synthesis of glucose from non-carbohydrate precursors
Which of the following substances CANNOT be converted to glucose:
Lactate
Glycerol
Acctoacctate
Aspartate
Which of the following is not a stage of acrobic respiration:
Glycolysis
Pyruvate oxidation
Electron transport chain
In electron transport, electrons ultimately pass to:
ADP
ATP synthase
Oxygen
None of these
The complete oxidation of glucose yields usable energy in the form of:
FADH2
ATP
Enzyme A
In what form does the product of glycolysis … the TCA cycle:
Acetyl CoA
NADH
Glucose
Hexokinase activity in glycolysis is inhibited by:
Glucose-6-phosphate
Fructose-6-phosphate
Fructose-1,6-biphosphate
A 57 year old …….
Biotin
Niacin
Pydrixine
Riboslavin
Thiaminine
A 7 year old girl …..
Free fatty acid breakdown
Gluconeogenesis
Gylocogenesis
Protein breakdown
Triglyceride breakdown
Circle all statements that are true:
Fatty acids cannot be used by RBC’s
Excess of carbohydrate and protein obtained through diet cannot be converted to fatty acids
Creatinine shuffles fatty acids into the mitochondrial matrix
Low calorie and high fat diet ….. Fatty acid ….
Which of the following statements about fatty acids is correct:
Fatty acids are used as fuel molecules by all cells in human body
Fatty acids are oxidized to acetyl CoA
Fatty acids are converted to glucose in the liver
Which of the following best explains why statin therapy is effective for individuals with hypercholesterolemia:
Statins inhibit HMG-CoA reductase, a key regulator of cholesterol synthesis
Statins inhibit HMG-CoA synthase, a key step for synthesis of mevalonate that inhibits fatty acid synthesis
Ketosis is partly ….. to
Fatty acids
Cholesterol
Pyruvic acid
Which of the following statements regarding TCA cycle is true?
It is an anaerobic process
It occurs in cytosol
It contains no intermediates for gluconeogenisis
It is ampbibolic in nature
Cholesterol is transported from liver to extrahepatic tissues by:
Chylomicrons
VLDL
HDL
LDL
Which of the following metabolite integrates glucose and fatty acids metabolism:
Acetyl CoA
Pyruvate
Lactate
The acetyl CoA formed on B-oxidation of all long chain fatty acids is….
CO2 and water
Cholesterol
Fatty acids
Ketone bodies
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