biology : class12 Streptokinase Production : Food Processing, Industrial Production, Sewage Treatment, Energy Production : Microbes in Human Welfare MCQ Questions and Answers
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Streptokinase Production
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MCQ Questions
1. Which microorganism is classically associated with the production of streptokinase used as a clot-buster?
A.
Streptococcus
B.
Lactobacillus
C.
Saccharomyces
D.
Aspergillus
Correct Answer:
Streptococcus
Explanation:
Streptokinase is produced by Streptococcus and is used medically to dissolve blood clots.
2. The therapeutic value of streptokinase is primarily based on its ability to promote the conversion of which inactive plasma protein into an active fibrinolytic enzyme?
A.
Fibrinogen into thrombin
B.
Plasminogen into plasmin
C.
Prothrombin into fibrin
D.
Hemoglobin into heme
Correct Answer:
Plasminogen into plasmin
Explanation:
Streptokinase activates plasminogen to form plasmin, which degrades fibrin in blood clots.
3. In the context of microbial products, streptokinase is best classified as which type of product?
A.
A microbial biofuel
B.
A therapeutic protein
C.
A fermented food preservative
D.
A sewage-treatment flocculant
Correct Answer:
A therapeutic protein
Explanation:
Streptokinase is a protein produced by Streptococcus and employed therapeutically as a clot-dissolving agent.
4. A genetically engineered production strain is developed to manufacture streptokinase. Which property must be retained for the product to remain clinically useful?
A.
Ability to ferment lactose into lactic acid
B.
Ability to activate plasminogen
C.
Ability to produce methane anaerobically
D.
Ability to hydrolyse cellulose into glucose
Correct Answer:
Ability to activate plasminogen
Explanation:
The medical action of streptokinase depends on its capacity to activate plasminogen, initiating fibrin clot breakdown.
5. Why is streptokinase considered an important example of microbial production in human welfare?
A.
It converts organic waste into biogas
B.
It improves the leavening of bread
C.
It provides a microbial product for dissolving blood clots
D.
It increases the alcohol content of fermented beverages
Correct Answer:
It provides a microbial product for dissolving blood clots
Explanation:
Streptokinase is a microbial product used in medicine to help dissolve blood clots, including those associated with myocardial infarction.
6. Which sequence most accurately represents the functional basis of streptokinase therapy?
A.
Streptokinase activates plasminogen, and plasmin degrades fibrin
B.
Streptokinase converts fibrin into fibrinogen, and thrombin is inhibited
C.
Streptokinase activates hemoglobin, and oxygen dissolves the clot
D.
Streptokinase converts glucose into ethanol, and ethanol degrades fibrin
Correct Answer:
Streptokinase activates plasminogen, and plasmin degrades fibrin
Explanation:
Streptokinase initiates fibrinolysis by activating plasminogen; the resulting plasmin breaks down fibrin strands in clots.
7. If a microbial culture produces a protein that has no plasminogen-activating activity, which conclusion is most appropriate regarding its identification as functional streptokinase?
A.
It is functional streptokinase because all microbial proteins dissolve clots
B.
It cannot be confirmed as therapeutically functional streptokinase
C.
It must be penicillin because it is produced by a microbe
D.
It is automatically a sewage-treatment enzyme
Correct Answer:
It cannot be confirmed as therapeutically functional streptokinase
Explanation:
Functional streptokinase must retain plasminogen-activating activity, which is essential for its clot-dissolving effect.
8. Which clinical condition is most directly associated with the use of streptokinase as a clot-busting agent?
A.
Myocardial infarction
B.
Vitamin A deficiency
C.
Lactose intolerance
D.
Iron-deficiency anaemia
Correct Answer:
Myocardial infarction
Explanation:
Streptokinase can be used to dissolve obstructive blood clots in conditions such as myocardial infarction.
9. A student states that streptokinase directly digests fibrin without involving any blood protein. Which correction is scientifically appropriate?
A.
It acts by activating plasminogen, whose product carries out fibrin degradation
B.
It acts by converting fibrin into glucose during fermentation
C.
It acts by producing oxygen that mechanically breaks the clot
D.
It acts by converting red blood cells into antibodies
Correct Answer:
It acts by activating plasminogen, whose product carries out fibrin degradation
Explanation:
Streptokinase functions through plasminogen activation; plasmin generated from plasminogen is responsible for degrading fibrin.
10. Which combination correctly matches the microbial source, product, and application of streptokinase?
A.
Streptococcus — streptokinase — dissolution of blood clots
B.
Lactobacillus — insulin — treatment of blood clots
C.
Saccharomyces — penicillin — treatment of myocardial infarction
D.
Aspergillus — ethanol — activation of plasminogen
Correct Answer:
Streptococcus — streptokinase — dissolution of blood clots
Explanation:
Streptococcus produces streptokinase, a therapeutic protein whose clot-dissolving action results from activation of plasminogen.
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