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Stevek113
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BIOLOGY
Immunology
MHC Class II Molecules
MHC Class II molecules orchestrate immune alerts that can tip the balance between defense and self-destruction
15 hours ago
0
Why is the selective expression of MHC Class II molecules on professional antigen-presenting cells crucial for immune system function?
It ensures that helper T cells are activated only when appropriate, preventing unnecessary or harmful immune responses.
It allows all body cells to present antigens and activate immune responses indiscriminately.
It prevents the immune system from recognizing any foreign antigens, avoiding autoimmune diseases entirely.
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Steeeve
Steeeve is an IT guru
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BIOLOGY
Immunology
White Blood Cells
The invisible war inside your bloodstream shapes every moment of your health
29 hours ago
0
Which of the following best explains the trade-off involved in white blood cell activity?
White blood cells only attack bacteria and have no role in viral infections.
An insufficient number of white blood cells increases infection risk, while excessive activity can cause harmful inflammation.
White blood cells are smaller than red blood cells and mainly transport oxygen.
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Steeeve
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HEALTH
Immunology
Vaccines
Vaccines train the immune system without causing the disease itself
29 hours ago
0
What is the primary mechanism by which vaccines protect against infectious diseases?
They introduce live, disease-causing microbes to build immunity.
They stimulate the immune system to recognize and destroy pathogens without causing illness.
They work by directly killing pathogens inside the body upon vaccination.
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Steeeve
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MEDICINE
Immunology
Allergic Rhinitis
Immune system's friendly fire causes the misery of hay fever every spring
4 days ago
0
What is the primary cause of symptoms in allergic rhinitis?
An overactive immune response to harmless airborne allergens
A bacterial infection in the nasal passages
A deficiency in nasal mucus production
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Stevek113
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BIOLOGY
Immunology
Immune System
The immune system’s memory lets it defeat repeat invaders with uncanny precision
4 days ago
0
Which feature of the immune system allows it to respond more effectively to a pathogen it has encountered before?
The adaptive immune system's ability to learn and remember specific pathogens
The innate immune system's broad, preconfigured responses
The immune system attacks all foreign substances indiscriminately without memory
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Steeeve
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BIOLOGY
Immunology
Immune System
The immune system's dual nature balances rapid defense with learned precision to protect health.
5 days ago
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What is the primary advantage of the adaptive immune system over the innate immune system?
It learns to recognize and respond more effectively to specific pathogens upon repeated exposure.
It provides a faster but less specific response to all pathogens.
It attacks all foreign substances without distinguishing between harmful and harmless ones.
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Steeeve
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MEDICINE
Immunology
Cowpox Vaccination
Early vaccine fears sparked fierce debates despite its lifesaving success
6 days ago
0
What was the main trade-off in using cowpox vaccination to prevent smallpox?
Using cowpox vaccination caused smallpox to become more severe
Cowpox vaccination was rejected because it had no effect on smallpox immunity
Accepting a mild cowpox infection to gain immunity against deadly smallpox
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Bonbo
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HEALTH
Immunology
Autoimmune Disease
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The immune system’s friendly fire can mimic over 100 distinct diseases across the body
6 days ago
Autoimmune diseases don’t arise from a simple malfunction but from a bewildering betrayal within the body’s own defense system. Contrary to the common belief that the immune system only fights external invaders, in autoimmune diseases,...
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Underground
Underground music and art
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HEALTH
Immunology
Autoimmune Disease
The immune system's friendly fire causes a hidden war inside the body
6 days ago
0
What is the primary cause of tissue damage in autoimmune diseases?
A viral infection directly destroys the tissues.
The immune system mistakenly attacks the body's own healthy cells.
Autoimmune diseases are caused by external toxins only.
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Bonbo
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BIOLOGY
Immunology
Macrophages
Macrophages toggle between warrior and healer roles to protect and repair the body
6 days ago
0
What critical function do macrophages perform that marks a turning point in the immune response?
Producing antibodies specific to pathogens
Directly killing infected cells without engulfment
Engulfing and digesting pathogens and cellular debris through phagocytosis
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Bonbo
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HEALTH
Immunology
Autoimmune Disease
The immune system’s own defense can turn into a hidden internal war against the body
7 days ago
0
What is the primary cause of autoimmune diseases?
The immune system fails to respond to foreign pathogens.
The adaptive immune system mistakenly attacks the body's own healthy tissues.
Autoimmune diseases are caused by external infections only.
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Physics_At_Sea
Physicist from London with special interest in Quantum Mechanics
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HEALTH
Immunology
Autoimmune Disease
Immune system's self-attack sparks over 80 chronic diseases worldwide
7 days ago
0
What is the primary cause of tissue damage in autoimmune diseases?
The immune system mistakenly attacks the body's own healthy cells.
External pathogens directly damage the tissues without immune involvement.
Autoimmune diseases result from a weakened immune system failing to respond.
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Steeeve
Steeeve is an IT guru
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HEALTH
Immunology
Allergic Reaction
Immune system’s mistaken identity can turn everyday substances into dangerous threats
7 days ago
0
What is the primary cause of allergic reactions in the body?
Allergic reactions are caused by infections from bacteria or viruses.
Allergic reactions occur only when the body is exposed to toxic chemicals.
The immune system mistakenly identifies harmless substances as threats.
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Physics_At_Sea
Physicist from London with special interest in Quantum Mechanics
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BIOLOGY
Immunology
Inflammatory Response
The body's inflammatory response can both heal wounds and fuel chronic diseases
8 days ago
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What is a key trade-off in the body's inflammatory response?
It always eliminates pathogens without any side effects
It protects against harm but can cause tissue damage if uncontrolled
It only occurs in response to infections, not physical injuries
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Bonbo
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SCIENCE
Immunology
Ilya Mechnikov
The clash between cellular and humoral immunity theories shaped modern medicine's understanding of disease defense
9 days ago
0
What was the main scientific conflict between Ilya Mechnikov and Paul Ehrlich regarding immunity?
Both scientists agreed that immunity was solely based on chemical reactions without cellular involvement.
Mechnikov believed immunity was caused by external environmental factors rather than internal body mechanisms.
Mechnikov emphasized cellular defense via phagocytes, while Ehrlich focused on antibodies in the blood.
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FordMotor
Ford makes good cars for great people. This is the page for our new F1 team.
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HEALTH
Immunology
Vaccines
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Vaccines train the immune system to fight invisible enemies without causing disease
9 days ago
Vaccines have saved millions of lives by turning our immune system into a vigilant guardian against deadly diseases, but their true power lies in the clever way they mimic threats without causing harm. Instead of...
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Steeeve
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HEALTH
Immunology
Vaccines
The discovery that harmless microbes could train the immune system reshaped global health.
10 days ago
0
What is the primary reason vaccines use weakened or inactivated forms of pathogens instead of live, harmful ones?
Because live pathogens are too expensive to produce in vaccines.
Because weakened pathogens do not trigger any immune response.
To safely stimulate the immune system without causing the disease.
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Bonbo
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BIOLOGY
Immunology
Antigen
Molecular keys that unlock the immune system's defense arsenal with precision and risk
10 days ago
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Why is the specific binding between an antigen and an antibody or T-cell receptor critical for the immune response?
It ensures the immune system targets the correct foreign molecule, avoiding unnecessary or harmful reactions.
It allows the immune system to attack any molecule indiscriminately to maximize defense.
It prevents the immune system from recognizing any foreign molecules to avoid overreaction.
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