Membrane attack complex (MAC) kills by
allowing the organelles to spill free from the bacteria
disrupting the selectively permeability of a bacteria's plasma membrane
penetrating the capsule of the bacteria giving antibiotic drugs access to bacterial cells
providing a passage for antibodies to enter into the bacterial cytosol
The Correct Answer is B
A. Allowing the organelles to spill free from the bacteria: Bacteria do not have membrane-bound organelles, so this mechanism is not applicable. The membrane attack complex does not function by releasing organelles but targets the plasma membrane itself.
B. Disrupting the selective permeability of a bacteria's plasma membrane: The MAC forms pores in the bacterial plasma membrane, disrupting its integrity and allowing ions and water to flow uncontrollably. This loss of membrane selectivity leads to cell lysis and death, effectively killing the bacteria.
C. Penetrating the capsule of the bacteria giving antibiotic drugs access to bacterial cells: The MAC does not facilitate antibiotic entry. Its function is independent of drug therapy and directly lyses bacterial cells by forming transmembrane channels.
D. Providing a passage for antibodies to enter into the bacterial cytosol: Antibodies cannot enter bacterial cytosol via MAC. The MAC kills bacteria through pore formation that disrupts osmotic balance, not by transporting antibodies into the cell.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Antigenic:“Antigenic” is not a classification of T cells. It describes a property of a substance that can trigger an immune response, not a type of T lymphocyte.
B. Cytotoxic:Cytotoxic T cells (CD8+) directly kill infected or abnormal cells. They are a major type of T cell responsible for cell-mediated immunity and defense against viruses and cancer cells.
C. Regulatory:Regulatory T cells (Tregs) modulate the immune response by suppressing excessive or inappropriate activation. They help maintain immune tolerance and prevent autoimmune reactions.
D. Helper:Helper T cells (CD4+) assist other immune cells by releasing cytokines that stimulate B cells, cytotoxic T cells, and macrophages. They are essential for orchestrating the adaptive immune response.
Correct Answer is C
Explanation
A. Forming a large number of cytotoxic cells:Cytotoxic cells are produced by T lymphocytes, notB cells. B cells respond to antigens primarily by producing antibodies and memory cells, not cytotoxic T cells.
B. Immediately producing antigen-specific antibodies:B cells require activation and clonal expansion before producing significant amounts of antibodies. The response is not instantaneous; there is a latent period during the primary immune response.
C. Producing progeny cells that include plasma cells and memory cells:Upon activation, B cells undergo clonal selection and differentiate into plasma cells, which secrete antibodies, and memory B cells, which provide long-term immunity. This is the hallmark of the primary adaptive immune response.
D. Reducing its size:B cells do not shrink in response to antigen exposure. Instead, they proliferate and differentiate to mount an effective immune response.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.