A researcher introduces a novel antigen into a mouse model genetically deficient in functional T helper cells. Which consequence regarding antibody production is most likely?

💡 Explanation

In the absence of T helper cells, B cells cannot effectively receive the signals needed for isotype switching; therefore, class switching will be severely reduced because T helper cells provide crucial signals through CD40L interaction, rather than other pathways that can compensate completely.

• Which physiological effect results when ovarian reserve declines?
• A patient with chronic kidney disease exhibits elevated serum TSH despite normal T4 levels. Why does this thyroid hormone dysregulation occur in this context?
• Following a severe burn, which outcome relating to prostaglandin synthesis is MOST likely to worsen systemic inflammation and delay wound healing?
• Why does bariatric surgery often cause type 2 diabetics to rapidly reduce or eliminate their need for insulin injections?
• Why does severe angioedema, characterized by rapid swelling, potentially cause airway obstruction during anaphylaxis?
• Why does calcium oxalate crystallization sometimes still occur in individuals taking potassium citrate for kidney stones?