Question

multiple choice question
nk cells induce apoptosis in virally infected cells by secreting which protein-degrading enzymes?

perforins
complement
granzymes

Explanation:

To solve this, we analyze each option:

• "Perforins" (note: likely a typo for "Perforins") are pore - forming proteins, not protein - degrading enzymes.
• "Complement" proteins are part of the immune system's complement cascade, not secreted by NK cells to induce apoptosis of virally infected cells.
• "Granzymes" are protein - degrading enzymes (serine proteases) that NK cells secrete to induce apoptosis in virally infected cells.

Answer:

C. Granzymes (assuming the options are labeled A: Performs, B: Complement, C: Granzymes; if the first option is a typo for "Perforins", the correct one is Granzymes)