IB Biology SL C3.2 Defence against disease questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

Question 1

Multiple choiceMedium1 mark

A patient is diagnosed with a viral infection, and an antibiotic is considered. Which explanation accounts for why the antibiotic will not control the infection?

Show answer and explanation

Answer: B. Antibiotics block processes that occur in bacteria but not in eukaryotic cells. Viruses rely on host-cell processes to reproduce, so they do not carry out the bacterial processes targeted by antibiotics.
A: correctly identifies viral reliance on human cells, but incorrectly claims the antibiotic target is shared with human cells.
C: identifies the bacterial target, but incorrectly states that viruses reproduce independently of host cells.
D: correctly describes viral reliance on host cells, but reverses the selectivity of antibiotics.
Remember: antibiotics target bacterial processes, not viral reproduction in host cells.

The best questions are still waiting

Unlock every question in this topic, then type, photograph or draw your answer and have it marked against the markscheme. Find out where you are dropping marks.