Question

figure 1 figure 2 figure 3
figure 3: structure x and structure y
structure x (a bacteriophage: labeled with dna, head, tail fibers) and structure y (a bacterium: labeled with dna, cell wall, plasma membrane, ribosome, cytoplasm, flagellum)
based on figure 3, structure x and structure y both have --
a. a cell wall, which maintains a rigid shape
b. dna, which both replicate using mitosis
c. a flagellum, which structure y uses to defend itself against structure x
d. dna, which structure x replicates using the organelles of structure y

Explanation:

• Analyze Option A: Structure X (bacteriophage, a virus) lacks a cell wall, so A is incorrect.
• Analyze Option B: Structure X (virus) doesn't undergo mitosis (it replicates by hijacking host cells), and Structure Y (bacterium, prokaryote) also doesn't use mitosis (uses binary fission), so B is incorrect.
• Analyze Option C: Structure X is a virus that infects Structure Y (bacterium), and the flagellum of Y is for movement, not defense against X, so C is incorrect.
• Analyze Option D: Structure X (virus) has DNA and replicates by using the organelles (like ribosomes, etc.) of Structure Y (bacterium) to synthesize viral components, which matches.

Answer:

D. DNA, which structure X replicates using the organelles of structure Y