Question

figure 3: reproduction cycle of structure x
structure x (with dna)
(1)
structure y (with dna)
(2)
(3)
(4)
(5)
based on the information, which part of the cell theory can be used to confirm whether that structure x is a cell?
a. presence of dna
b. use of structure y to reproduce
c. passing on of genetic material
d. use of organelles for division

Explanation:

To solve this, we analyze the options based on the diagram (likely about viral/bacterial reproduction, maybe bacteriophage):

• Option A: Presence of DNA – Many entities have DNA, not specific to distinguishing a cell from a virus (viruses can have DNA/RNA, cells have DNA). Eliminate.
• Option B: Use of Structure X (likely a virus, e.g., bacteriophage) to reproduce – Viruses require host cells to reproduce (they inject DNA into host cells), while cells reproduce independently (e.g., binary fission). This is a key distinction: cells reproduce on their own, viruses need hosts.
• Option C: Passing on of genetic material – Both cells (via division) and viruses (via infection) pass genetic material. Not a distinguishing factor. Eliminate.
• Option D: Use of organelles for energy – Some cells (prokaryotes, like Structure Y, likely a bacterium) lack organelles (no mitochondria) but still produce energy (e.g., via cell membrane). Viruses have no organelles, but this is not the best distinction (prokaryotes also lack organelles). Eliminate.

Answer:

B. Use of Structure X to reproduce