Question:
How can you differentiate between cancerous and non-cancerous cells in culture by microscopic examination? Give one example of each of such cell types.
How can you differentiate between cancerous and non-cancerous cells in culture by microscopic examination? Give one example of each of such cell types.
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Normal cells undergo senescence and die after a set number of divisions (the Hayflick Limit), whereas cancer cells express the enzyme telomerase, making them immortal in culture.
Updated On: Jun 19, 2026
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Solution and Explanation
Step 1: Concept
Cancerous and non-cancerous cells exhibit distinct differences in morphology, growth patterns, and social behavior when cultured in vitro.
Step 2: Microscopic Differences
Under microscopic examination, researchers can distinguish these cells using several key features:
[H] {|l|l|l|} Feature & Non-Cancerous Cells & Cancerous Cells
1. Contact Inhibition & Exhibit contact inhibition; form a & Lose contact inhibition; form multi-
& single, organized monolayer. & layered clumps (foci).
2. Anchorage & Require a solid substrate to attach & Grow in suspension (anchorage-
Dependence & and grow (anchorage-dependent). & independent).
3. Cell Morphology & Uniform size and shape with clear, & Irregular, variable shapes
& structured cytoskeletal organization. & (pleomorphism) and loose structures.
4. Nuclear Features & Small, single nucleus with a low & Large, irregular nuclei, multiple nucleoli,
& nuclear-to-cytoplasmic ratio. & and a high nuclear-to-cytoplasmic ratio.
{
Step 3: Cell Type Examples
- Non-cancerous cell type example: NIH3T3 (mouse embryonic fibroblast cell line) or primary human dermal fibroblasts.
- Cancerous cell type example: HeLa cells (cervical cancer cell line) or MCF-7 (breast cancer cell line).
Final Answer: Cancerous cells are differentiated by their loss of contact inhibition (piling up in clumps), anchorage independence, pleomorphic shapes, and enlarged nuclei. Examples are NIH3T3 (non-cancerous fibroblasts) and HeLa (cancerous cervical cells).
Cancerous and non-cancerous cells exhibit distinct differences in morphology, growth patterns, and social behavior when cultured in vitro.
Step 2: Microscopic Differences
Under microscopic examination, researchers can distinguish these cells using several key features:
[H] {|l|l|l|} Feature & Non-Cancerous Cells & Cancerous Cells
1. Contact Inhibition & Exhibit contact inhibition; form a & Lose contact inhibition; form multi-
& single, organized monolayer. & layered clumps (foci).
2. Anchorage & Require a solid substrate to attach & Grow in suspension (anchorage-
Dependence & and grow (anchorage-dependent). & independent).
3. Cell Morphology & Uniform size and shape with clear, & Irregular, variable shapes
& structured cytoskeletal organization. & (pleomorphism) and loose structures.
4. Nuclear Features & Small, single nucleus with a low & Large, irregular nuclei, multiple nucleoli,
& nuclear-to-cytoplasmic ratio. & and a high nuclear-to-cytoplasmic ratio.
{
Step 3: Cell Type Examples
- Non-cancerous cell type example: NIH3T3 (mouse embryonic fibroblast cell line) or primary human dermal fibroblasts.
- Cancerous cell type example: HeLa cells (cervical cancer cell line) or MCF-7 (breast cancer cell line).
Final Answer: Cancerous cells are differentiated by their loss of contact inhibition (piling up in clumps), anchorage independence, pleomorphic shapes, and enlarged nuclei. Examples are NIH3T3 (non-cancerous fibroblasts) and HeLa (cancerous cervical cells).
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