Table of contents

1. Overview of Cell Biology2h 49m
2. Chemical Components of Cells1h 14m
3. Energy1h 33m
4. DNA, Chromosomes, and Genomes2h 31m
5. DNA to RNA to Protein2h 31m
6. Proteins1h 36m
7. Gene Expression1h 42m
8. Membrane Structure1h 4m
- The Lipid Bilayer
  38m
- Membrane Proteins
  25m
9. Transport Across Membranes1h 52m
10. Anerobic Respiration1h 5m
11. Aerobic Respiration1h 11m
12. Photosynthesis52m
13. Intracellular Protein Transport2h 18m
14. Cell Signaling1h 28m
15. Cytoskeleton and Cell Movement1h 39m
16. Cell Division3h 5m
17. Meiosis and Sexual Reproduction50m
18. Cell Junctions and Tissues48m
19. Stem Cells13m
- Stem Cells
  13m
20. Cancer44m
21. The Immune System1h 6m
22. Techniques in Cell Biology1h 41m

20. Cancer

Carcinogens

Cell Biology

20. Cancer

Carcinogens

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Multiple Choice

Which of the following statements about carcinogens is true?

Carcinogens are substances that can cause cancer by inducing genetic mutations.

Carcinogens are only found in synthetic chemicals and never in natural substances.

All carcinogens are harmless to human health.

Carcinogens only affect animals and not humans.

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Verified step by step guidance

Understand the definition of carcinogens: Carcinogens are substances or agents that can lead to cancer by causing genetic mutations or disrupting cellular processes.

Evaluate the first statement: 'Carcinogens are substances that can cause cancer by inducing genetic mutations.' This aligns with the definition of carcinogens and is likely true.

Analyze the second statement: 'Carcinogens are only found in synthetic chemicals and never in natural substances.' This is incorrect because carcinogens can be found in both synthetic (e.g., industrial chemicals) and natural substances (e.g., aflatoxins from mold).

Examine the third statement: 'All carcinogens are harmless to human health.' This is false because carcinogens, by definition, are harmful as they increase the risk of cancer.

Review the fourth statement: 'Carcinogens only affect animals and not humans.' This is incorrect because carcinogens can affect both humans and animals, as cancer is not species-specific.