Which of the following is a good reason for why tobacco smoke is considered a carcinogen?

it causes mutations leading to cancer.
it causes mutations leading to apoptosis.
it causes mutations leading to inhibition of cell division.

Ans.

Carcinogens can be defined as a physical and chemical agent that leads to development of cancer (carcinogenesis), such as radiation, toxic chemicals, and tumor-causing viruses due to mutations in genetic material of cells.

Tobacco is considered as a carcinogen as it can cause lung cancer, mouth cancer, and various other types of cancer. Tobacco contains around seventy chemicals, which promote or initiate cancer and make it a potent carcinogen.

Thus, the correct answer is option). 'it causes mutations leading to cancer.'

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.