Question

Cells obtained from cancerous tumours are known as
A. Hybridomas
B. Myelomas
C. Lymphocyte
D. Monoclonal cells

Answer 1

Hint: Cancer is a group of diseases caused due to abnormal growth, which have the potential to invade and spread to other parts of the body. This is in contrast with benign tumors, which do not spread. Tumor is a formation of abnormal growth of tissues, during the growth of cells and they divide infinitely times and are immortal. It can be benign or malignant.

Complete answer
Option A Hybridomas: Hybridomas are the cells produced through injection of a specific antigen into a mouse, collection of an antibody-producing cell from the spleen of the mouse and fusion with a tumor cell known as a myeloma cell. Though tumor cells are involved in the production, Hybridomas are not obtained solely from cancerous tumors.
Option A is not correct
Option B Myelomas: Plasma cells are a mature form of lymphocytes and myeloma cells are cancerous plasma cells. Healthy plasma cells are produced in response to viruses, bacteria and other harmful substances. They aid in fighting against the infection by producing special proteins termed as antibodies or immunoglobulins. Myeloma is found in cancer, which affects a type of white blood cell called plasma cell and they are present in the bone marrow. Hence, they are the cancer of plasma cells.
Hence, Option B is correct
Option C Lymphocyte: Lymphocytes are a type of white blood cells. They are not obtained from cancerous tumors.
So, Option C is not correct
Option D Monoclonal cells: Monoclonal cells are a group of cells synthesized from a single ancestral cell through repeated cellular replication in culture. They are also not obtained from cancerous tumors.
Option D is not correct

Hence, Option B is the correct answer.

Note:
Tumor need not always be cancerous. Plasma cells are an important part of the immune system. Myeloma is a cancer of particular white blood cells called plasma cells. Due to the abnormal growth of bone marrow, the cancerous plasma cells build up in the bone marrow. Those cells form a clump in the bone marrow leading to severe and several complications like pneumonia, kidney fracture and blood clot, by suppressing the immune system.