Cancer Questions in English

(D) Cancer is characterized by uncontrolled cell division $(A)$.
Benign tumors are typically surrounded by a connective tissue capsule,which prevents them from spreading $(B)$.
Malignant tumors exhibit metastasis,where cancer cells spread to distant parts of the body via blood or lymph vessels $(C)$.
Cancer is $NOT$ an infectious disease; it is a non-communicable disease caused by genetic mutations or environmental factors,not by pathogens. Therefore,the statement that it is infectious is incorrect $(D)$.

(C) Agents that cause cancer are known as $Carcinogens$.
$Carcinogens$ can be physical,chemical,or biological agents that lead to the transformation of normal cells into cancerous cells.
$Oncogenes$ are genes that have the potential to cause cancer,while $Proto-oncogenes$ are normal genes that can become $Oncogenes$ due to mutations or increased expression.

(B) Ionizing radiations (like $X-rays$ and $\gamma-rays$) and non-ionizing radiations (like $UV$ rays) cause damage to $DNA$.
This damage leads to neoplastic transformation of cells,which is a hallmark of cancer development.
Therefore,these radiations cause the transformation of normal cells into neoplastic cells.

(C) Tobacco smoke contains numerous harmful substances,including polycyclic aromatic hydrocarbons,nitrosamines,and other toxic compounds. These substances act as chemical carcinogens that damage $DNA$ and promote the development of cancer,particularly lung cancer. Therefore,they are classified as chemical carcinogens.

(A) Oncogenic viruses are viruses that have the ability to transform normal cells into cancerous cells. These viruses contain genes called viral oncogenes that can disrupt the normal cell cycle and lead to uncontrolled cell division,resulting in the formation of tumors or cancer. Examples include Human Papillomavirus $(HPV)$ and Hepatitis $B$ virus.

(D) Cancer-causing genes are known as $Oncogenes$.
These genes are derived from cellular proto-oncogenes $(c-onc)$ or cellular oncogenes,which are present in normal cells.
When these proto-oncogenes are activated under certain conditions,they lead to oncogenic transformation of the cell,resulting in cancer.
$Carcinogens$ are agents (physical,chemical,or biological) that cause cancer,while $Oncogenesis$ is the process of cancer formation.

(D) Normal cells contain genes called $c-onc$ (cellular oncogenes) or proto-oncogenes.
Under normal conditions,these genes are inactive and regulate normal cell growth and differentiation.
However,when these genes are activated due to various physical,chemical,or biological agents,they transform into oncogenes,which can lead to the oncogenic transformation of the cells,causing cancer.
Therefore,both cellular oncogenes and proto-oncogenes refer to the same genetic potential within normal cells.

(C) Tobacco smoke contains numerous carcinogens,such as polycyclic aromatic hydrocarbons and nitrosamines. When inhaled,these substances damage the $DNA$ of the cells lining the lungs. Chronic exposure leads to mutations that cause uncontrolled cell division,resulting in lung cancer. Therefore,tobacco smoking is the primary cause of lung cancer.

(D) Cancer is classified based on the tissue of origin.
$1$. Carcinoma: Cancer arising from epithelial tissues.
$2$. Sarcoma: Cancer arising from connective tissues.
$3$. Leukemia: Cancer of blood-forming tissues (blood cancer).
$4$. Hybridoma: This is not a type of cancer. It is a cell line produced by fusing a cancer cell (myeloma) with a normal antibody-producing cell ($B$-lymphocyte) to produce monoclonal antibodies.
Therefore,the correct answer is $D$.

(B) Cancer is broadly classified based on the tissue of origin.
$1$. $Carcinoma$: This is a type of cancer that starts in the cells that make up the skin or the tissue lining organs,such as the liver or kidneys. It is the most common form of cancer and originates from epithelial tissues.
$2$. $Sarcoma$: This is a cancer that arises from connective tissues,such as bones,cartilage,fat,muscle,or blood vessels.
$3$. $Leukemia$: This is a cancer of the blood-forming tissues,including the bone marrow,which leads to the overproduction of abnormal white blood cells.
$4$. $Hybridoma$: This is not a type of cancer; rather,it is a laboratory-created cell line formed by fusing a cancer cell with a normal antibody-producing cell,used to produce monoclonal antibodies.
Therefore,the cancer of epithelial tissue is known as $Carcinoma$.

(A) Cancer is broadly classified based on the tissue of origin.
$1$. Carcinoma: Cancer arising from epithelial tissues (e.g.,skin,lining of organs).
$2$. Sarcoma: Cancer arising from connective tissues (e.g.,bone,cartilage,fat).
$3$. Leukemia: Cancer of blood-forming tissues (e.g.,bone marrow).
$4$. Melanoma: $A$ specific type of skin cancer that develops from melanocytes (pigment-producing cells).
While skin cancer is generally a type of carcinoma,'Melanoma' is the specific clinical term used for the most dangerous form of skin cancer arising from melanocytes. Therefore,Melanoma is the most appropriate answer.

(B) Cancer is classified based on the tissue of origin.
Carcinoma refers to cancer that begins in the skin or in tissues that line or cover internal organs,such as epithelial cells.
Breast cancer,lung cancer,and stomach cancer are all examples of carcinomas.
Bone cancer,however,originates in the connective tissue (bone) and is classified as a sarcoma.
Therefore,bone cancer is not a carcinoma.

(C) Cancer is classified based on the tissue of origin.
$1$. Carcinomas arise from epithelial tissues,which line the surfaces of organs and glands.
$2$. Pancreatic cancer originates in the cells of the pancreas (an organ/gland),making it a type of carcinoma.
$3$. Melanoma is a cancer of melanocytes (pigment-producing cells).
$4$. Sarcoma is a cancer of connective tissues (bone,cartilage,fat,muscle).
$5$. Leukemia is a cancer of blood-forming tissues (bone marrow).
Therefore,pancreatic cancer is classified as a carcinoma.

(A) Melanoma is a type of cancer that develops from the pigment-containing cells known as melanocytes.
Since melanocytes are derived from the ectoderm (epithelial tissue),cancers arising from epithelial tissues are classified as Carcinomas.
Therefore,Melanoma is a type of Carcinoma.

(D) Cancer is classified based on the tissue of origin.
$1$. Carcinoma: Cancer arising from epithelial tissues (ectoderm or endoderm).
$2$. Sarcoma: Cancer arising from connective tissues,bones,cartilage,or muscles,which are derived from the mesoderm.
$3$. Leukemia: Cancer of blood-forming tissues.
$4$. Melanoma: Cancer of the pigment-producing cells (melanocytes).
Therefore,cancer arising from mesodermal tissues is called Sarcoma.

(C) Cancer of the lymph nodes is known as $Lymphoma$.
$Leukemia$ is a cancer of the blood-forming tissues,including bone marrow.
$Sarcoma$ is a cancer that begins in the bones and soft tissues.
$Carcinoma$ is the most common type of cancer,which begins in the skin or tissues that line or cover internal organs.

(B) Sarcoma is a type of cancer that develops from connective tissues,such as bones,cartilage,fat,muscle,blood vessels,or fibrous tissues.
$A$. Bone cancer (Osteosarcoma) is a type of sarcoma.
$B$. Lymph node cancer (Lymphoma) is a cancer of the lymphatic system,which is not classified as a sarcoma.
$C$. Pancreatic cancer is typically an adenocarcinoma,which arises from epithelial tissues (carcinoma),not connective tissues.
$D$. Muscle cancer (Rhabdomyosarcoma or Leiomyosarcoma) is a type of sarcoma.
Note: Both $B$ and $C$ are not sarcomas. However,in the context of standard biology questions,Lymphoma is a distinct category of cancer (cancer of the immune system),while Carcinoma is the most common type. Given the options,Lymphoma is the most distinct non-sarcoma category.

(C) Blood cancer is medically known as $Leukemia$.
It is a type of cancer that affects the blood and bone marrow,characterized by the uncontrolled proliferation of white blood cells.
$Carcinoma$ refers to cancer of epithelial tissues,$Sarcoma$ refers to cancer of connective tissues,and $Melanoma$ refers to cancer of melanocytes.

(A) Cancer is broadly classified based on the tissue of origin.
$1$. $Leukemia$ is a type of cancer that affects the blood and bone marrow, characterized by an abnormal increase in the number of white blood cells $(WBCs)$.
$2$. $Carcinoma$ refers to cancers arising from epithelial tissues.
$3$. $Sarcoma$ refers to cancers arising from connective tissues like bone, cartilage, or muscle.
$4$. $Melanoma$ is a type of cancer that develops from melanocytes, the pigment-producing cells in the skin.
Therefore, the correct answer is $Leukemia$.

(B) Leukemia is a type of cancer of the blood or bone marrow characterized by an abnormal increase in the number of immature white blood cells (leukocytes) in the body.
In this condition,the bone marrow produces large quantities of abnormal white blood cells that do not function properly and crowd out healthy blood cells.
Carcinoma refers to cancer of epithelial tissues,Melanoma is cancer of melanocytes,and Chondrosarcoma is cancer of cartilage.

(B) Leukemia is a type of cancer of the blood or bone marrow characterized by an abnormal increase in the number of white blood cells (leukocytes). In this condition,the bone marrow produces excessive amounts of immature or abnormal white blood cells,which do not function properly and crowd out healthy blood cells.

(B) Leukemia is a type of cancer of the blood-forming tissues,including the bone marrow.
It is characterized by an abnormal and uncontrolled increase in the number of white blood cells $(WBCs)$ in the blood.
Since leukemia originates in the bone marrow,option $(C)$ is incorrect.
Therefore,the correct observation is a significant increase in the number of white blood cells.

(B) $Pap$ $smear$ (Papanicolaou test) is a screening procedure used to detect potentially precancerous and cancerous processes in the cervix or uterus. During this test,cells are gently scraped from the cervix and examined under a microscope to identify any abnormal changes. Therefore,the correct option is $B$.

(D) Techniques like $C.T.$ (Computed Tomography) and $MRI$ (Magnetic Resonance Imaging) are very useful to detect cancers of the internal organs.
$C.T.$ uses $X$-rays to generate a three-dimensional image of the internals of an object.
$MRI$ uses strong magnetic fields and non-ionizing radiations to accurately detect pathological and physiological changes in the living tissue.
Therefore,both $C.T.$ and $MRI$ are used for the detection of cancer in internal organs.

(D) Cancer treatment involves a combination of various approaches to eliminate or control the growth of malignant cells.
$1$. Surgery: Used to remove the tumor mass physically.
$2$. Radiation therapy: Uses high-energy radiation to kill cancer cells or damage their $DNA$,preventing them from dividing.
$3$. Immunotherapy: Uses biological response modifiers to boost the patient's immune system to fight cancer cells.
$4$. Chemotherapy: Uses drugs to kill rapidly dividing cells.
Since surgery,radiation therapy,and immunotherapy are all standard methods used in cancer treatment,the correct answer is $D$.

(D) Anti-cancer drugs are designed to target rapidly dividing cells,which is a characteristic of cancer cells. However,these drugs are not selective and also affect healthy cells that divide rapidly,such as hair follicle cells and bone marrow cells.
$1$. Hair loss (alopecia) occurs because hair follicle cells are damaged.
$2$. Anemia occurs because the production of red blood cells in the bone marrow is suppressed.
Therefore,both hair loss and anemia are common side effects of chemotherapy.

(A) Biological response modifiers like $\alpha$-interferons are used to treat cancer because they activate the immune system and help in destroying the tumor.
Insulin is a hormone used to regulate blood glucose levels in diabetes mellitus.
Steroids are generally used as anti-inflammatory or immunosuppressive agents.
Therefore, $\alpha$-interferon is the correct example of an anticancer drug.

(A) The correct matching is as follows:
$(a)$ Carcinoma: These are cancers of epithelial tissues, such as lung cancer $(iii)$.
$(b)$ Sarcoma: These are cancers of connective tissues, such as lymph node cancer (often classified as lymphoma, but in this context, it refers to connective tissue/lymphatic involvement) $(ii)$.
$(c)$ Leukemia: This is cancer of the blood-forming tissues, resulting in blood cancer $(iv)$.
$(d)$ Melanoma: This is a type of skin cancer arising from melanocytes $(i)$.
Therefore, the correct sequence is $(a-iii), (b-ii), (c-iv), (d-i)$.

(A) Melanoma is a type of cancer that arises from melanocytes,which are pigment-producing cells found in the basal layer of the epidermis.
Carcinoma is a type of cancer that originates from epithelial cells.
Since melanocytes are derived from the ectoderm and are considered specialized epithelial cells,melanoma is classified as a type of carcinoma.
Therefore,both the statement and the reason are correct,and the reason correctly explains the classification of melanoma.

(A) The classification of cancer is based on the tissue of origin:
$1$. $Carcinoma$ arises from epithelial tissues (e.g.,lung,breast,colon).
$2$. $Sarcoma$ arises from connective tissues (e.g.,bone,cartilage,fat,muscle).
$3$. $Melanoma$ arises from melanocytes (pigment-producing cells in the skin).
$4$. $Leukemia$ is a cancer of blood-forming tissues (e.g.,bone marrow),leading to an overproduction of white blood cells.
Therefore,$Carcinoma – Lung cancer$ is the correct match.

(B) Leukaemia is a type of cancer that affects the blood and bone marrow. It is characterized by an abnormal and uncontrolled increase in the number of white blood cells $(WBCs)$ in the body. This condition interferes with the production of normal blood cells,leading to various health complications.

(C) Metastasis is a characteristic property of malignant tumors. It is the process by which cancer cells break away from the primary tumor,travel through the blood or lymphatic system,and form new tumors (secondary tumors) in other parts of the body. This is the most dangerous aspect of cancer.

(B) Sarcoma is a type of cancer that arises from transformed cells of mesenchymal origin.
These tissues include connective tissues such as bone,cartilage,fat,muscle,vascular,or hematopoietic tissues.
Since these tissues are derived from the mesoderm during embryonic development,sarcoma is specifically associated with the abnormal growth of mesodermal tissue.
In contrast,carcinoma arises from epithelial cells,and leukemia arises from bone marrow/blood-forming tissues.

(A) Cancer is characterized by the uncontrolled and abnormal division of cells,which leads to the formation of a mass of cells known as a tumor or neoplasm.
Normal cells show a property called 'contact inhibition' by which contact with other cells inhibits their uncontrolled growth.
Cancer cells lose this property,resulting in continuous,uncontrolled cell division that invades surrounding tissues.

(A) Carcinoma is a type of cancer that originates in the epithelial cells,which line the surfaces of the body,such as the skin or the lining of internal organs (mucous membranes).
Since these cells are epithelial in origin,their malignant transformation results in carcinoma.
Sarcoma,on the other hand,refers to malignant tumors arising from connective tissues.
Therefore,the correct association for carcinoma is a malignant tumor of the skin or mucous membrane.

(C) Tobacco consumption is a major risk factor for various types of cancers.
Specifically,the use of tobacco (chewing or smoking) is strongly associated with the development of cancer of the oral cavity (mouth cancer).
Carcinogens present in tobacco,such as polycyclic aromatic hydrocarbons and nitrosamines,damage the $DNA$ of cells in the lining of the mouth,leading to uncontrolled cell division and tumor formation.
Therefore,the correct option is $C$.

(C) $1$. $A$ is incorrect: Benign tumors do not show metastasis; they remain confined to their original location.
$2$. $B$ is incorrect: Heroin is a depressant,which slows down physiological functions.
$3$. $C$ is correct: Malignant tumors are characterized by metastasis,where cancer cells spread to distant sites through blood or lymph.
$4$. $D$ is incorrect: Cannabinoids are known for their effects on the cardiovascular system and are not typically used as post-surgical painkillers; opioids like morphine are used for that purpose.

(B) Cancer cells exhibit uncontrolled division due to various genetic mutations.
$(a)$ Mutations often inactivate tumor suppressor genes,which are responsible for cell cycle control,leading to unchecked growth.
$(b)$ Cancer cells typically show increased telomerase activity,which allows them to divide indefinitely. Mutations do not inhibit telomerase; rather,they often lead to its overexpression or activation. Therefore,this statement is false.
$(c)$ Mutations in proto-oncogenes convert them into oncogenes,which promote and accelerate the cell cycle.
$(d)$ Mutations can destroy or inactivate telomerase inhibitors,further contributing to the immortal nature of cancer cells.
Thus,the statement that is not true is $(b)$.

(D) : Contact inhibition is a property of normal cells by virtue of which contact with other cells inhibits their uncontrolled growth. Cancerous cells lack this property,which allows them to continue dividing and form tumors.

(A) $MRI$ is the safest technique for the detection of cancers.
$1$. Radiography $(X-ray)$ and $CT$ scans use ionizing radiation, which can be harmful to tissues and potentially increase the risk of cancer.
$2$. Histopathological studies are invasive techniques that require biopsy, which involves surgical removal of tissue.
$3$. $MRI$ uses strong magnetic fields and non-ionizing radio waves to accurately detect pathological and physiological changes in living tissues without exposing the patient to harmful radiation.

(C) : Tumours are of two types: benign and malignant. Malignant tumours exhibit metastasis. This is the phenomenon in which cancer cells spread to distant sites through body fluids to develop secondary tumours.

(C) $MRI$ (Magnetic Resonance Imaging) uses strong magnetic fields and non-ionizing radiations to accurately detect pathological and physiological changes in living tissue.
It is a highly effective diagnostic technique for detecting cancer without exposing the patient to harmful ionizing radiation.

(B) $X$ is correct: Chemical carcinogens present in tobacco smoke are well-known causes of lung cancer.
$Y$ is incorrect: $CT-SCAN$ (Computed Tomography) uses $X-rays$ to generate three-dimensional images of the internal organs. Magnetic Resonance Imaging $(MRI)$ is the technique that uses strong magnetic fields and non-ionizing radiation to detect pathological and physiological changes in living tissue.

(A) Cancer detection is based on biopsy and histopathological studies of the tissue and blood and bone marrow tests for increased cell counts in the case of leukemias.
In addition,techniques like radiography (use of $X$-rays),$CT$ (Computed Tomography),and $MRI$ (Magnetic Resonance Imaging) are very useful to detect cancers of the internal organs.
$A$ is the correct option because $MRI$ uses strong magnetic fields and non-ionizing radiations to accurately detect pathological and physiological changes in the living tissue.
$B$ (Widal test) is used for the diagnosis of typhoid fever.
$C$ $(ELISA)$ is used for the detection of pathogens like $HIV$.

(A) $1$. $AIDS$ (Acquired Immuno Deficiency Syndrome) is an infectious disease caused by the $HIV$ virus.
$2$. Typhoid is an infectious disease caused by the bacterium $Salmonella \text{ } typhi$.
$3$. Asthma is a chronic respiratory condition, but it is generally not the leading cause of death compared to cancer.
$4$. Cancer is a non-infectious disease characterized by uncontrolled cell division and is one of the leading causes of death globally.

(D) Cancer detection is based on biopsy and histopathological studies of the tissue and blood and bone marrow tests for increased cell counts in the case of leukemias.
In addition to these,techniques like radiography (use of $X$-rays),computed tomography $(CT)$,and magnetic resonance imaging $(MRI)$ are very useful to detect cancers of the internal organs.
Computed tomography uses $X$-rays to generate a three-dimensional image of the internals of an object.
$MRI$ uses strong magnetic fields and non-ionizing radiations to accurately detect pathological and physiological changes in the living tissue.
Therefore,all the mentioned techniques are used for the detection of cancer in internal organs.

(A) Statement $X$ is incorrect because $CO$ (Carbon Monoxide) is a toxic gas that binds to hemoglobin,reducing oxygen transport; it is not a carcinogen responsible for skin cancer. Skin cancer is typically caused by $UV$ radiation.
Statement $Y$ is correct because $MRI$ (Magnetic Resonance Imaging) uses strong magnetic fields and non-ionizing radio waves to generate detailed images of internal organs and tissues,which is a standard diagnostic tool for detecting tumors and cancer.

(B) Cancer diagnosis involves several techniques to detect the presence of malignant cells.
$1$. Biopsy: $A$ piece of the suspected tissue is cut into thin sections,stained,and examined under a microscope by a pathologist (histopathological studies).
$2$. Radiography ($X$-ray),$CT$ (Computed Tomography),and $MRI$ (Magnetic Resonance Imaging) are very useful to detect cancers of the internal organs.
$3$. $ELISA$ and $Western$ $Blot$ are typically used for detecting infections like $HIV$,not for cancer diagnosis.
$4$. Immunotherapy and surgery are treatment methods,not diagnostic methods.
Therefore,Biopsy and $MRI$ are the correct diagnostic methods.

(C) Leukemia is a type of cancer that affects the blood and bone marrow.
It is characterized by the abnormal and uncontrolled production of white blood cells (leukocytes) in the body.
These immature or abnormal cells crowd out healthy blood cells,leading to symptoms like anemia,frequent infections,and bleeding.
Therefore,Leukemia is commonly referred to as Blood Cancer.

(D) Cancer detection is based on biopsy and histopathological studies of the tissue and blood and bone marrow tests for increased cell counts in the case of leukemias.
In the case of cancers of the internal organs,techniques like Radiography (use of $X$-rays),$CT$ (Computed Tomography) scan,and $MRI$ (Magnetic Resonance Imaging) are very useful.
$ELISA$ is used for the detection of pathogens or antibodies (e.g.,$HIV$ or $AIDS$ detection).
$Widal$ test is used for the diagnosis of typhoid fever.
Therefore,the techniques useful for detecting cancers of internal organs are $1$ (Radiography),$3$ $(CT-Scan)$,and $4$ $(MRI)$.