Test Bank & Solution Manual For Human Diseases, 6th Edition by Neighbors (All Chapters included)

Test Bank & Solution Manual For Human Diseases, 6th Edition by Neighbors (All Chapters included) Part I: Introduction to Human Diseases 1. What is the primary distinction between communicable and non-communicable diseases? − A) Communicable diseases are genetic, while non-communicable are not. B) Communicable diseases can be transmitted from person to person, while non-communicable cannot. C) Non-communicable diseases are always chronic, while communicable are always acute. D) Non-communicable diseases are caused by bacteria, while communicable are caused by viruses. − Answer: B − Explanation: Communicable diseases are those that can be transmitted from one individual to another through various means such as direct contact, airborne particles, or vectors. Non-communicable diseases (NCDs) cannot be transmitted between people and are usually chronic, resulting from a combination of genetic, physiological, environmental, and behavioral factors. 2. Which of the following best describes a nosocomial infection? − A) An infection acquired during travel B) An infection present at birth C) An infection acquired in a hospital setting D) An infection transmitted by insects − Answer: C − Explanation: Nosocomial infections, also known as hospital-acquired infections, are infections that patients acquire while receiving treatment for other conditions within a healthcare setting. 3. Which term refers to the occurrence of a disease in a population at a specific time? − A) Prevalence B) Incidence C) Morbidity D) Mortality − Answer: A − PAGE 4 − Explanation: Prevalence refers to the total number of cases of a disease present in a population at a given time, whereas incidence refers to the number of new cases that develop in a specific time period. 4. What is the main purpose of vaccination in disease prevention? − A) To eliminate pathogens from the environment B) To provide immediate immunity after exposure C) To stimulate the immune system to develop immunity D) To replace lost immune cells − Answer: C − Explanation: Vaccination works by stimulating the body's immune system to recognize and fight specific pathogens, thereby providing immunity without causing the disease itself. Part II: Mechanisms of Disease 5. Which process involves programmed cell death and is crucial for removing damaged or unnecessary cells? − A) Necrosis B) Apoptosis C) Autophagy D) Phagocytosis − Answer: B − Explanation: Apoptosis is a controlled, programmed process of cell death that helps maintain healthy tissues by eliminating old, unnecessary, or damaged cells without causing inflammation. 6. Inflammation is characterized by all the following EXCEPT: A) Redness B) Swelling C) Pain D) Hypothermia − Answer: D − Explanation: Inflammation typically involves redness (rubor), swelling (tumor), heat (calor), pain (dolor), and loss of function (functio laesa). Hypothermia (abnormally low body temperature) is not a characteristic of inflammation. 7. Which type of hypersensitivity reaction is mediated by T cells and does not involve antibodies? − A) Type I B) Type II C) Type III D) Type IV − Explanation: PAGE 5 − Answer: D − Explanation: Type IV hypersensitivity, also known as delayed-type hypersensitivity, is mediated by T cells rather than antibodies and typically occurs hours to days after exposure to an antigen. 8. What is the primary role of cytokines in the immune response? − A) To directly kill pathogens B) To serve as antigens C) To mediate and regulate immunity, inflammation, and hematopoiesis D) To produce antibodies − Answer: C − Explanation: Cytokines are signaling proteins that play critical roles in mediating and regulating immune responses, inflammation, and the formation of blood cells (hematopoiesis). 9. Oxidative stress in cells is primarily caused by an imbalance between the production of reactive oxygen species (ROS) and what? − A) Antioxidant levels B) ATP production C) DNA repair mechanisms D) Protein synthesis − Answer: A Oxidative stress occurs when there is an imbalance between the production of reactive oxygen species (ROS) and the body's ability to detoxify these reactive intermediates or repair the resulting damage, often due to insufficient antioxidant levels. Part III: Neoplasms 10. What is the primary difference between benign and malignant tumors? − A) Benign tumors are non-proliferative, while malignant are proliferative B) Malignant tumors can invade and metastasize, while benign cannot C) Benign tumors occur only in epithelial tissues D) Malignant tumors are always cancerous, while benign are not − Answer: B − Explanation: Malignant tumors have the ability to invade surrounding tissues and metastasize to distant sites in the body, whereas benign tumors do not invade or spread. − PAGE 6 11. The process by which cancer cells spread from the original site to other parts of the body is called: − A) Differentiation B) Apoptosis C) Metastasis D) Angiogenesis − Answer: C − Explanation: Metastasis is the process by which cancer cells break away from the original (primary) tumor, travel through the blood or lymphatic system, and form new (secondary) tumors in other organs or tissues. 12. Which genetic mutation is most commonly associated with familial breast and ovarian cancers? − A) TP53 B) BRCA1 C) MYC D) KRAS − Answer: B − Explanation: Mutations in the BRCA1 (and BRCA2) genes significantly increase the risk of developing breast and ovarian cancers and are commonly associated with familial cancer syndromes. 13. Oncogenes are mutated forms of which normal genes? A) Tumor suppressor genes B) Proto-oncogenes C) DNA repair genes D) Apoptosis genes − Answer: B − Explanation: Oncogenes are mutated or overexpressed forms of proto-oncogenes, which are normal genes that regulate cell growth and differentiation. When proto-oncogenes become oncogenes, they can contribute to uncontrolled cell proliferation. 14. The "two-hit hypothesis" is primarily associated with which type of genes in cancer development? − A) Oncogenes B) Proto-oncogenes C) Tumor suppressor genes D) DNA repair genes − Answer: C − Explanation: PAGE 7 − Explanation: The "two-hit hypothesis," proposed by Knudson, suggests that both alleles of a tumor suppressor gene must be inactivated or mutated for cancer to develop. This is distinct from oncogenes, where a single mutation can promote cancer. Part IV: Inflammation and Infection 15. Which white blood cell type is primarily responsible for antibody production? − A) Neutrophils B) Eosinophils C) B lymphocytes D) T lymphocytes − Answer: C − Explanation: B lymphocytes (B cells) are responsible for producing antibodies as part of the humoral immune response. 16. Which of the following is NOT a common clinical sign of acute inflammation? − A) Redness B) Heat C) Pus D) Chronic pain − Answer: D Acute inflammation typically presents with redness, heat, swelling, pain, and sometimes pus. Chronic pain is not specifically a clinical sign of acute inflammation. 17. Which pathogen is responsible for causing tuberculosis? − A) Mycobacterium tuberculosis B) Streptococcus pneumoniae C) Escherichia coli D) Staphylococcus aureus − Answer: A − Explanation: Mycobacterium tuberculosis is the bacterial pathogen responsible for tuberculosis, a serious infectious disease that primarily affects the lungs. 18. The formation of granulomas is most commonly associated with which type of infection? − A) Viral B) Bacterial C) Fungal D) Parasitic − PAGE 8 − Answer: B and C (depending on context) − Explanation: Granulomas are organized collections of macrophages that form in response to chronic inflammatory stimuli, often due to persistent bacterial infections like Mycobacterium tuberculosis or certain fungal infections. − Note: Depending on the specific context, granulomas can be associated with both bacterial and fungal infections. 19. Which of the following is a key feature distinguishing viral infections from bacterial infections? − A) Viruses can be treated with antibiotics B) Bacterial infections do not cause inflammation C) Viruses require host cells to replicate D) Bacteria are always larger than viruses − Answer: C − Explanation: Unlike bacteria, viruses cannot replicate on their own and require host cells to reproduce. Antibiotics are ineffective against viruses, bacterial infections often cause inflammation, and while bacteria are generally larger, size alone is not a definitive distinguishing feature.