I never received any answers.
This is what I have thus far. Answers are in blue.
1. Which of the following is not true regarding knowledge gained through scientific investigation?This knowledge can be used to prove or disprove religious beliefs. Scientific knowledge can be used to improve human life through technology. This knowledge has resulted in more efficient sources of energy and better health care. This information can be used to detect problems at an early stage and correct mistakes. Society chooses how scientific information should be used. 2. How does scientific information in peer-reviewed journals differ from that in newspapers? (Points: 1)Information is more technical; readers usually require a background in the field in order to understand the article. The article is written by a reporter, not the researcher. Articles often include political, ethical, and economic ramifications of the scientific findings. Information is less in-depth and easily understood by the average reader. Information is not approved by other scientists before its publication. 3. Which of the following sources of scientific information is the most technical? (Points: 1)general interest news magazines newspapers nonfictional books peer-reviewed journals science magazines 4. The process by which living organisms maintain a fairly constant internal environment despite changes in the external environment is known as: (Points: 1)metabolism. biology. homeostasis. evolution. chemistry. 5. The process by which embryonic cells go through functional and structural changes to become specialized is: (Points: 1)metabolism. homeostasis. differentiation. in vitro fertilization. development. 6. Which of the following is not true regarding receptor proteins? (Points: 1)They are used to receive and transmit information across the plasma membrane. All cells have the same receptor proteins. When a receptor protein binds to a molecule, a series of biochemical reactions occur that eventually cause changes to occur in the cell. The molecule that binds to a receptor protein does not enter the cell. Receptor proteins bind to a specific molecule or group of molecules. 7. Which of the following is not a function of the skin? (Points: 1)production of vitamin D storage of calcium protection from dehydration defense from microorganisms regulation of body temperature 8. Which of the following membranes lines the airways and digestive tract? (Points: 1)serous cutaneous membranous synovial mucous 9. Bulk movement of water across plasma membranes and the exchange of oxygen from blood into cells are similar in that the method of transport is by (Points: 1)facilitated transport. endocytosis. diffusion. active transport. sodium-potassium pumps 10. If diabetes is left untreated, which of the following could develop as a result? (Points: 1)neural disorders kidney failure blindness cardiovascular disorders all of the above 11. The process by which an embryo undergoes rapid changes in form and shape is: (Points: 1)cleavage. fertilization. morphogenesis. implantation. differentiation. 12. Research on the aging process shows that wounds of the elderly heal more slowly and that they are more susceptible to disease. These are problems associated with an aging ________ system. (Points: 1)respiratory immune integumentary digestive endocrine 13. Which of the following is not true of thyroxine? (Points: 1)It is secreted by the parathyroid gland. It regulates the production of ATP. Like triiodothyronine, thyroxine contains iodine. It binds to receptors in target cell nuclei and activates genes. An increase in thyroxine results in an increase in the basal metabolic rate. 14. Which of the following is true regarding estrogen and progesterone? (Points: 1)They are secreted by the ovaries. They are released during a female's reproductive years. They regulate the menstrual cycle. They stimulate the development of female secondary sex characteristics. all of the above 15. Which of the following genotypes results in a female phenotype? (Points: 1)XY XYY X XXY both X and XXY 16. Variations of homologous genes that result in differences in structure and function are: (Points: 1)alleles. loci. autosomes. dominant. linked. 17. Which of the following is true regarding Klinefelter syndrome? (Points: 1)sterility and shows mild mental impairment female phenotype XYY genotype due to nondisjunction of chromosomes after fertilization trisomy 18 genotype 18. Red-green color blindness is an X-linked recessive disorder. Assume that mom is a carrier and dad is color blind. What is the chance that their son will inherit red-green color blindness? (Points: 1)0% 25% 50% 75% 100% 19. Which of the following is not true regarding the circulatory system? (Points: 1)This system ensures that waste products are removed from all tissues of the body. This system is made up of the blood vessels, heart, and blood. The circulatory system has an important role in the exchange of gases in the lungs. During fetal development, the circulatory system develops from the lymphatic system. This system carries excess water and salts to the urinary system. 20. Which of the following is not true regarding the complement system? (Points: 1)This system involves a group of at least 20 proteins found in the blood plasma. During an infection, one protein in this system activates the next in a cascade of reactions. Some components of this system stimulate eosinophils to release histamine. Activated components of this system adhere to bacterial cell walls and then put holes in these cell walls. Some components of this system stick to the walls of bacterial cells, marking them for phagocytosis. 21. When a blood vessel gets damaged, contractions of smooth muscle referred to as ____help constrict the vessels to reduce blood flow. (Points: 1)vascular spasms hemostasis homeostasis formed elements phagocytosis 22. Blood doping, practiced by many athletes involved in the Tour de France and other sports involves the illegal use of drugs to (Points: 1)increase circulation. increase the amount of oxygen carried in the blood. decrease the amount of carbon dioxide in the blood. elevate the rate of hemostasis. increase red bone marrow. 23. Early campaigns of the 19th century that focused on sanitation, hygiene, housing, and nutrition had little effect in controlling communicable disease due to flawed rationale based on theories of miasma or contagion. (Points: 1)TrueFalse24. A hallmark of directly transmitted diseases is that they do not require close personal contact. (Points: 1)TrueFalse25. Most surveillance systems are passive and disease specific. (Points: 1)TrueFalse26. Which of the following sexually transmitted diseases can be cured by the use of antibiotics? (Points: 1)genital herpes AIDS pubic lice gonorrhea hepatitis B 27. Antigenic shift occurs frequently, compared to antigenic drift. (Points: 1)TrueFalse28. Avian influenza has been reported in domestic felines (cats). (Points: 1)TrueFalse29. Two classes of antivirals which are available for influenza are adamantanes and neuraminidase inhibitors. Currently, resistance appears to be an increasing problem for the adamantanes, but not the neuraminidase inhibitors. (Points: 1)TrueFalse30. The mortality curve for the 1918 Spanish flu pandemic was U shaped, indicating the bulk of deaths were among the very young and the very old. (Points: 1)TrueFalse31. Which of the following is not true of influenza viruses? (Points: 1)All strains of influenza virus are highly pathogenic. The influenza virus genome contains RNA rather than DNA. Nutritional factors affect the ability of the influenza virus to cause infection. The relationship between virus and host depends partially on haemaglutinin present on the viral surface. 32. Cellular swelling is a sign of early injury. (Points: 1)TrueFalse33. Which statement best describes a dose-response curve for CANCER? (Points: 1)A line that does not pass through the origin. A curve with a point indicating the Lowest Observed Adverse Effect Level (LOAEL). A line where there is no threshold. None of the above 34. The amount of a xenobiotic compond encountered in the environment is: (Points: 1)Total dose Administered dose Exposure dose Absorbed dose 35. A process of tissue destruction characterized by rapid structural and biochemical changes: (Points: 1)Necrosis Apoptosis Promotion Epigenesis 36. Which of the following is considered to be important in protecting individuals from chemicals? (Points: 1)Type of chemicals they are exposed to The potential levels of exposure The toxicity of the chemicals All of the above 37. When hyperplasia signals a loss of control of cell division, it always results in cancer. (Points: 1)TrueFalse38. Tumor suppressor genes function to increase the activity of cells during times of stress or when conditions do not favor cell division. (Points: 1)TrueFalse39. A mutated form of the p53 gene has been identified in tumors of all of the following types of cancer except: (Points: 1)colon. bladder. breast. stomach. skin. 40. A diet high in red meat and saturated fat increases the risk for ________ cancers. (Points: 1)colon, rectum, and prostate gland breast and liver brain and lung lung, stomach, and liver colon, breast, and liver 41. A mass of rapidly dividing cells that have potentially lost the ability to regulate cell division is (Points: 1)a neoplasm angiogenesis dysplasia hyperplasia keratosis 42. The left ventricle has a more muscular wall than the other three chambers of the heart because the left ventricle: (Points: 1)must generate enough blood pressure to pump blood into the aorta. pumps blood more rapidly than the other chambers. pumps blood into the atria. must decrease the amount of pressure on the blood so it can flow more smoothly. receives blood directly from major arteries. 43. Which of the following is not true regarding atherosclerosis? (Points: 1)Atherosclerosis is a serious contributor to cardiovascular disease in Western nations. High levels of LDLs can result in atherosclerosis. Atherosclerosis affects the myocardium of the heart, interfering with the electrical signals required for heart contraction. Atherosclerosis is also known as "hardening of the arteries." Factors contributing to the development of atherosclerosis include smoking, diabetes, and high blood pressure. 44. Which of the following is not a symptom of botulism? (Points: 1)vomiting paralysis of muscles used for breathing difficulty swallowing double vision rash 45. Which of the following is a correct statement? (Points: 1)Blood pressure is higher in veins than arteries since blood must be returned to the heart. Veins are more distensible than arteries. Veins have a smaller lumen than arteries. The walls of veins are made up of two distinct layers of tissues. Veins carry blood to the capillaries of the body. 46. When the force of blood on the walls of blood vessels drops below normal, the condition is referred to as (Points: 1)blood pressure hypotension hypertension aneurysm none of the above 47. A student noticed that every time he smelled a certain perfume in the hallway, it reminded him of his mother. This is due largely to the activity of the limbic system. (Points: 1)TrueFalse48. Repolarization of a neuron to the resting state requires the activation of sodium-potassium pumps. (Points: 1)TrueFalse49. Which of the following is typical of spinal cord injuries? (Points: 1)Most injuries involve the crushing of axons in the spinal cord. Swelling, caused by bleeding at the site of injury, results in damage to axons. Macrophages sometimes destroy healthy tissue near the site of injury as they attempt to clear the area of debris. Several weeks after the injury, fluid-filled cysts form, blocking nerve signals. all of the above 50. Electrical impulses are transmitted between components of the central nervous system via (Points: 1)glial cells motor neurons sensory neurons interneurons macrophages