*Question*
Q: What cause rabies, measles, diarrheal diseases, hepatitis, polio, and cold sores? Read this paragraph and choose the correct option from the provided answers: Viruses cause many human diseases. In addition to the diseases mentioned above, viruses cause rabies, measles, diarrheal diseases, hepatitis, polio, and cold sores (see Figure below ). Viral diseases range from mild to fatal. One way viruses cause disease is by causing host cells to burst open and die. Viruses may also cause disease without killing host cells. They may cause illness by disrupting homeostasis in host cells. Choices: - parasites - bacteria - contaminants - viruses A:
**Answer**
viruses

*Question*
Q: The tiny hair present on mucus membranes is known as? Read this paragraph and choose the correct option from the provided answers: Mucous membranes provide a mechanical barrier at body openings. They also line the respiratory, GI, urinary, and reproductive tracts. Mucous membranes secrete mucus , a slimy substance that traps pathogens. The membranes also have hair-like cilia. The cilia sweep mucus and pathogens toward body openings where they can be removed from the body. When you sneeze or cough, pathogens are removed from the nose and throat (see Figure below ). Tears wash pathogens from the eyes, and urine flushes pathogens out of the urinary tract. You can watch the sweeping action of cilia at the following link: http://mcdb. colorado. edu/courses/2115/units/Other/mucus%20animation. swf . Choices: - tissue - collagen - dendrites - cilia A:
**Answer**
cilia

*Question*
Q: What is the primary component of steel alloys? Read this paragraph and choose the correct option from the provided answers: Steels are a very important class of alloys. The many types of steels are primarily composed of iron, with various amounts of the elements carbon, chromium, manganese, nickel, molybdenum, and boron. Steels are widely used in building construction because of their strength, hardness, and resistance to corrosion. Most large modern structures like skyscrapers and stadiums are supported by a steel skeleton (see Figure below ). Choices: - carbon - titanium - alluminum - iron A:
**Answer**
iron

*Question*
Q: Producing light without heat is called what? Read this paragraph and choose the correct option from the provided answers: The sun and other stars produce light because they are so hot. They glow with light due to their extremely high temperatures. This way of producing light is called incandescence . Some objects produce light without becoming very hot. They generate light through chemical reactions or other processes. Producing light without heat is called luminescence . Objects that produce light by luminescence are said to be luminous. Luminescence, in turn, can occur in different ways:. Choices: - osmosis - thermoluminescence - bioluminescence - luminescence A:
**Answer**
luminescence