Answer the following question given this paragraph: An antigen that causes an allergy is called an allergen. Q: What is defined as an antigen that causes an allergy? Choices: - an expectorant - a disinfectant - a pollutant - an allergen A:
an allergen
Answer the following question given this paragraph: Biomass is another renewable source of energy. Biomass includes wood, grains, and other plant materials or waste materials. People can burn wood directly for energy in the form of heat. Biomass can also be processed to make biofuel. Biofuel is a fairly new type of energy that is becoming more popular. Biomass is useful because it can be made liquid. This means that they can be used in cars and trucks. Some car engines can be powered by pure vegetable oil or even recycled vegetable oil. Sometimes the exhaust from these cars smells like French fries!. Q: Biomass can also be processed to make what kind of fuel? Choices: - hydrogen fuel - gasoline - fossil - biofuel A:
biofuel
Q: Answer the following question given this paragraph: The osteoblast is the bone cell responsible for forming new bone and is found in the growing portions of bone, including the periosteum and endosteum. Osteoblasts, which do not divide, synthesize and secrete the collagen matrix and calcium salts. As the secreted matrix surrounding the osteoblast calcifies, the osteoblast become trapped within it; as a result, it changes in structure and becomes an osteocyte, the primary cell of mature bone and the most common type of bone cell. Each osteocyte is located in a space called a lacuna and is surrounded by bone tissue. Osteocytes maintain the mineral concentration of the matrix via the secretion of enzymes. Like osteoblasts, osteocytes lack mitotic activity. They can communicate with each other and receive nutrients via long cytoplasmic processes that extend through canaliculi (singular = canaliculus), channels within the bone matrix. If osteoblasts and osteocytes are incapable of mitosis, then how are they replenished when old ones die? The answer lies in the properties of a third category of bone cellsthe osteogenic cell. These osteogenic cells are undifferentiated with high mitotic activity and they are the only bone cells that divide. Immature osteogenic cells are found in the deep layers of the periosteum and the marrow. They differentiate and develop into osteoblasts. The dynamic nature of bone means that new tissue is constantly formed, and old, injured, or unnecessary bone is dissolved for repair or for calcium release. The cell responsible for bone resorption, or breakdown, is the osteoclast. They are found on bone surfaces, are multinucleated, and originate from monocytes and macrophages, two types of white blood cells, not from osteogenic cells. Osteoclasts are continually breaking down old bone while osteoblasts are continually forming new bone. The ongoing balance between osteoblasts and osteoclasts is responsible for the constant but subtle reshaping of bone. Table 6.3 reviews the bone cells, their functions, and locations. Q: What bone cell is responsible for forming new bone and is found in the growing portions of bone, including the periosteum and endosteum? Choices: - epithelial - congenial - fibroblasts - osteoblast A:
A: osteoblast
Question: Answer the following question given this paragraph: Calcium fluoride is used to fluoridate drinking water to promote dental health. Crystalline CaF 2 (d = 3.1805 3. Q: What is used to fluoridate drinking water to promote dental health Choices: - carbon fluoride - calcium fluorine - carbon fluorine - calcium fluoride A:
Answer: calcium fluoride
*Question*
Answer the following question given this paragraph: Some mixtures are homogeneous. This means they have the same composition throughout. An example is salt water in the ocean. Ocean water everywhere is about 3.5 percent salt. Q: Mixtures that have the same composition throughout are known as what kinds of mixtures? Choices: - contiguous - zygomatic - heterogeneous - homogeneous A:
**Answer**
homogeneous
Q: Answer the following question given this paragraph: Q: What carries small pollen grains farther than they otherwise would go? Choices: - humidity - steam - birds - wind A:
A: wind