Answer the following question given this paragraph: The regular, rhythmic contractions of the diaphragm are controlled by the brain stem. It sends nerve impulses to the diaphragm through the autonomic nervous system. The brain stem monitors the level of carbon dioxide in the blood. If the level becomes too high, it "tells" the diaphragm to contract more often. Breathing speeds up, and the excess carbon dioxide is released into the air. The opposite events occur when the level of carbon dioxide in the blood becomes too low. In this way, breathing keeps blood pH within a narrow range. Q: What monitors the level of carbon dioxide in the blood? Choices: - the lungs - the heart - the kidneys - the brain stem A:
the brain stem
(Question)
Answer the following question given this paragraph: The table salt pictured in the Figure below contains two elements that are so reactive they are rarely found alone in nature. Instead, they undergo chemical reactions with other elements and form compounds. Table salt is the compound named sodium chloride (NaCl). It forms when an atom of sodium (Na) gives up an electron and an atom of chlorine (Cl) accepts it. When this happens, sodium becomes a positively charged ion (Na + ), and chlorine becomes a negatively charged ion (Cl - ). The two ions are attracted to each and join a matrix of interlocking sodium and chloride ions, forming a crystal of salt. Q: Another name for table salt is? Choices: - hydrogen chloride - carbon chloride - dioxide chloride - sodium chloride A:
(Answer)
sodium chloride
Ques: Answer the following question given this paragraph: In receptor-mediated endocytosis, as in phagocytosis, clathrin is attached to the cytoplasmic side of the plasma membrane. If uptake of a compound is dependent on receptor-mediated endocytosis and the process is ineffective, the material will not be removed from the tissue fluids or blood. Instead, it will stay in those fluids and increase in concentration. Some human diseases are caused by the failure of receptor-mediated endocytosis. For example, the form of cholesterol termed low-density lipoprotein or LDL (also referred to as "bad" cholesterol) is removed from the blood by receptor-mediated endocytosis. In the human genetic disease familial hypercholesterolemia, the LDL receptors are defective or missing entirely. People with this condition have life-threatening levels of cholesterol in their blood, because their cells cannot clear LDL particles from their blood. Although receptor-mediated endocytosis is designed to bring specific substances that are normally found in the extracellular fluid into the cell, other substances may gain entry into the cell at the same site. Flu viruses, diphtheria, and cholera toxin all have sites that cross-react with normal receptor-binding sites and gain entry into cells. Q: Patients with familial hypercholesterolemia have life-threatening levels of cholesterol because their cells cannot clear what particles from their blood? Choices: - iron (Fe) - oxygen (O) - high - density lipoprotein (hdl) - low-density lipoprotein (ldl) A:
Ans: low-density lipoprotein (ldl)
(Q).
Answer the following question given this paragraph: Q: Bryophyta is the formal taxonomic name for the phylum that consists solely of what? Choices: - trees - grasses - lichens - mosses A:
(A).
mosses
Ques:Answer the following question given this paragraph: Food is chewed evenly during mastication Moisten and lubricate the lining of the mouth and pharynx. Q: Food chewed evenly during mastication moisten and lubricate the lining of the mouth and this? Choices: - esophagus - trachea - larynx - pharynx A:

Ans:pharynx
Ques: Answer the following question given this paragraph: An experiment is a controlled scientific study of specific variables. A variable is a factor that can take on different values. For example, the speed of an object down a ramp might be one variable, and the steepness of the ramp might be another. Q: In a controlled scientific study, what do you call a factor that can take on different values? Choices: - output - input - vector - variable A:
Ans:
variable