Ques:Answer the following question given this paragraph: Figure 46.15 Carbon dioxide gas exists in the atmosphere and is dissolved in water. Photosynthesis converts carbon dioxide gas to organic carbon, and respiration cycles the organic carbon back into carbon dioxide gas. Long-term storage of organic carbon occurs when matter from living organisms is buried deep underground and becomes fossilized. Volcanic activity and, more recently, human emissions, bring this stored carbon back into the carbon cycle. (credit: modification of work by John M. Evans and Howard Perlman, USGS). Q: Respiration cycles the organic carbon into which gas? Choices: - liquid dioxide - phosphorus dioxide - oxygen - carbon dioxide A:

Ans:carbon dioxide
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Ques:Answer the following question given this paragraph: Tight junctions are composed of strands of transmembrane proteins embedded in the plasma membranes of two adjacent cells. The extracellular domains of these proteins directly join to one another. These joining proteins associate with peripheral membrane proteins located on the intracellular side of plasma membrane. These peripheral proteins anchor the strands to the actin component of the cytoskeleton, effectively forming a molecular complex that joins together the cytoskeletons of adjacent cells. The major types anchoring proteins of tight junctions are the claudins and the occludins. Q: What are the major types anchoring proteins? Choices: - semimetals and occludins - amino and fatty acids - claudins and semimetals - claudins and occludins A:

Ans:claudins and occludins
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Ques:Answer the following question given this paragraph: Amphibians have a relatively complex circulatory system with a three-chambered heart. Their nervous system is also rather complex, allowing them to interact with each other and their environment. Amphibians have sense organs to smell and taste chemicals. Other sense organs include eyes and ears. Of all amphibians, frogs generally have the best vision and hearing. Frogs also have a larynx , or voice box, to make sounds. Q: How many chambers does an amphibian heart have? Choices: - four - two - one - three A:

Ans:three
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Ques:Answer the following question given this paragraph: Carbon dioxide emissions into the atmosphere from fossil fuel burning have been rising for the past several decades. Q: Emissions of what gas into the atmosphere from fossil fuel burning have been rising for the past several decades? Choices: - sulphur - oxygen - neon - carbon dioxide A:

Ans:
carbon dioxide
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