Ques:Answer the following question given this paragraph: Earth is just a tiny speck in the Universe. Our planet is surrounded by lots of space. Light travels across empty space. Light is the visible part of the electromagnetic spectrum . Astronomers use the light and other energy that comes to us to gather information about the Universe. Q: What is the term for the visible part of the electromagnetic spectrum? Choices: - chroma - gravity - electricity - light A:

Ans:light
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Ques:Answer the following question given this paragraph: Wings and feathers are two adaptations for flight that evolved in birds. Both are clearly displayed in the flying gull in Figure below . Wings evolved from the front limbs of a four-legged ancestor. The wings are controlled by large flight muscles in the chest. Feathers also help birds fly. They provide air resistance and lift. In addition, they provide insulation and serve other roles. Q: Birds adapted wings and weathers for flight during what process? Choices: - migration - variation - emergence - evolution A:

Ans:evolution
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Ques:Answer the following question given this paragraph: Digestion of Carbohydrates Carbohydrate digestion begins in the mouth (Figure 20.5 "The Principal Events and Sites of Carbohydrate Digestion"), where salivary -amylase attacks the -glycosidic linkages in starch, the main carbohydrate ingested by humans. Cleavage of the glycosidic linkages produces a mixture of dextrins, maltose, and glucose. (For more information about carbohydrates, see Chapter 16 "Carbohydrates". ) The -amylase mixed into the food remains active as the food passes through the esophagus, but it is rapidly inactivated in the acidic environment of the stomach. Figure 20.5 The Principal Events and Sites of Carbohydrate Digestion. Q: Where does carbohydrate digestion begin in the body? Choices: - stomach - intestines - throat - mouth A:

Ans:mouth
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Ques:Answer the following question given this paragraph: Visit this site (http://openstaxcollege. org/l/fermentation2) to see anaerobic cellular respiration in action. Other fermentation methods occur in bacteria. Many prokaryotes are facultatively anaerobic. This means that they can switch between aerobic respiration and fermentation, depending on the availability of oxygen. Certain prokaryotes, like Clostridia bacteria, are obligate anaerobes. Obligate anaerobes live and grow in the absence of molecular oxygen. Oxygen is a poison to these microorganisms and kills them upon exposure. It should be noted that all forms of fermentation, except lactic acid fermentation, produce gas. The production of particular types of gas is used as an indicator of the fermentation of specific carbohydrates, which plays a role in the laboratory identification of the bacteria. The various methods of fermentation are used by different organisms to ensure an adequate supply of NAD+ for the sixth step in glycolysis. Without these pathways, that step would not occur, and no ATP would be harvested from the breakdown of glucose. Q: Obligate anaerobes live and grow in the absence of what? Choices: - molecular carbon - molecular nitrogen - atomic oxygen - molecular oxygen A:

Ans:
molecular oxygen
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