Properties of Water. 1. The graph shows the relationship between the rate of enzyme action and ph for three enzymes: pepsin, urease, and trypsin.
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1 Name: ate: 1. The graph shows the relationship between the rate of enzyme action and ph for three enzymes: pepsin, urease, and trypsin. 1. Which of these enzymes function in the most similar ph range?. urease and trypsin. pepsin and urease. trypsin and pepsin 2. The enzyme intestinal protease is most active at a ph of 8.0 and a temperature of 37. The activity of this enzyme would most likely decrease with an increase in the 2.. amount of light. amount of enzyme. amount of substrate. temperature to over The optimal ph for the functioning of the human enzyme intestinal protease is 8. This ph is best described as 3.. slightly basic. very basic. slightly acidic. very acidic page 1
2 4. The rapid decrease in the rate of enzyme action above 40 in the human body is most likely due to 4.. the denaturation of the enzyme. the denaturation of the product. an increase in the substrate concentration. a decrease in the temperature 5. The rate of action of the enzyme protease is affected by 5.. temperature, particle size, and lipase concentration. temperature, ph, and protein concentration. ph, particle size, and amylase concentration. ph, temperature, and carbohydrate concentration 6. Which is a characteristic of an enzyme? 6.. It is an inorganic catalyst.. It is destroyed after each chemical reaction.. It provides energy for any chemical reaction.. It regulates the rate of a specific chemical reaction. 7. Which element is present in living cells and in all organic compounds? 7.. potassium. sulfur. nitrogen. carbon page 2
3 8. The diagram shown is of the lock-and-key concept of enzyme action that occurs in humans and on your knowledge of biology. 8. Which letter represents an enzyme?.. E.. 9. Which term best describes a solution with a ph of 5? 9.. acidic. neutral. basic. colorless 10. Which elements are present in all organic compounds? 10.. hydrogen and oxygen. nitrogen and oxygen. nitrogen and carbon. hydrogen and carbon 11. The structural formula shown represents urea. This structural formula indicates that urea is 11.. an organic compound. an inorganic compound. a carbohydrate. a nucleic acid H O H / 2. N N. / H H page 3
4 12. Water makes up from 50 percent to 90 percent of a living organism. Most of the rest of the mass consists of a variety of carbon-containing compounds. valid conclusion that can be drawn from these statements is that living things are composed of 12.. organic matter, only. inorganic matter, only. both organic and inorganic matter. neither organic nor inorganic matter 13. Which ph indicates a substance that is more acidic than a substance with a ph of 4? Most of the chemical reactions occurring in a living cell depend on the presence of an inorganic compound known as 14.. glycerol. glycogen. maltose. water 15. chemical analysis of organisms from each kingdom shows that living things are primarily composed of the elements 15.. carbon, hydrogen, chlorine, and sulfur. carbon, hydrogen, oxygen, and nitrogen. iron, calcium, hydrogen, and oxygen. chlorine, carbon, calcium, and sulfur page 4
5 16. Which molecule can be classified as organic? Number of toms Element Mol. Mol. Mol. Mol. Hydrogen arbon Nitrogen Oxygen alcium Which compound is inorganic? 17.. glucose ( 6 H 12 O 6 ). carbon dioxide (O 2 ). ethane ( 2 H 6 ). stearic acid ( 18 H 36 O 2 ) 18. In humans, most enzyme-controlled reactions have their greatest reaction rates at a ph value closest to The diagram shown represents the building block of a large molecule known as a 19.. protein. fatty acid. carbohydrate. nucleic acid page 5
6 20. Organic compounds in which molecules are made up of building blocks containing amino groups are classified as 20.. proteins. carbohydrates. lipids. fatty acids 21. Select the compound, chosen from the list below, which is most closely associated with this statement: 21. These molecules are added during the process of hydrolysis and are removed during dehydration synthesis.. arbohydrates. Proteins. Vitamins. Water 22. Which types of compounds are not classified as carbohydrates? 22.. lipids. sugars. starches. polysaccharides 23. Small molecules combine chemically and form large, complex molecules by a process known as 23.. hydrolysis. digestion. synthesis. nutrition page 6
7 24. uring chemical digestion, large food molecules are broken down to smaller food molecules by the process of 24.. synthesis. absorption. hydrolysis. excretion 25. When the end-products of protein hydrolysis enter the cytoplasm of a cell, they may become building blocks for the synthesis of 25.. glycogen. starches. enzymes. lipids 26. Which substances are most commonly used as building blocks in the synthesis of some lipids? 26.. sugars and starches. amino acids and nucleotides. starches and enzymes. glycerol and fatty acids page 7
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