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Biochemistry Practice Test

/21. Molecules used for cellular energy but not lubrication: a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids. /22. Fats and oils are: a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids /23. Molecules used to store energy and provide lubrication and insulation: a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids /24. Molecules that make hair, fingernails, turtle shells: a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids

/25. What are the monomers of proteins /25. What are the monomers of proteins? a) nucleotides, b) amino acids, c) sugars, d) lipids. /26. Enzymes are which type of molecule? a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids /1. DNA is an example of which kind of molecule? a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids, /2. What is the job of an enzyme? a) produce proteins, b) provide cellular energy, c) identify cells as self or not, d) speed up chemical reactions.

/3. Which is a combination of substances where they do not change form /3. Which is a combination of substances where they do not change form? a) solution, b) mixture. /4. Dynamic equilibrium causes molecules to move from a high concentration to a low concentration. a) true, b) false.

11./5. Jon was doing an experiment to see which organic molecules are in the parts of a hamburger. Unfortunately the labels fell off of his test tubes. Test tube #1 tested positive for lipids and proteins. Which of the following was probably in test tube #1? a) bun (bread), b) lettuce, c) tomato, d) meat.

/6. Use the same story as in the previous question /6. Use the same story as in the previous question. Jon finds that the substance in test tube #2 tested positive for only carbohydrates. Which of the following was probably in test tube #2? a) bun (bread), b) lettuce, c) tomato, d) meat.

/7. An example of a nucleic acid is: a) DNA, b) RNA, c) glucose, d) a and b are correct, e) c and d are correct. /8. Carbohydrates that can’t be broken down into smaller molecules are: a) starches, b) polysaccharides, c) monosaccharides, d) disaccharides. /9. An example of a polysaccharide is: a) starch, b) glucose, c) peroxidase, d) fructose, e) lysine

/10. Which if the following may be polymers: a) nucleic acids, b) proteins, c) carbohydrates, d) all of these, e) none of these. /11. Which of these is a solution? a) ice, b) sugar, c) water, d) coffee, e) paper. /12. A substance with a pH of 12 is very acidic. a) true, b) false. /13. Pure water has a neutral pH of 5. a) true, b) false. /14. If you want to decrease the pH of a solution you should add acid. a) true, b) false.

/15. Organisms are composed only of carbon, nitrogen, oxygen, and hydrogen. a) true, b) false. /16. Proteins provide energy for cells. a) true, b) false. /17. The monomers that make up nucleic acids are: a) sugars, b) amino acids, c) fatty acids & glycerol, d) nucleotides, e) none of these. 24. /18. The monomers that make up carbohydrates are: a) sugars, b) amino acids, c) fatty acids & glycerol, d) nucleotides, e) none of these.

/19.The monomers that make up lipids are: a) sugars, b) amino acids, c) fatty acids & glycerol, d) nucleotides, e) none of these /20. The monomers that make proteins are: a) sugars, b) amino acids, c) fatty acids & glycerol, d) nucleotides, e) none of these.

27. Version A a) amino acid b) starch c) nucleic acid d) lipid e) nucleotide Version B a) starch b) amino acid c) nucleotide d) nucleic acid e) lipid

Version B a) starch b) amino acid c) nucleotide d) nucleic acid e) lipid 28. Version A a) amino acid b) starch c) nucleic acid d) lipid e) nucleotide

Version B a) starch b) amino acid c) nucleotide d) nucleic acid e) lipid 29.Verion A a) amino acid b) starch c) nucleic acid d) lipid e) nucleotide

Version B a) starch b) amino acid c) nucleotide d) nucleic acid e) lipid e) nucleotide 30. Version A a) amino acid b) starch c) nucleic acid d) lipid e) nucleotide

31. /35. The following data was collected by a scientist: water apple potato milk shake Test for lipids _ + Test for sugar Test for starch Test for protein Unknown C tested positive for starch only. It was probably: a) apple, b) cheese, c) potato, d) milk shake.

Use the picture below to answer the following questions. 32. /31. On which side of the membrane is the concentration of large molecules lower? a) the right side, b) the left side, c) the concentrations are equal. 33./32. Which way will the large molecules move? a) to the right side, b) to the left side, c) they will not move.

Use the diagram below to answer the following questions. 34./33. What kind of chemical reaction is shown? a) precipitation reaction, b) dynamic equilibrium, c) carbohydrate digestion, d) condensation reaction, e) none of these. 35./34. What is the main purpose of this reaction? a) to produce water, b) to make carbohydrates, c) to produce nucleotides, d) to break apart sugar to release energy, e) all of these.

A = 32-35 B = 28-31 C = 25-27 D = 21-24 F = 0-20

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