Biochem Quiz
___ 1. Molecules used for cellular energy but not lubrication:
a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids.
____ 2. Fats and oils are:
a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids
____ 3. Molecules used to store energy and provide lubrication and insulation:
a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids
____ 4. Molecules that make hair, fingernails, turtle shells:
a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids
____ 5. What are the monomers of proteins?
a) nucleotides, b) amino acids, c) sugars, d) lipids.
____ 6. Enzymes are which type of molecule?
a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids
____ 7. DNA is an example of which kind of molecule?
a) amino acids, b) proteins, c) carbohydrates, d) lipids, e) nucleic acids,
____ 8. 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.
____ 9. Which is a combination of substances where they do not change form?
a) solution, b) mixture, c) chemical reaction.
____ 10. Dynamic equilibrium causes molecules to move from a high concentration to a
low concentration.
a) true, b) false.
____ 11. 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.
____ 12. 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.
____ 13. 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.
____ 14. Carbohydrates that can’t be broken down into smaller molecules are:
a) starches, b) polysaccharides, c) monosaccharides, d) disaccharides.
____ 15. An example of a polysaccharide is:
a) starch, b) glucose, c) peroxidase, d) fructose, e) lysine
____ 16. Which if the following may be polymers:
a) nucleic acids, b) proteins, c) carbohydrates, d) all of these, e) none of these.
____ 17. Which of these is a solution?
a) ice, b) sugar, c) water, d) coffee, e) paper.
____ 18. A substance with a pH of 12 is very acidic.
a) true, b) false.
____ 19. Pure water has a neutral pH of 5.
a) true, b) false.
____ 20. If you want to decrease the pH of a solution you should add acid.
a) true, b) false.
____ 21. Organisms are composed of only carbon, hydrogen, oxygen, and nitrogen.
a) true, b) false.
____ 22. Proteins provide energy for cells.
a) true, b) false.
____ 23. The monomers that make up nucleic acids are:
a) sugars, b) amino acids, c) fatty acids & glycerol, d) nucleotides, e) none of these.
____ 24. The monomers that make up carbohydrates are:
a) sugars, b) amino acids, c) fatty acids & glycerol, d) nucleotides, e) none of these.
____ 25. The monomers that make up lipids are:
a) sugars, b) amino acids, c) fatty acids & glycerol, d) nucleotides, e) none of these.
____ 26. The monomers that make proteins are:
a) sugars, b) amino acids, c) fatty acids & glycerol, d) nucleotides, e) none of these.
Identify the molecular structures below.
____ 27.
a) amino acid
c) nucleic acid
b) starch
d) lipid
e) nucleotide
____ 28.
a) amino acid
c) nucleic acid
b) starch
d) lipid
e) nucleotide
____ 29.
a) amino acid
b) starch
c) nucleic acid
d) lipid
e) nucleotide
____ 30.
a) amino acid b) starch c) nucleic acid d) lipid e) nucleotide
____ 31. 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. 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. 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. What kind of chemical reaction is shown?
a) precipitation reaction, b) dynamic equilibrium, c) carbohydrate digestion, d) condensation
reaction, e) none of these.
____ 35. 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.