1 BIO 100 UNIT 2 PRACTICE TEST NOTE: Do not study from this test! For best results, study your textbook chapter, study guide, labs, and any other required coursework to the point at which you think that you are ready for the proctored exam in the learning center testing room. Then, take this test from beginning to end , without the help of your textbook, study guide, or any other resources. Once you are done with the test, check your answers. Finally, using your textbook, study guide, labs, etc. go back and review information that you missed or did not fully understand. If you follow our advice, you will have a better gauge of how well prepared you are for the proctored exam. Some students get a false sense of security for the real exam, because they “studied” from this test rather than treating it as a true practice test. Don’t bother trying to memorize the answers. The real exam will have different questions with different answers! You need to understand, not memorize. Answer the following questions on a separate sheet of paper . 1. Which of the following does not characterize viruses? a. reproduction b. growth c. composed of cells d. heredity 2. The membrane system within the cell that serves as a modification, sorting, and sending center for cell products is the: a. Golgi apparatus b. nucleus c. cytoskeleton d. endoplasmic reticulum 3. Which of the following describes the composition of a molecule of DNA? a. 1 carboxyl group, 1 amino group, and 1 “R” group (side group) b. 1 glycerol and 3 fatty acids (hydrocarbons) c. one 5 carbon sugar, 1 phosphate group, and 1 nitrogenous base d. a ring of carbons with several hydroxyl groups attached 4. Cholesterol is classified as a: a. carbohydrate. b. protein. c. lipid. d. nucleic acid. 5. In general, what makes one kind of amino acid different from other amino acids? a. the “R” or side group b. the amino group2 c. the carboxyl group d. the peptide bond 6. How are animal cells similar to plant cells? a. both contain chloroplasts b. both contain cell walls c. both contain large central water vacuoles d. both are eukaryotic cells with plasma membranes and many of the same organelles 7. The atomic number refers to the: a. electronegativity of an atom. b. number of protons in an atom. c. number of both protons and neutrons in an atom. d. number of neutrons in an atom. 8. Suppose some table sugar (sucrose) is stirred with a spoon in a glass of water until it fully dissolves. What was the solute? a. the spoon b. the glass c. the sugar d. the water 9. Baking soda has a pH of about 9. Thus, it is: a. neutral b. basic c. acidic d. hydrophobic 10. When two strands of DNA form a double helix: a. Adenine always pairs with Guanine. b. Cytosine always pairs with Thymine. c. Guanine always pairs with Cytosine. d. Adenine always pairs with another Adenine 11. Which feature is found in both prokaryotic and eukaryotic cells? a. mitochondrion b. golgi body c. DNA d. rough endoplasmic reticulum 12. In order to fill its outermost (valence) shell, nitrogen needs to form ______ covalent bond(s)? a. 1 b. 23 c. 3 d. 4 13. Ionic bonds are formed by: a. one atom donating one or more electrons to another atom. b. two or more atoms sharing electrons. c. one atom being highly electronegative and the other not being highly electronegative. d. making single, double, or triple bonds. 14. Which of the following is an example of a monosaccharide? a. glucose b. maltose c. sucrose d. starch 15. Which of the following are hydrophobic? a. proteins b. carbohydrates c. lipids d. nucleic acids 16. Proteins are polymers of: a. amino acids. b. fatty acids. c. nucleotides. d. sugars. 17. Prokaryotes lack all the following EXCEPT a (an): a. cell wall. b. mitochondrion. c. nucleus. d. endoplasmic reticulum. 18. Oxygen in highly electronegative, meaning that it tends to: a. pulls electrons toward itself. b. pull protons toward itself c. repels electrons away from itself. d. repel protons away from itself. 19. Which organelle performs cellular respiration in order to make energy in the form of ATP? a. chloroplast b. Golgi apparatus c. lysosome4 d. mitochondrion 20. Which of the following pairs of molecules can be held to each other by a hydrogen bond? a. two nonpolar molecules b. two polar molecules c. one polar molecule and one nonpolar molecule d. two ions 21. Which of the following would be the most acidic? a. a solution at pH 3 b. a solution at pH 5 c. a solution at pH 7 d. a solution at pH 9 22. Which of the following statements is true? a. Animal cells are categorized as prokaryotic cells. b. Plant cells are categorized as eukaryotic cells. c. Human cells are categorized as prokaryotic cells. d. Bacteria are categorized as eukaryotic cells. 23. Which part of the cell is composed of microtubules and helps move chromosomes around during cell division? a. centriole b. lysosome c. nucleolus d. ribosome 24. In what unit of a eukaryotic cell are ribosomes made? a. central vacuole b. rough endoplasmic reticulum c. nucleolus d. Golgi apparatus 25. Which of the following is a true statement regarding fire? a. it cannot grow and perform metabolism. b. it is not composed of cells. c. it cannot reproduce itself. d. it does not respond to environmental stimuli. 26. Which of the following would be the most basic? a. a solution at pH 6 b. a solution at pH 8 c. a solution at pH 105 d. a solution at pH 12 27. Soda has a pH of about 3. Thus, it is: a. neutral b. basic c. acidic d. hydrophobic 28. Which of the following is a true statement regarding a virus? a. it has no way to grow and perform metabolism. b. it has no way to reproduce itself. c. it has no way to pass on its genes. d. it uses its host cell’s resources. 29. What type of chemical bond involves the sharing of electrons? a. hydrogen bond b. ionic bond c. covalent bond d. valence bond 30. Carbohydrates include: a. amino acids b. phospholipids c. sugars d. enzymes ______________________________________________________________________________ Answers: 1. c 2. a 3. c 4. c 5. a 6. d 7. b 8. c 9. b 10. c 11. c 12. c 13. a 14. a 15. c 16. a 17. a 18. a 19. d 20. b 21. a 22. b 23. a 24. c 25. b 26. d 27. c 28. d 29. c 30.