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Saddleback BIO 20 - Practice Exam 1

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Page 1 of 4 Biology 20 Practice Exam 1 These questions include knowledge, comprehension and application of the material discussed in class. Some questions are more difficult than normal so that you will use your notes and textbook. Do your best. If you have questions, please do not hesitate to ask for assistance (Office SM 254 or email [email protected]). Good luck!!! This is by no means everything that will be on the test. I've tried to put some representative questions on this practice exam for you to work on. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1. What are the basic "building blocks" of DNA? a) four nucleotides b) protein c) 26 nucleotides d) carbohydrates and lipids e) 20 amino acids 2. What is a hypothesis? a) a fact b) a tentative explanation c) an untestable idea d) a verifiable observation e) the same thing as a theory 3. A controlled experiment is one in which a) there are at least two groups, one differing from the other by two or more variables. b) the experiment is repeated many times to ensure that the results are accurate. c) the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data. d) there are at least two groups, one of which does not receive the experimental treatment. e) there is one group for which the scientist controls all variables. 4. Which of these is an example of an organelle? a) digestive system b) amoeba c) muscle d) stomach e) chloroplast 5. Once labor begins in childbirth, contractions increase in intensity and frequency until delivery. Therefore, the increasing labor contractions of childbirth are an example of a) a feedforward mechanism. ) negative feedback. c) positive feedback. d) feedback inhibition. e) both C and D. 6. Species that are in the same __________ are more closely related than species that are only in the same _____. a) class ... order b) phylum ... class c) family ... genus d) kingdom ... phylum e) family ... order 7. Which of these is the best description of the science of biology? a) the study of the way humans interact with their environment b) the study of life c) the study of biodiversity d) the study of humans e) the study of rocks 8. A maple leaf is at which level in the hierarchical organization of life? a) organelle b) organ c) tissue d) organism e) population 9. One of the key distinctions between prokaryotic and eukaryotic cells is the presence of __________ cells, which is lacking in __________ cells. a) DNA in eukaryotic ... prokaryotic b) a nucleus in prokaryotic ... eukaryotic c) a nucleus in eukaryotic ... prokaryotic d) DNA in prokaryotic ... eukaryotic e) a cytoplasmic organelle in prokaryotic ... eukaryotic 10. Which four elements make up approximately 96% of living matter? a) carbon, sulfur, phosphorus, hydrogen b) carbon, oxygen, sulfur, calcium c) oxygen, hydrogen, calcium, sodium d) carbon, sodium, chlorine, magnesium e) carbon, hydrogen, nitrogen, oxygenPage 2 of 4 11. The mass number of an element can be easily approximated by adding together the number of a) protons and neutrons. b) electron orbitals in each energy level. c) isotopes of the atom. d) protons and electrons. e) neutrons and electrons. 12. Oxygen has an atomic number of 8. Therefore, it must have a) 8 protons. b) 8 electrons. c) 16 neutrons. d) Only A and B are correct. e) A, B, and C are correct. 13. How does one refer to an atomic form of an element containing the same number of protons but a different number of neutrons? a) polar atom b) ion c) radioactive d) isomer e) isotope 14. How do isotopes differ from each other? a) number of protons b) ability to form ions c) number of neutrons d) valence electron distribution e) number of electrons 15. Which of the following best describes the relationship between the atoms described below? Atom 1 Atom 2 31 32 P P 15 15 a) They are both radioactive. b) They contain 31 and 32 protons respectively. c) They are both phosphorous cations. d) They are both phosphorous anions. e) They are both isotopes of phosphorous. 16. A covalent chemical bond is one in which a) outer-shell electrons are shared by two atoms so as to satisfactorily fill the outer electron shells of both. b) the inner-shell electrons of one atom are transferred to the outer shell of another atom. c) outer-shell electrons of one atom are transferred to the inner electron shells of another atom. d) protons or neutrons are shared by two atoms so as to satisfy the requirements of both. e) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. 17. What are the maximum number of covalent bonds an element with atomic number 16 can make with hydrogen? a) 4 b) 2 c) 1 d) 5 e) 3 18. The ionic bond of sodium chloride is formed when a) sodium and chlorine share an electron pair. b) sodium gains an electron from chlorine. c) sodium and chlorine both lose electrons from their outer valence shells. d) chlorine gains an electron from sodium. e) chlorine gains a proton from sodium. 19. The partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule. What is this attraction called? a) an ionic bond b) a hydrophilic bond c) a hydrogen bond d) a hydrophobic bond e) a covalent bond 20. Water is transported in plant tissues against gravity due to which of the following properties? a) cohesion b) hydrogen bonding c) adhesion d) two of the above e) all of the above 21. Desert rabbits are adapted to the warm climate because their large ears aid in the removal of heat by a) the buffering capacity of water. b) the high specific heat of water. c) the high heat of vaporization of water. d) the high surface tension of water. e) the dissociation of water molecules. 22. Which of the following solutions has the greatest concentration of hydroxide ions [OH-]? a) seawater at pH 8 b) lemon juice at pH 2 c) vinegar at pH 3 d) urine at pH 6 e) tomato juice at pH 4Page 3 of 4 23.


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