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Practice_Exam_1_Key_F08

Practice_Exam_1_Key_F08 - Biology 100 Fall 2008 PRACTICE...

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Page 1 of 4 Biology 100 McClenaghan Fall 2008 PRACTICE EXAM 1 KEY Correct answers are in BOLD below. 1. “Genetic changes in populations over time” is the definition of _____________. a. taxonomy b. physiology c. mutation d. evolution e. ecology 2. When atoms of the same kind bond together, the result is called a (an) “___________.” a. element b. compound c. polar molecule d. ion e. peptide 3. In animals, excess monosaccharides are stored as a polysaccharide called ________. 4. A double membrane surrounds what eukaryotic cell organelle? 5. Cells nearly always have lower concentrations of oxygen (O 2 ) inside them compared to the surrounding environment. As a result, O 2 enters cells via _____________. 6. Asphyxiation results when oxygen is withheld from human cells. In biochemical terms, ATP production is largely halted because a lack of oxygen prevents _____________ from occurring. a. glycolysis b. the Calvin cycle c. oxidative phosphorylation d. the Krebs cycle e. lactic acid fermentation 7. In photosynthesis, what molecule is oxidized? 8. In terms of the biological hierarchy, we humans are “organisms.” This means we are composed of members of the next lowest level in the hierarchy, _________________. 9. Organisms must maintain a relatively constant internal pH. Protein molecules called “_________” aid in this process by picking or releasing H+ ions in response to changes in pH. 10. Ribose is a 5-carbon sugar that is an important component of the subunits that makeup nucleic acids. Given this information, you would conclude that ribose is a _____________. a. polysaccharide b. lipid c. disaccharide d. monosaccharide e. steroid
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