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2009 ap biology essay answers

Similarly, one of the four essay questions will also be taken from that area; another question will be on Area II (heredity and evolution); and the remaining two questions will be on Area III (organisms and populations). Water’s role as a medium for the metabolic processes of cells (2 points maximum): • Diffusion—allows for movement of materials through an aqueous solution down the concentration gradient • Osmosis—movement of water across membranes due to water potential differences (down the gradient) • Solvent—dissociation/ionization of materials • Buffer—explanation of role water plays in formation of bicarbonate ion © 2009 The College Board. Past Free-Response Questions Below are free-response questions from past AP Biology Exams.

2009 ap biology essay answers

2009 ap biology essay answers

You are not limited to the three properties discussed in part (a): • • • the role of water as a medium for the metabolic processes of cells the ability of water to moderate temperature within living organisms and in organisms’ environments the movement of water from the roots to the leaves of plants (a) Discuss THREE properties of water (6 points maximum): Name of property and correct description (2 points). Property Polarity of water Specific heat/hh heat capacity Hh heat of vaporization Adhesion Cohesion Three states of matter Repels hydrophobic material and Description (2 points jointly) Polar covalent bonds created by unequal sharing of electrons between O and H within the molecule Heat absorption without temperature change Water molecules absorb energy as it changes state/breaking of bonds by absorbing energy Attraction to other molecules that are polar or have charge Attraction to other water molecules due to polar nature of water/ surface tension Ice–liquid–gas (vapor) Kinetic energy differences Expands at 4°C to become less dense Moves aside nonpolar substances (b) Explain each of the following in terms of water properties (6 points maximum; 2 points for each part). About 25 percent of the multiple-choice questions are likely to be on the subject areas listed under Area I (molecules and cells).

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    2009 ap biology essay answers

    2009 ap biology essay answers

    2009 ap biology essay answers

    AP® BIOLOGY 2009 SCORING GUIDELINES (Form B) Question 3 Water is essential to all living things. (b) Explain each of the following in terms of the properties of water. Many schools, for example, require no background in biology to take the course.

    2009 ap biology essay answers

    Exam Content The Topic Outline in the Course and Exam Description provides details about the content on the exam. GLOBAL WARMING EASY ESSAY In answering any of the four free-response questions, students may need to analyze and interpret data or information drawn from lab experience (as well as from lecture material) or to integrate material from different areas of the course.


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