Quiz%201%20key - BIOLOGY 20A SELF ASSESSMENT QUIZ 1 ANSWER...

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BIOLOGY 20A SELF ASSESSMENT QUIZ 1 ANSWER KEY Take this quiz AFTER you complete your studying for the first two lectures. Try to complete the exam within 45 minutes without looking at your notes or book. Grade your quiz using the key posted on the class web page according to the following scale: A > 90%; B > 80%; C > 65%; D > 50%; F < 50%. Your TA will answer questions about the quiz in section. 1. Which of the following statements is true? a. a polar covalent bond is weaker than an ionic bond b. an ionic bond is stronger than a nonpolar covalent bond c. the existence of nonpolar covalent bonds makes hydrogen bonding possible d. all of the above e. none of the above 2. The four most common elements in cells include: a. carbon, oxygen, hydrogen and silicon b. carbon, oxygen, hydrogen and sulfur c. carbon, oxygen, hydrogen and nitrogen d. carbon, oxygen, nitrogen and calcium e. none of the above 3. Which of the following statements about pH are true? a. The concentration of hydrogen ions in a solution with a pH of 3 is 10 -3 mM b. Acids decrease pH by increasing the concentration of hydrogen ions.
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This note was uploaded on 10/24/2009 for the course BIO bIO taught by Professor Bowman during the Winter '07 term at École Normale Supérieure.

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Quiz%201%20key - BIOLOGY 20A SELF ASSESSMENT QUIZ 1 ANSWER...

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