exam1_2004

exam1_2004 - MULTIPLE CHOICE. Choose the one alternative...

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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through A) gap junctions. B) intermediate filaments. C) plasmodesmata. D) desmosomes. E) tight junctions. 2) One liter of a solution with a pH of 3 has how many more H + than 1 L of a solution with a pH of 6? A) 10 times more B) 1,000 times more C) 100 times more D) 300 times more E) 3 times more 3) Which of the following ionizes completely in solution and is therefore a strong base? A) HCl B) NH 3 C) NaOH D) NaCl E) H 2 CO 3 4) How does one refer to an atomic form of an element containing the same number of protons but a different number of neutrons? A) isomer B) polar atom C) isotope D) ion E) radioactive 5) Organic chemistry is a science based on the study of A) vital forces interacting with matter. B) functional groups. C) carbon compounds. D) the properties of oxygen. E) water and its interaction with other kinds of molecules. 6) Carbohydrates normally function in animals as A) sites of protein synthesis. B) the functional units of lipids. C) a component of triglycerides. D) energy-storage molecules. E) enzymes in the regulation of metabolic processes. 7) Which four elements make up approximately 96% of living matter? A) carbon, sodium, chlorine, magnesium B) oxygen, hydrogen, calcium, sodium C) carbon, sulfur, phosphorus, hydrogen D) carbon, oxygen, sulfur, calcium E) carbon, hydrogen, nitrogen, oxygen 8) Upon chemical analysis, a particular protein was found to contain 438 amino acids. How many peptide bonds are present in this protein? A) 438 B) 437 C) 876 D) 439 E) 20 9) One of the buffers that contribute to pH stability in human blood is carbonic acid (H 2 CO 3 ). Carbonic acid is a weak acid that when placed in an aqueous solution dissociates into a bicarbonate ion (HCO 3 - ) and a hydrogen ion (H + ). Thus,
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H 2 CO 3 ˙ HCO 3 - + H + If the pH of the blood increases, one would expect: A) an increase in the concentration of HCO 3 - and a decrease in the concentration of H 2 0. B) an increase in the concentration of H 2 CO 3 and a decrease in the concentration of H 2 0. C) a decrease in the concentration of HCO 3 - and an increase in the concentration of both H 2 CO 3 and H 2 O. D) a decrease in the concentration of H 2 CO 3 and an increase in the concentration of H 2 0. E) a decrease in the concentration HCO 3 - and an increase in the concentration of H 2 0. 10) A covalent chemical bond is one in which A) the inner-shell electrons of one atom are transferred to the outer shell of another atom. B) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. C) protons or neutrons are shared by two atoms so as to satisfy the requirements of both.
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This note was uploaded on 11/07/2009 for the course BIO 066.6 taught by Professor Darby during the Spring '09 term at Sierra.

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exam1_2004 - MULTIPLE CHOICE. Choose the one alternative...

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