When a cell uses chemical energy to perform work, it uses the energy released fr

Question

When a cell uses chemical energy to perform work, it uses the energy released from a/an _____ reaction to drive a/an _____ reaction. A) exergonic; endergonic B) exergonic; spontaneous C) endergonic; exergonic D) spontaneous; exergonic White blood cells (WBCs) are more resistant to lysis than red blood cells (RBCs). When looking at sample of blood for WBCs, what could you do to reduce interference from RBCs? A) Mix the blood in a hypertonic solution, which will cause the RBCs to lyse. B) Mix the blood in a salty solution to cause the RBCs to lyse. C) Mix the blood in an isotonic solution and allow the WBCs to float to the top. D) Mix the blood in a hypotonic solution, which will cause the RBCs to lyse. Which of the following statements regarding the oxygen atom of a water molecule is true? A) Oxygen is more positively charged than the hydrogen atoms. B) Oxygen is more electronegative than the hydrogen atoms. C) Oxygen is attracted to the negatively charged atoms of other molecules. D) Oxygen attracts electrons less strongly than the hydrogen atoms. Household ammonia has a pH of 12 household bleach has a pH of 13. Which of the following statements about these substances is true? A) The ammonia has 10 times as many OH^- ions as the bleach. B) The ammonia has 10 times as many H+ ions as the bleach. C) Both of these substances are strong acids. D) A solution that could buffer the bleach and ammonia would remove excess OH^- ions. A solution with a pH of 7 is A) weakly basic. B) strongly acidic. C) weakly acidic. D) neutral. In plants, the process of photosynthesis produces glucose (C_6H_12O_6) and oxygen from carbon dioxide and water. Which of the following statements about photosynthesis is true? A) More carbon dioxide is released from the plant than is absorbed. B) More atoms are present at the beginning than at the end. C) Water is synthesized by the plant from H_2 and O_2. D) All of the carbon atoms from the carbon dioxide atoms are found in glucose. Myosin is a contractile protein found in muscles that is composed of three pairs of subunits, two heavy chains, and two pairs of two different types of light chains, for a total of six subunits. Myosin contains what level (s) of protein structure? A) primary B) primary and secondary C) primary, secondary, and tertiary D) primary, secondary, tertiary, and quaternary You identify a molecule in a pizza that is a polymer; has oxygen, hydrogen, and sulfur atoms; and is hydrophilic. What kind of molecule is it?

Explanation / Answer

Answer:

30. (A) exergonic, endergonic

31. (D) Mix the blood in a hypotonic solution, which will cause the RBCs to lyse.

32. (B) Oxygen is more electronegative than the hydrogen atoms

33. (B) The ammonia has 10 times as many H+ ions as the bleach.

34. (D) Neutral

35. (D) All of the carbon atoms from the carbon dioxide atoms are found in glucose.

36. (D) primary,secondary, tertiary, quaternary

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