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Find the resistance of a piece of 6 AWG copper wire that is 450 ft long. Assume a temperature of 20°C.

14. Which of the following are produced during the citric acid cycle? A) a proton gradient B) ATP and NAD+ C) pyruvate, ATP and NADH D) ATP, NADH, and FADH2 E) oxygen

Find the resistance of a piece of 12 AWG aluminum wire that is 550 ft long. Assume a temperature of 20°C.

Which of the following is a hormonal contraceptive drug?

17. If you wanted to install lights to grow plants indoors, the type of light would you want to use is A) visible light, because it has low energy wavelengths. B) infrared, because it has high energy wavelengths. C) gamma rays, because it has high energy wavelengths. D) microwaves, because it has low energy wavelengths. E) ultraviolet, because it has high energy wavelengths.

Type 1 diabetes must be treated with injections of ________________ because the pancreas does not function correctly.

20. A key is placed into a keyhole then turned and the door opens. When considering the components of cell signaling, the action of turning the key would best correspond to A) conformational change in the receptor once bound to the hormone. B) the cell response that occurs when the receptor binds the hormone. C) the binding site of the receptor. D) the concentration of the hormone. E) signal transduction that occurs when the receptor binds the hormone.

26. A bottle of Na in solution and a bottle of Cl in solution are mixed together and the water evaporated. What type of bond will be created between the atoms, and what will be the product? A) carbon bonds; carboxyl groups B) covalent bonds; sodium chlorine C) ionic bonds; table salt D) hydrogen bonds; sodium hydroxide

     The double arrow in this reaction indicates that it is   in equilibrium. Polar hydrogen bonded. hydrophobic 

29. What makes phospholipids good at forming cellular membranes? A) the polar and nonpolar regions create an amphipathic bilayer of phospholipids B) regions of aliphatic and hydrophilic atoms causing an internalization of phosphorous making a bilayer C) the three saturated fatty tails in phospholipids create a semisolid like structure that maintains a cell’s shape D) covalent and ionic bonds between glycerols create a tight seal around the cell