BIO 101 - Exam 1 (chapters 1-4) Questions 100% Answered!!

the polar nature of water molecules -ANSWER The fact that salt dissolves in water is BEST explained by It can absorb a lot of energy without changing temperature -ANSWER What is meant by saying water has a high specific heat? detect brain tumors -ANSWER Radioactive isotopes are useful biological tools that are often used to has equal concentration of H+ and OH- ions -ANSWER If a substance measures 7 (neutral) on the pH scale, that substance False -ANSWER Isotopes are atoms of the same element that vary in the number of protons. True or False? The bond between O of one water molecule and H of a second water molecule -ANSWER Which of the following is an example of hydrogen bonding? liquid water -ANSWER Which of the following is the most dense? nonpolar covalent bond -ANSWER Which of the following would be least affected by the presence of water? Antioxidants stop the chain reaction of cellular damage caused by free radicals -ANSWER Scientists now recommend a diet rich in antioxidants to stay healthy. What occurs at the atomic level to explain the reasoning behind this recommendation? surface tension of water -ANSWER Your friend does a belly flop into the pool. The stinging pain he feels is most likely due to the False -ANSWER Water molecules are held together by ionic bonds.True or False? hydrogen bond -ANSWER Which of the following best explains the attraction of water molecules to each other? 2 -ANSWER If sulfur has an atomic number of 16, how many covalent bonds does it form? You burn your finger and pull your hand away from the very hot handle -ANSWER The specific heat of water is ten times greater than that of iron. You place a metal pot full of water on the stove to heat it up. You touch the metal handle of the pot when the water is still only lukewarm. Which of the following BEST describes what will happen? A and C -ANSWER Hydrophilic molecules gain or loss of electrons -ANSWER How does one explain the formation of ions? water takes up a great deal of heat in ch