Chapter 2 - Chapter 2: Chemistry Comes Alive 1) The atomic...

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Chapter 2: Chemistry Comes Alive 1) The atomic weight is only an average of relative weights of an atom and its isotopes, and it may vary from the weight of a specific isotope. True 2) Emulsions and colloids are the same thing. True 3) Chemical properties are determined primarily by neutrons. False 4) A charged particle is generally called an ion. True 5) Isotopes differ from each other only in the number of electrons contained. False 6) About 60 to 80% of the volume of most living cells consists of organic compounds. False 7) Lipids are a poor source of stored energy. False 8) Current information theorizes that Omega-3 fatty acids decrease the risk of heart disease. True 9) Glucose is an example of a monosaccharide. True 10) A molecule consisting of one carbon atom and two oxygen atoms is correctly written as CO2. True 11) The lower the pH, the higher the hydrogen ion concentration. True 12) Covalent bonds are generally less stable than ionic bonds. False 13) Hydrogen bonds are comparatively strong bonds. False 14) The fact that no chemical bonding occurs between the components of a mixture is the chief difference between mixtures and compounds. True 15) Alpha particles, although relatively weak energy particles, are second only to smoking as a cause of lung cancer. True 16) No chemical bonding occurs between the components of a mixture. True 17) All organic compounds contain carbon. True 18) A dipeptide can be broken into two amino acids by dehydration synthesis. False 1) Which of the following is necessary for proper conduction of nervous impulses? A) Fe B) I C) P D) Na 2) A phospholipid is usually ________. A) partially polar and partially nonpolar B) completely nonpolar C) completely polar D) neither polar nor nonpolar 3) In general, the category of lipids that we refer to as oils have ________. A) a high water content B) long fatty acid chains C) a high degree of saturated bonds D) a high degree of unsaturated bonds 4) The genetic information is coded in DNA by ________. A) the regular alteration of sugar and phosphate molecules B) the sequence of the nucleotides C) the three-dimensional structure of the double helix D) the arrangement of the histones 5) Which of the following is not true of proteins? A) They may be denatured or coagulated by heat or acidity. B) Some types are called enzymes. C) They appear to be the molecular carriers of the coded hereditary information. D) Their function depends on the three-dimensional shape. 6) The single most abundant protein in the body is ________. A) DNA B) hemoglobin C) collagen D) glucose 7) Carbohydrates are stored in the liver and muscles in the form of ________. A) glucose B) triglycerides C) glycogen D) cholesterol 8) Coenzymes are ________. A) organic molecules derived from vitamins
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This note was uploaded on 07/24/2011 for the course BIO 201 taught by Professor Quintana during the Spring '10 term at TAMU Intl..

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Chapter 2 - Chapter 2: Chemistry Comes Alive 1) The atomic...

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