1. The simplest chemical units of matter is
  2. A molecule is smaller than an atom. True or False?
    False. Atom is the smallest stable unit of matter. Two or more elements make a molecule.
  3. Isotopes of an element differ in the number of
    neutrons in the nucleus
  4. The atomic number represents the number of
    protons in an atom
  5. The mass number of an atom indicates the number of
    protons and neutrons in the nucleus.
  6. Radioisotopes have unstable
  7. The chemical behavior of an atom is determined by
    the number and arrangement of electrons
  8. Ions with a positive charge are called
  9. In living cells, the weakest bond between two or more atoms is the ________ bond.
  10. Ionic bonds are formed when
    electrons are completely transferred from one atom to another
  11. In a molecule of nitrogen, three pairs of electrons are shared by two nitrogen atoms. The type of bond that is formed would be an example of a(n)
    triple covalent bond.
  12. If a pair of electrons is unequally shared between two atoms, a(n) ________ occurs.
    polar covalent bond
  13. Elements that have atoms with full outer shells of electrons
    are inert
  14. All of the following are true concerning enzymes, except that they
    become a part of the reaction's product
  15. Substrate molecules bind to enzymes at the ________ sites.
  16. Each of the following is an example of an inorganic compound, except
    Water, Acids, Bases, Salts, Glucose.
    Glucose. It contains Carbon, Hydrogen and Oxygen.
  17. A solution containing equal numbers of hydrogen ions and hydroxide ions is
  18. Which of the following substances would be least acidic?
    lemon juice, pH = 2
    urine, pH = 6
    tomato juice, pH = 4
    white wine, pH = 3
    stomach secretions, pH = 1
    urine, pH = 6
  19. If a substance has a pH that is greater than 7, it is
  20. An important buffer in body fluids is
  21. Inorganic compounds that are soluble and whose ions will conduct an electrical current are called
  22. Carbohydrate molecules

    E) contain the genetic information found in cells.
    A) are the body's most readily available source of energy
  23. The most important metabolic fuel molecule in the body is
  24. Molecules that have the same molecular formula but different structural formulas are called
  25. A polysaccharide that is formed in liver and muscle cells to store glucose is
  26. The group of organic compounds containing carbon, hydrogen, and oxygen in a near 1:2:1 ratio is defined as a
  27. A fatty acid that contains three double covalent bonds in its carbon chain is said to be
  28. Most of the fat found in the human body is in the form of
  29. Cholesterol, phospholipids, and glycolipids are examples of
    dietary fats
  30. You would expect a peptide bond to link
    two amino acids.
  31. Each amino acid differs from another in the
    nature of the R group
  32. Glycoproteins and proteoglycans are combinations of proteins and
  33. Molecules that store and process genetic information are the
    nucleic acids
  34. Nucleic acids are composed of units called
  35. A nucleotide consists of
    a five-carbon sugar, a nitrogenous base, and a phosphate group
  36. According to the rules of complementary base pairing, a nucleotide
    containing the base cytosine would pair with a nucleotide containing the
  37. The most important high-energy compound in cells is
    adenosine triphosphate (ATP)
  38. When atoms complete their outer electron shell by sharing electrons, they form
    covalent bonds
  39. Carbohydrates, lipids, and proteins are classified as
    organic molecules
  40. If an isotope of oxygen has 8 protons, 10 neutrons, and 8 electrons, its mass number is
  41. Which has the greater concentration of hydrogen ions, a substance with a pH of 5 or a substance with a pH of 4?
    A pH of 4 is greater
Card Set
Chapter 2