Which part of the lipopolysaccharide molecule is useful for identification of bacteria
a. the lipid A portion
b. the core polysaccharide
c. the O side chain
d. the proteins
e. the phospholipids

  1. Proteins found in the outer membrane of a bacterial cell
    a. allow passage of materials into the cell
    b. provide structural support
    c. have toxic properties
    d. b and c above
    e. all of the above
  2. Compared to capsules, slime layers are generally characterized as being
    a. more loosely attached to the cell surface
    b. more firmly attached to the cell surface
    c. more hydrophilic
    d. less hydrophilic
    e. less likely to be made of carbohydrate
  3. Which of the following is true regarding the lipolysaccharide molecule.
    a. it is comprised of lipid and polysaccharide
    b. the O side chain is the toxic portion
    c. the lipid A portion is the toxic portion
    d. a and c
    e. b and c
  4. Active transport
    a. requires energy
    b. does not require energy
    c. may make use of the proton motive force or ATP as the source of energy
    d. a and c
    e. none of the above apply to active transport
  5. The plasma membrane is important to the cell because
    a. it functions as a permeability barrier
    b. it provides structural support
    c. it is important for energy production
    d. a and b
    e. a and c
  6. Which of the following is/ are correct the movement of water across the cell membrane.
    a. If a cell is in a hypotonic environment, the net flow of water is out of the cell
    b. If a cell is in a hypertonic environment, the net flow of water is out of the cell
    c. aquaporins facilitate the movement of water across the membrane
    d. a and c
    e. b and c
  7. Which of the following is/are correct concerning ATP.
    a. ATP is an important energy carrier
    b. ATP is a nucleotide
    c. ATP is an enzyme
    d. a and b
    e. a and c
  8. The most abundant elements in living cells are
    a. oxygen, carbon, hydrogen, and nitrogen
    b. water, glucose, and sodium
    c. pottasium, sodium, sulfur, and iron
    d. lipids, proteins, and carbohydrates
    e. lipids, proetins, and nucleic acids
  9. Variant forms of the same element that differ in the number of neutrons are called
    a. protons.
    b. molecules
    c. isotopes
    d. orbitals
    e. isomers

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