Chapter 4-Metablisom

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jaceym1994
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44894
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Chapter 4-Metablisom
Updated:
2010-10-25 20:23:09
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anatomy
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Anatomy and Physiology A Chapter 4
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  1. T or F: Enzymes are proteins that promote specific chemical reactions.
    True
  2. T or F: Vitamins are substances that cannot be synthesized in sufficient quantities by human cells.
    True
  3. T or F: Oxidation is a process by which bonds between the atoms of molecules are formed.
    False
  4. T or F: A metabolic pathway is a particular sequence of enzyme-controlled reactions.
    True
  5. T or F: An ATP molecule consists of an adenine, a ribose, and three phosphates.
    True
  6. T or F: During the anaerobic phase of respiration, pyruvic acid is changed to glucose.
    False
  7. The Oxidation that occurs during cellular respiration differs from burning in that respiration:
    A: requires a relatively large amount of energy to start the process.
    B: utilizes enzymes to start the process.
    C. involves a greater release of energy in the forms of heat and light.
    B
  8. Enzymes:
    A. cause activation energy to be lowered.
    B. act to initiate or speed metabolic reactions.
    C. are not changed as a result of the reactions they control.
    D. All of the above.
    D.
  9. If a strand of DNA molecule contained the base sequence C,T,A,G,C, the complementary strand would contain the base sequence:
    G, A, T, C, G
  10. Ketone bodies are produced as a by-product of
    A. carbohydrate metabolism
    B. protein metabolism.
    C. fat metabolism
    C
  11. If a DNA strand has the organic base sequence T T A C G A, the corresponding base sequence of a messenger RNA molecule would be
    A A U G C U
  12. Anabolic metabolism includes:
    A. constructive processes by which substances are synthesized
    B. all processes needed to maintain life.
    C. destructive processes by which substances are decomposed
    D. changes of larger molecules into smaller ones.
    A
  13. The process of copying DNA information into the structure of mRNA is called
    transcription
  14. When ketones are present in excess, a person may develop
    A. alkalosis
    B. acidosis
    C. diabetes mellitus
    D. diabetes insipidus
    B
  15. In dehydration synthesis of a large carb,
    A. larger molecules are decomposed into smaller ones
    B. monosaccharides are joined together
    C. water molecules become joined to monosacchraide molecules
    D. the molecule is decomposed into CO2 and water
    B
  16. A mutation is
    A change in the DNA molecule, which changes the protein that will be formed.
  17. The reactions of anaerobic respiration occur in the
    cytoplasm
  18. Phenylketonuria results from an inability to metabolize
    an amino acid
  19. Which of the following provides the best model to illustrate the way an enzyme interacts with a substrate molecule?
    A. Lock and key
    B. Reflecting light beam
    C. Bouncing Bal
    D. Rolling wheel
    A.
    (this multiple choice question has been scrambled)
  20. A DNA molecule
    consists of two strands, is twisted into a helix, and is composed of nucleotides joined together.
  21. Which of the following is a mutagen?
    A. UV light
    B. X ray
    C. All of the above
    C
  22. The enzyme catalase acts on a substrate
    A. oxygen
    B. hydrogen
    C. hydrogen peroxide
    D. peroxidase
    C
  23. During the process of protein synthesis, amino acids are positioned in the proper sequence by molecules of
    tRNA
  24. DNA replication
    takes place during the interphase of a cell's life cycle, involves the pulling apart of a double-stranded DNA molecule, and results in two DNA molecules, each with one old strand and one new strand of nucleotides.
  25. Which of the following substances increases in amount during cellular respiration?
    A. oxygen
    B. glucose
    C. ATP
    D. glycogen
    C
  26. The transfer of genetic information from the nucleus into the cytoplasm is a function of
    mRNA
  27. When a sucrose molecule is decomposed to yield a glucose molecule and a fructose molecule,
    A. the process involves dehydration synthesis
    B. a water nolecule is released
    C. a water molecule is used.
    C
  28. During the anaerobic phase of respiration, glucose is changed to
    pyruvic acid
  29. The portion of a DNA molecule that contains the information for making one kind of protein is called a
    gene
  30. When proteins undergo digestion, the resulting molecules are
    amino acids
  31. The particular region of an enzyme molecule that combines with the substance it acts upon is called the
    active site
  32. The most common dietary lipids are composed of molecules are called
    triglycerides
  33. A rate-limiting enzyme is usually the _ enzyme in a series.
    first
  34. The substance acted upon by an enzyme is called its
    substrate
  35. In the human body, excess glucose enters anabolic pathways and may be converted into glycogen or
    fat
  36. Before portions of amino acid molecules can enter the cirtic acid cycle, they must undergo
    deanimation
  37. The four organic bases that occur in DNA molecules are adenine, cytosine, guanine, and
    thymine

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