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Free CLEP Science and Mathematics Exam Braindumps (page: 9)

Page 8 of 128
PDF with 494 Questions

Mammals share all of the following characteristics with other vertebrates EXCEPT

  1. lungs
  2. egg-laying ability
  3. vertebrae
  4. endothermy
  5. mammary glands

Answer(s): E

Explanation:

Only mammals have mammary glands (breasts) for milk production. All other features listed are shared with at least one

other group of vertebrates. All vertebrates from fish to mammals have representative species with lungs; all vertebrate groups have some species that can lay eggs; and, birds share endothermy, or warm-bloodedness, with mammals.



The graph below shows the effectiveness of an enzyme at various temperatures ranging from 0 degrees Celsius to 60 degrees Celsius. What is the best explanation for the behavior of this enzyme at temperatures higher than approximately 40 degrees Celsius?

  1. The heat has caused the enzyme and substrate molecules to move more slowly.
  2. The enzyme cannot get any more oxygen at warmer temperatures and dies.
  3. The enzyme becomes denatured and loses its 3-D structure.
  4. The enzyme becomes more active due to the increased availability of substrate molecules at higher temperatures.
  5. A second enzyme had destroyed the active sites on the enzyme being examined.

Answer(s): C

Explanation:

The best explanation is that heat had caused the denaturation of the enzyme. Enzymes are sensitive to temperature, pH, and certain other conditions. If the conditions become too extreme, enzymes lose their 3-D shapes and cannot function.



Oils, fats, and waxes are included among which of the following classes of organic compounds?

  1. Steroids
  2. Proteins
  3. Lipids
  4. Carbohydrates
  5. Fatty acids

Answer(s): C

Explanation:

These macromolecules are all lipids, a class of organic compounds that contains fats, phospholipids, and steroids. The building blocks (monomers) for some lipids are fatty acids. Therefore, fatty acids may be a component in lipids but lipids such as oils, waxes, and fats are not fatty acids themselves.



Which of the following eukaryotic organelles is correctly linked to its function?

  1. Golgi apparatus, packaging products for export out of the cell
  2. ribosomes, RNA synthesis
  3. lysosomes, protein synthesis
  4. mitochondrion, site of photosynthesis
  5. nucleus, mitotic spindle production

Answer(s): A

Explanation:

Only the Golgi is correctly matched with its function. The Golgi complex (or apparatus) is responsible for adding sugar groups to proteins in order to make sure that the proteins are shipped to the right places, mainly out of the cell. Ribosomes are involved in reading RNA for protein synthesis, not building the RNA; lysosomes are used in intracellular digestion; mitochondria are sites of cellular respiration, not photosynthesis; and, centrioles produce the spindle.






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