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Free CLEP Science and Mathematics Exam Braindumps (page: 5)

Page 4 of 128
PDF with 494 Questions

Experiments involving the reduction of the blue dye DPIP, which loses its blue color and becomes clear as it absorbs electrons, have shown that the dye shows the greatest loss of color when in the presence of chloroplasts

  1. under bright, white light
  2. in a dark box
  3. that have been boiled before exposure to light
  4. exposed only to green light
  5. in a sugar solution

Answer(s): A

Explanation:

If DPIP is reduced (gains electrons) to lose its color, then the DPIP will show the greatest loss of color wherever the greatest number of electrons are being knocked around. Chlorophyll loses electrons when it is bombarded by photons of light. Thus, only chlo-roplasts in bright, white light will change DPIP greatly. Boiled chloroplasts will be ineffective due to enzyme denaturation, and chloroplasts in the dark or exposed only to green light will absorb few photons if any. Chloroplasts have no direct effect on sugar production; thus being in a sugar solution should not affect this reaction with DPIP in any way.



In humans, carbon dioxide in the bloodstream is mainly transported from cells to lungs

  1. as bicarbonate ion
  2. as carbon dioxide gas bubbles within red blood cells
  3. attached to hemoglobin
  4. as carbonic acid
  5. as carbon dioxide gas bubbles within the plasma

Answer(s): A

Explanation:

Carbon dioxide produced by the body's cells mixes with water in the bloodstream to form carbonic acid, which then dissociates into H+ and HC03- (bicarbonate) ions. The hydrogen ions are complexed to hemoglobin in the red blood cells while the bicarbonate ions generally remain in the plasma during the trip to the lungs.



A newly discovered organism has ribosomes that can be inhibited by the antibiotic streptomycin as well as free-floating DNA not enclosed within a nuclear membrane. This organism is most likely a(n)

  1. virus
  2. plant
  3. fungus
  4. protist
  5. bacterium

Answer(s): E

Explanation:

Bacteria, which are prokaryotes, are classified as such due to their lack of a nuclear membrane housing their DNA. In addition, antibiotics are drugs used to kill bacteria only and do not harm other living organisms or viruses.



In or around the cells of flowering plants, one would expect to find all of the following EXCEPT

  1. cell walls
  2. mitochondria
  3. centrioles
  4. large, central vacuoles
  5. chloroplasts

Answer(s): C

Explanation:

Flowering plants, just like other plants, should be expected to possess chloroplasts, mitochondria, cell walls, and large centralized vacuoles. However, plant cells, unlike animal cells, have no centrioles to act as microtubule organizing centers for cell division.






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