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Free CLEP Science and Mathematics Exam Braindumps (page: 61)

Page 60 of 128
PDF with 494 Questions

The role of hemoglobin is to carry ____ from the lungs to the tissues and ____ back to the lungs.

  1. oxygen, carbon dioxide
  2. carbon dioxide, oxygen
  3. oxygen, nitrogen dioxide
  4. carbon dioxide, nitrogen dioxide
  5. oxygen, ozone

Answer(s): A

Explanation:

The oxygen in the air inhaled into the lungs is carried by hemoglobin to the tissues. The oxygen is released and the carbon dioxide produced by cellular processes is carried back to the lungs where it is exhaled.



Which of the following systems is responsible for producing antibodies to fight infection?

  1. Circulatory
  2. Nervous
  3. Digestive
  4. Limbic
  5. Immune

Answer(s): E

Explanation:

The immune system produces antibodies to combat foreign invaders such as bacteria and viruses.



Which of the following does NOT act to increase genetic diversity?

  1. Mutations
  2. Crossing over of chromosomes in meiosis
  3. Selective breeding
  4. Sexual reproduction
  5. Random mating

Answer(s): C

Explanation:

Selective breeding, in which certain traits are specifically selected for, acts to decrease genetic diversity.



Darwin's theory of evolution can be described best by

  1. descent without modification
  2. descent with modification
  3. inheritance of acquired traits
  4. random genetic mutations
  5. unlimited natural resources

Answer(s): B

Explanation:

Offspring inherit genes and thus characteristics from their parents. Those offspring with phenotypes best adapted to the environment produce on average a larger number of offspring. In sexual reproduction, offspring are not exact replicas of parents, thus natural evolution can be described as descent with modification.






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