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Free CLEP Science and Mathematics Exam Braindumps (page: 59)

Page 58 of 128
PDF with 494 Questions

Which of the following would NOT be found in an animal with bilateral symmetry?

  1. Dorsal side
  2. Anterior
  3. Posterior
  4. 3 axes of symmetry
  5. Ventral side

Answer(s): D

Explanation:

Something with 3 axes of symmetry can be divided into three parts, each of which looks equivalent.



Which of the following is NOT a neurotransmitter?

  1. Epinephrine
  2. Serotonin
  3. Dopamine
  4. Caffeine
  5. Acetylcholine

Answer(s): D

Explanation:

Caffeine is a stimulant found in coffee.



Allergies occur when

  1. the circulatory system slows down
  2. the immune system launches an inflammatory response
  3. the immune system is not sensitive enough to foreign invaders
  4. the immune system recognizes a bacterium
  5. nerve cells begin to fire rapidly

Answer(s): B

Explanation:

Allergies occur when the immune system launches an inflammatory response to environmental antigens.



In a tryptophan-rich environment, it is noticed the genes that code for proteins important in the bacteria's metabolic production of tryptophan are turned off. The bacteria are not producing tryptophan. In this example, tryptophan

  1. acts via a negative feedback loop
  2. acts via a positive feedback loop
  3. has a cascade effect
  4. has no effect
  5. is an enzyme

Answer(s): A

Explanation:

In this example, tryptophan acts via a negative feedback loop. When tryptophan is present, the cell does not need to produce more of it. The genes that code for the proteins involved in the production of tryptophan are switched off in the presence of tryptophan.






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