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TLS Online TPP Program

#Question id: 11484

Two students studying physiology taste a known "bitter" substance, and both report sensing bitterness. They then sample another substance. Student A reports sensing both a bitter taste and a salty taste, but student B reports only a salty taste. What is the most logical explanation?

#7. System Physiology – Animal
  1. Student A had an allergic reaction to the food, causing him to perceive the food as being bitter.
  2. Student A has normal "bitter" taste buds; student B has defective "bitter" taste buds that result in lower sensitivity to bitterness.

  3. Student A has a protein receptor capable of detecting a bitter molecule found in that substance, whereas student B lacks that particular protein receptor.

  4. Student A has normal saliva, whereas student B's saliva is more alkaline than normal.
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TLS Online TPP Program

#Question id: 5210

#11. Evolution and Behavior

Which of the following is a representation of gene density?
TLS Online TPP Program

#Question id: 20540

#12. Applied Biology

Toluene, ethylbenzene and xylene must be kept to ________levels in drinking and recreational waters due to their toxicity
TLS Online TPP Program

#Question id: 768

#1. Molecules and their Interaction Relevant to Biology

MicroRNAs are important gene regulators, but the miRNAs are also regulated in turn by other RNAs. Which, if any, of the following classes of RNA are not known to contain RNAs that regulate miRNAs?
TLS Online TPP Program

#Question id: 5707

#8. Inheritance Biology

Which of the following statement is correct for human is heterozygous for inversion?
TLS Online TPP Program

#Question id: 12372

#10. Ecological Principles

In a particular case of secondary succession, three species of wild grass all invaded a field. By the second season, a  single species dominated the field. A possible factor in this secondary succession was