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TLS Online TPP Program

#Question id: 1435

Direct-acting carcinogens are those that:

#Unit 4. Cell Communication and Cell Signaling

  1. chemically react with nitrogen and phosphorous atoms in DNA.

  2. work in conjunction with cytochrome P-450 in the endoplasmic reticulum.

  3. are mainly reactive electrophiles.

  4. generally unreactive, often water-insoluble compounds that can act as potent cancer inducers only after the introduction of electrophilic centers.

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TLS Online TPP Program

#Question id: 927

#Unit 1. Molecules and their Interaction Relevant to Biology

In the disease sprue, vitamin B12 (cobalamin) is poorly absorbed in the intestine, resulting in B12 deficiency. If each of the following fatty acids were in the diet, for which one would the process of fatty acid oxidation be most affected in a patient with sprue?
TLS Online TPP Program

#Question id: 12435

#Unit 10. Ecological Principles

A diagram of a food web, for the following questions. (Arrows represent energy flow and letters represent species.)

In general, the total biomass in a terrestrial ecosystem will be greatest for which trophic level? 
TLS Online TPP Program

#Question id: 14781

#Unit 13. Methods in Biology

A pack of cards contains 4 aces, 4 queens and 4 jacks. Two cards are drawn at random. The probability that at least one of them is an ace is
TLS Online TPP Program

#Question id: 1455

#Unit 4. Cell Communication and Cell Signaling

MicroRNAs are a new class of oncogenic factors because they function:
TLS Online TPP Program

#Question id: 11871

#General Aptitude

The bells begin to toll together and they toll respectively at intervals of 6, 7, 8, 9 and 12 seconds. After how many seconds will they toll together again?