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TLS Online TPP Program

#Question id: 1032

A research laboratory is investigating environmental factors that would inhibit the growth of Archaea. One question they have is if adding the antibiotic penicillin would be effective in controlling their growth. What do you think the outcome would be if they tried this?

#Unit 4. Cell Communication and Cell Signaling

  1. The penicillin wouldn't affect the Archaea because it prevents crosslinking of peptidoglycan-Archaea don't have this compound in their cell walls.

  2. The penicillin will inhibit cell wall formation in the Archaea, killing them.

  3. The penicillin will slow down the growth of the Archaea by damaging the cell wall, but they will still be able to grow somewhat.

  4. The penicillin will enhance the growth of the Archaea by providing a rich nutrient source.

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TLS Online TPP Program

#Question id: 12118

#Unit 10. Ecological Principles

According to Hamilton’s rule,
TLS Online TPP Program

#Question id: 9245

#Unit 9. Diversity of Life Forms

One characteristic that distinguishes a population in an extinction vortex from most other populations is that
TLS Online TPP Program

#Question id: 11001

#Unit 7. System Physiology – Animal

In which phase of the ventricular muscle action potential is the potassium permeability the highest?
TLS Online TPP Program

#Question id: 7209

#Unit 5. Developmental Biology

Following statements are related to the Epigenetic regulation of Hox gene expression in the chick limb .

A. Hoxa13 is normally not expressed during early limb bud outgrowth.

B. Hoxa13 is normally expressed during early limb bud outgrowth.

C. Inhibition of histone deacetylases with a TSA-coated bead implanted into the early limb bud results in precocious Hoxa13 expression and specifically reduced skeletal elements of the zeugopod

D. Inhibition of HAT proteins with a TSA-coated bead implanted into the early limb bud results in Hoxa13 expression and specifically reduced skeletal elements of the zeugopod

E. The epigenetic hold on gene Hoxa13 expression to allow the necessary time for zeugopod development.

F. The epigenetic hold on gene Hoxa13 expression to allow the necessary time for autopod development.

Which of the following combinations are correct?
TLS Online TPP Program

#Question id: 990

#Unit 1. Molecules and their Interaction Relevant to Biology

Carbamoyl phosphate synthetase I is located in the ________ in eukaryotes and uses ________ as a nitrogen source.