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TLS Online TPP Program

#Question id: 1076

Why are viroids resistant to nucleases?

#Unit 4. Cell Communication and Cell Signaling

  1. Having a circular RNA "genome," they are resistant to the digestion of most exonucleases (that nibble/digest the free ends of RNA or DNA).

  2. Having a circular RNA "genome," with no protein shell, they are resistant to the protein-degrading activities of nucleases.

  3. Nucleases will only digest DNA, not RNA-so viroids are protected.

  4. Viroids have only been identified in plants. Plant nucleases cannot digest RNA.

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TLS Online TPP Program

#Question id: 4562

#Unit 11. Evolution and Behavior

Which stratum should contain the greatest proportion of extinct organisms?
TLS Online TPP Program

#Question id: 12729

#Unit 13. Methods in Biology

When the two antiparallel strands of DNA are held together partly by the weak forces between complementary bases and partly by hydrophobic interaction between adjacent , stacked base pairs termed as_____
TLS Online TPP Program

#Question id: 4199

#Unit 3. Fundamental Processes

The peptide bond is formed by
TLS Online TPP Program

#Question id: 19091

#Unit 4. Cell Communication and Cell Signaling

Fusicoccin stimulates
a) Transient growth in stem
b) Plant hormones
c) Proton extrusion
d) Hyperpolarization of membrane
e) Tumor formation
TLS Online TPP Program

#Question id: 2193

#Unit 2. Cellular Organization

A membrane is examined using freeze-fracture and freeze-etch analysis. The surfaces are shown to have almost no pits or bumps. Which of the following is the most likely source of the membrane?