Practice Questions

TLS Online TPP Program

#Question id: 1076

Why are viroids resistant to nucleases?

#Unit 4. Cell Communication and Cell Signaling

Having a circular RNA "genome," they are resistant to the digestion of most exonucleases (that nibble/digest the free ends of RNA or DNA).
Having a circular RNA "genome," with no protein shell, they are resistant to the protein-degrading activities of nucleases.
Nucleases will only digest DNA, not RNA-so viroids are protected.
Viroids have only been identified in plants. Plant nucleases cannot digest RNA.

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TLS Online TPP Program

#Question id: 12138

#Unit 10. Ecological Principles

The oak tree pathogen Phytophthora ramorum has migrated 650 km in ten years. West Nile virus spread from New York State to 46 others states in five years. The difference in the rate of spread is probably related to

TLS Online TPP Program

#Question id: 12139

#Unit 8. Inheritance Biology

If the plant height is 40cm(maximum) and 20cm(minimum) then what will be the height of AaBb , AABb, Aabb plant and what will be the one dominant polygene contribution?

TLS Online TPP Program

#Question id: 12140

#Unit 10. Ecological Principles

In some animal species, social organization involves the establishment of a system of ordered social rank instead of the occupancy of territories. Such a system of ordered social rank is referred to as a __________.

TLS Online TPP Program

#Question id: 12141

#Unit 10. Ecological Principles

The density and spacing of individuals within suitable habitat and the proportions of individuals in each age class comprise a population's __________.

TLS Online TPP Program

#Question id: 12142

#Unit 10. Ecological Principles

Regarding the geographic range of a species, which of the following statements is true?

TLS Online TPP Program

#Question id: 12143

#Unit 10. Ecological Principles

The __________ states that two species cannot coexist indefinitely when the same resource limits both species.