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TLS Online TPP Program

#Question id: 4949

What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?

#Unit 11. Evolution and Behavior

  1. DNA is chemically more stable and replicates with fewer errors (mutations) than RNA.

  2. Only DNA can replicate during cell division.

  3. RNA is too involved with translation of proteins and cannot provide multiple functions.

  4. DNA forms the rod-shaped chromosomes necessary for cell division.

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TLS Online TPP Program

#Question id: 12589

#Unit 10. Ecological Principles

Which of these ecosystems has the highest net primary productivity per square meter?
TLS Online TPP Program

#Question id: 12590

#Unit 10. Ecological Principles

Species introduced to new geographic locations
TLS Online TPP Program

#Question id: 12591

#Unit 10. Ecological Principles

A community's actual evapotranspiration is a reflection of
TLS Online TPP Program

#Question id: 13191

#Unit 10. Ecological Principles

Which of the following statements about circadian rhythms is correct?
TLS Online TPP Program

#Question id: 13190

#Unit 10. Ecological Principles

During the evolution of life on Earth, the photosynthetic organisms initially responsible for raising atmospheric oxygen concentrations from less than 1 percent to about 20 percent were
TLS Online TPP Program

#Question id: 13189

#Unit 10. Ecological Principles

The relative abundance of C plant species increases with latitude because of the associated temperature gradient. A study in North America found that at  42°  North,  C3  plants  become more  abundant than  C4  plants. Given  an  increase in  mean global  temperatures by  10°C and no  other changes in  environmental conditions,  the latitude at which C3 plants become more abundant: