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TLS Online TPP Program

#Question id: 788

Which of the following is true about Z-DNA helix?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. It has alternating GC sequences

  2. It is a permanent conformation of DNA

  3. It tends to be found at the 3’ end of the genes

  4. It has fewer base pairs per turn than B-DNA

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TLS Online TPP Program

#Question id: 28680

#Unit 2. Cellular Organization

Mitotic spindle attach to chromosomes via specialized protein structures known as
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: 12537

#Unit 10. Ecological Principles

In terms of nutrient cycling, why does timber harvesting in a temperate forest cause less ecological devastation than timber harvesting in tropical rain forests?
TLS Online TPP Program

#Question id: 15716

#Unit 11. Evolution and Behavior

Evolutionary biology extends and amplifies the explanation of biological phenomena. It complements studies of the proximate causes (immediate, mechanical causes) of biological phenomena If we ask what causes a male bird to sing, the proximate causes include the action of testosterone or other hormones
TLS Online TPP Program

#Question id: 7699

#Unit 9. Diversity of Life Forms

In the phylogenetic trees, numbers represent species, and the same species are shown in both trees. Which two species are represented as sister species in Tree 2 but are not shown as sister species in Tree 1?