The correct order for molecular chaperone–mediated protein folding is:

I – exchange of ATP for ADP on chaperone

II – chaperone undergoes conformational change, which affects protein folding

III – chaperone binds to exposed hydrophobic residues on unfolded protein

IV – folded protein is released

#Question id: 10891

#Unit 10. Ecological Principles

In a lake ecosystem with three trophic levels - Phytoplankton (P), Zooplankton (Z) and Carnivore (C) is control by bottom-up effects, which of the following observation is incorrect?

#Question id: 2259

#Unit 2. Cellular Organization

Which of the following is not a characteristic of prokaryotes?

#Question id: 9201

#Unit 9. Diversity of Life Forms

Erwin and Scott used an insecticidal fog to knock down insects from the top section of a L. seemannii tree. The researchers identified over 900 species of beetles among the individuals that fell. Erwin also projected that this entire tree from top to bottom is host to about 600 arthropod species that are unique to this tree species and not found on any other tree species. There are approximately 50,000 species of tropical trees. Although it could not be entirely accurate, what would be the best way to estimate the total number of arthropod species?

#Question id: 16493

#Unit 3. Fundamental Processes

#Question id: 5027

#Unit 11. Evolution and Behavior

Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?

1. Protostomes invade terrestrial environments.

2. Cambrian explosion occurs.

3. Deuterostomes invade terrestrial environments.

4. Vertebrates become top predators in the seas.