Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 1345
TLS Online TPP Program

#Question id: 1370

H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together. He exposed two species of differently pigmented sponges to a chemical that disrupted intercellular junctions, and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species.

How do you explain the results of Wilson's experiments?

#Unit 4. Cell Communication and Cell Signaling

  1. The two species of sponge had different enzymes that functioned in the reassembly process.

  2. The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment.

  3. The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge.

  4. One cell functioned as an organizer for each organism, thereby attracting only cells of the same species.

More Questions
TLS Online TPP Program

#Question id: 3295

#Unit 11. Evolution and Behavior

Males of different species of the fruit fly Drosophila that live in the same parts of the Hawaiian Islands have different elaborate courtship rituals. These rituals involve fighting other males and making stylized movements that attract females. What type of reproductive isolation does this represent?
TLS Online TPP Program

#Question id: 15250

#Unit 2. Cellular Organization

Osmotolerant microorganisms can survive at extreme osmotic pressure because
TLS Online TPP Program

#Question id: 24563

#Unit 4. Cell Communication and Cell Signaling

Which of the following is NOT true for classical pathway of  complement activation?
TLS Online TPP Program

#Question id: 2162

#Unit 2. Cellular Organization

Uniport transport
TLS Online TPP Program

#Question id: 12653

#Unit 6. System Physiology – Plant

In tobacco, virus-induced gene silencing of the genes for which type of  kinases that are the members of the MAPK family, which are involved in the regulation of antiherbivore defenses?