Extinction is a natural phenomenon. It is estimated that 99% of all species that ever lived are now extinct. Why then do we say that we are now in a biodiversity crisis?

#Question id: 2569

#Unit 2. Cellular Organization

Some botanists argue that the entire plant should be considered as a single unit rather than a composite of many individual cells. Which of the following cellular structures best supports this view?

#Question id: 2570

#Unit 2. Cellular Organization

 How is plant cell cytokinesis different from animal cell cytokinesis?

#Question id: 2571

#Unit 2. Cellular Organization

While examining a rock surface, you have discovered an interesting new organism. Which of the following criteria will allow you to classify the organism as belonging to Bacteria but not Archaea or Eukarya?

#Question id: 2572

#Unit 2. Cellular Organization

If animals had alternation of generations like plants, ________.

#Question id: 2573

#Unit 2. Cellular Organization

Certain unicellular eukaryotes, including diatoms and some yeasts, have mechanisms of nuclear division that may resemble intermediate steps in the evolution of mitosis. Which of the following is a characteristic feature of nuclear division in these organisms?

#Question id: 2574

#Unit 2. Cellular Organization

Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely ________.