If a culture starts with 50 cells, how many cells will be present after five generations with no cell death?

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#Question id: 3892

#3. Fundamental Processes

The DNA binding motif for many prokaryotic regulatory proteins, such as the lac repressor, is:

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#Question id: 927

#1. Molecules and their Interaction Relevant to Biology

In the disease sprue, vitamin B12 (cobalamin) is poorly absorbed in the intestine, resulting in B12 deficiency. If each of the following fatty acids were in the diet, for which one would the process of fatty acid oxidation be most affected in a patient with sprue?

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#Question id: 2653

#2. Cellular Organization

The sequence of the structural genes in the lac operon is

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#Question id: 8925

#9. Diversity of Life Forms

What is the probable sequence in which the following clades of animals originated, from earliest to most recent?

1. tetrapods

2. vertebrates

3. deuterostomes

4. amniotes

5. bilaterians

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#Question id: 4964

#11. Evolution and Behavior

Which of the following statements provides the strongest evidence that prokaryotes evolved before eukaryotes?