#Question id: 4709
#Unit 11. Evolution and Behavior
The horizontal axis of the cladogram depicted below is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V-Z) represent various common ancestors. Let's say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.
In Darwin's tree of life, each fork in the tree represents ________.
#Question id: 1578
#Unit 4. Cell Communication and Cell Signaling
Function of TH2
#Question id: 33475
#Unit 2. Cellular Organization
With pulsed-field gel electrophoresis, which can separate DNA molecules up to 107 bp in length. The results of pulsed-field gel electrophoresis of the DNA from the yeast Saccharomyces cerevisiae are shown in Figure. How many chromosomes does S. cerevisiae have?
#Question id: 30088
#Unit 2. Cellular Organization
Which type of transposable element is only found in eukaryotes (not prokaryotes)?
#Question id: 4348
#Unit 3. Fundamental Processes
Under what conditions does the trp repressor block transcription of the trp operon?