Part 2: Khan Academy 2. Using the EVR text, the HHMI video in the TED-ED exercise, and the info in Khan Academy on Biodiversity and Natural Selection, develop answers for the following questions:
a) Using the Redwood Trees example (Biodiversity and Natural Selection Khan Academy video), DESCRIBE in your own words how the biodiversity of an ecosystem is a response to environmental factors.
b) SUMMARIZE the three main factors that contribute to biodiversity presented at the end of the video
c) Explain the process of Natural Selection in one of the Khan Academy multiple choice answers using evidence from the narrative and your selected answer

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions, because prokaryotes don't have nuclei.

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.