RNA interference is a mechanism of gene regulation in eukaryotes. Arrange the steps by which RNAi carries out gene regulation in the correct order.

1. The siRNA binds to a special protein,

which degrades one strand.

2. One strand of siRNA associates with the

protein to form an RNase complex.

3. The enzyme dicer cleaves dsRNA to form

small interfering RNA (siRNA).

4. The RNase complex binds to a specific

mRNA and degrades it.

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.

Which of these correctly describes the difference between processes that take place in prokaryotic and eukaryotic cells?

What is a difference between systemic and pulmonary circulation? a. systemic circulation carries oxygenated blood to the lungs and pulmonary circulation carries deoxygenated blood to the body. b. systemic circulation carries deoxygenated blood to the lungs and pulmonary circulation carries oxygenated blood to the body. c. systemic circulation carries deoxygenated blood to the body and pulmonary circulation carries oxygenated blood to the lungs. d. systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.