Cells can influence each other's development by a process known as __________.

Some humans have genes that make them resistant to infection by HIV. Would human populations likely evolve differently in areas of the world where HIV infection rates are high? Explain your logic.

Type I diabetes is a form of diabetes that is due to the loss of insulin-producing cells of the pancreas. The potential of stem cells—in particular, induced pluripotent stem (iPS) cells—for therapy has gotten a lot of press.What are iPS cells?a. cells taken from early human embryosb. cells taken from the pancreas of people without diabetesc. cells derived by de-differentiating specialized adult cellsd. cells derived by differentiating pancreas precursor cells

Type I diabetes is a form of diabetes that is due to the loss of insulin-producing cells of the pancreas. The potential of stem cells—in particular, induced pluripotent stem (iPS) cells—for therapy has gotten a lot of press.If researchers were attempting to stimulate the differentiation of iPS cells, which of the following would they most likely add to the cell-culture medium (the liquid surrounding the cells)?a. activin A, an extracellular signal proteinb. Sox-2, a transcription factor active in early developmentc. Grb-2, an intracellular signal transduction proteind. lactase, an enzyme that catalyzes the breakdown of lactose

Cytoplasmic determinants __________.

Instead of developing a head and a tail, an abnormal Drosophila embryo develops two tails. This is most likely due to __________.

Cell differentiation is first observable when __________.

During the process of differentiation, cells __________.

__________ can give rise to any type of cell whereas __________ can give rise to a subset of cell types.