Scientists have engineered bacteria to produce human proteins such as insulin to treat diabetes suppose the unmodified eukaryotic gene coding for insulin is inserted directly into a bacterial chromosome. select the reasons why no expression would be seen in the bacterial cell for the insulin gene.
a. the bacterial rna polymerase will not bind to the eukaryotic promoter sequence.
b. the gene will induce attenuation in the bacterial cell, which will cause a delay in the transcription and translation of the insulin gene.
c. the bacterial nucleoid does not have the proper proteins to transcribe the eukaryotic gene.
d. bacteria cannot remove intronic sequence from a gene, so if the gene for insulin were transcribed, it would translate to a nonfunctional protein.

The dna in a cell’s nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell. for example, consider these two proteins: phosphofructokinase (pfk) is an enzyme that functions in the cytoplasm during glycolysis. insulin, a protein that regulates blood sugar levels, is secreted from specialized pancreatic cells. assume that you can track the cellular locations of these two proteins from the time that translation is complete until the proteins reach their final destinations. for each protein, identify its targeting pathway: the sequence of cellular locations in which the protein is found from when translation is complete until it reaches its final (functional) destination. (note that if an organelle is listed in a pathway, the location implied is inside the organelle, not in the membrane that surrounds the organelle.)

Sally and sue were investigating the topic of friction in science. they used a small car and a ramp as seen in the picture to test what they were learning. they knew that they slipped easily on waxed floors but not on carpet, so they decided to change the material on the surface of the ramp to see what happened. they planned to use glass, carpet, aluminum foil, and sandpaper and run the car down the ramp over each surface. what would be the best research question to guide the girls' experiment? a) does the amount of surface area affect the friction on the moving car? b) will the car travel fastest on the glass surface? c) how does the angle of the ramp affect the speed of the car? d)do rougher surfaces tend to create more friction than smooth surfaces?

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?