A stem cell divides and differentiates into a muscle cell and a brain cell. Which of the following correctly compares the muscle cell and the brain cell?

A. The two cells have the same DNA, but the muscle cell uses different sections of its DNA than the
brain cell.

B. The two cells have the same DNA, and the muscle cell uses the same sections of its DNA as the brain
cell.

c. The two cells have different DNA, and the muscle cell uses different sections of its DNA than the
brain cell.

D. The two cells have different DNA, but the muscle cell uses the same sections of its DNA as the brain
cell.

In a cross between individuals of a species of tropical fish, all of the male offspring have long tail fins, and none of the females possess the trait. mating two of the f1 fish fails to produce females with the trait. explain the inheritance pattern of the trait.

Astudent from one of the research labs is having trouble preparing a slide for examination and photographing. the bacterial slide that he has brought to you was prepared using a commercially purchased stain. he has asked for your in determining what he is doing wrong so that he can change the lab protocols and continue on with his project. after examining the slide under oil immersion, you determine that no bacteria are present even though the student is able to show you the culture he used to make that slide that has visible growth in the liquid medium. which of the following statements does not explain the fact that there are no bacteria present on the student’s slide? by not allowing a glass slide to completely air dry before heat fixation, the flame will cause the surrounding water to boil and this will damage the bacterial cell. overheating during the fixation step boiled the water within the bacterial cells and resulted in the cells bursting. insufficient heating of the slide did not drive out the thin layer of water and this resulted in minimal bonding between the bacteria and the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide.

Do fish feel pain? and if they do what pain