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Biology, 22.06.2019 07:00
Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities
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Biology, 22.06.2019 13:00
Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.
Answers: 3
Biology, 22.06.2019 13:00
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.
Answers: 1
Biology, 22.06.2019 20:10
True or false 5. carrier proteins have the ability to to change shape and physicially move molecules across the cell membrane. 6. in a facilitated diffusion, the concentration of the molecules to be moved across the cell membrane is higher inside the the cell.
Answers: 1
What distinguishes a glacier from other regions that may be covered by snow?
a. a glacier is...
a. a glacier is...
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