ap biology lab 1 osmosis and diffusion answers
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Answers:1.Explain how mitosis leads to two daughter cells, each of which is diploid and genetically identical to the original cell. What activities are going on in the cell during interphase? During the interphase stage of mitosis, which is the first thing that happens in the process of mitosis, the chromosomes go through a process in which they synthesis (to make or copy) and make an identical copy of themselves. These copies are fused together by the centromere and are called sister chromatids (identical to each other). During mitosis, the centromere is also replicated. After this happens, the two copies split. Then the cell splits into two daughter cells. Each cell now has an identical copy of the original cell s chromosomes. These are G1 phase, S phase, and G2 phase, and usually lasts 90% of the cell-cycle. 2.How does mitosis differ in plant and animal calls? How does plant mitosis accommodate a rigid, inflexible cell wall? In animal cells, during telophase a contractile ring of actin microfilaments contract at the old metaphase plate creating a cleavage furrow, this is to accomplish cytokenisis which then divides the cytoplasm. In plants this does not occur, instead vesicles are pinched from the golgi apparatus during telophase. Vesicles move along microtubules and create a cell plate. This becomes the cell wall of both new cells. That is how the cell wall is created through plant mitosis. In animals, the cells have a structure called centrioles. Centrioles create spindle fibers to pull the sister chromatids apart. In plants, these fibers grow on their own. 3.What is the role of the centrosome (the area surrounding the centrioles)? Is it necessary for mitosis? Defend your answer. Centrosomes are associated with nuclear membrane during the interphase stage of mitosis. The role of the centrosome is to assemble the microtubules and connect them with the chromosomes to build the mitotic spindle. All microtubules are produced from the centrosome. It is needed for mitosis because without the centrosome there wouldn t be microtubule formation which means the chromosomes would not separate. This is extremely necessary because if the chromosomes don t separate in the sperm or egg then it could cause a genetic disorder, this is because the offspring will have either too many or too little chromosomes. This is why the centrosome is important to mitosis and why mitosis is necessary.
Answers:1) enzymes speed up the rate of the reaction. they do this by lowering the activation energy requirement. 2) stomach 3) you're in AP, you're treading quicksand if you just copy every answer.
Answers:Ask your Biology Lab teacher to help you.
Answers:Osmosis is where water moves from a low concentration of solutes(ions etc) to one of a high concentration. This is because in a high solute conc the water conc is lower so it is moving from a high water conc to alower one Diffusion is where a solute movies from a high conc to a lower one Active transport required ATP to move solutes AGAINST their conc gradients from a low conc to a higher one Hope that helps Edit: I used my knowledge, not wikipedia, it's your choice :)