Biology, 22.09.2021 14:00, sydneykated
B. A student investigated the diffusion of substances using a Visking tubing, an
artificial membrane which has some of the properties of cell membranes as
shown below.
elastic
band
top of syringe
test tube
starch solution
Bag filled with starch
solution and placed into
a test-tube of water
water
Visking
bag
knot
The student added some iodine solution to the water in the test tube.
After 30 minutes at room temperature, the contents of the Visking bag were
stained blue-black, but the water outside remained a yellow colour.
i. Explain the results.
Answers: 3
Biology, 22.06.2019 11:00, nakeytrag
You want to cultivate some exotic plants at your farm. however, the climate is chillier than the temperature range favorable to the crop. which is the best method to use for the cultivation of this exotic crop? a. use a crop rotation method b. use a lot of fertilizer c. prepare the seed bed properly d. use a greenhouse e. use irrigation
Answers: 1
Biology, 22.06.2019 15:30, kittycatwaffels
Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c. carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit
Answers: 1
B. A student investigated the diffusion of substances using a Visking tubing, an
artificial membra...
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