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4. Cell membranes and transport
A section of Biology, 9700
Listing 10 of 418 questions
Use shows a diagram of a plasma (cell surface) membrane. K L N M Indicate, by putting a circle, , around one of the following, the width of the membrane shown in . 0.7 nm 7.0 nm 70 nm 7 × 10–5 m 700 µm 7.0 µm Outline the functions of the following components of the plasma membrane. K L M N Examiner’s Use Some substances may cross plasma membranes by simple diffusion. Glucose, however, does not. Explain why glucose cannot pass across membranes by simple diffusion. In an investigation, animal cells were exposed to different concentrations of glucose. The rate of uptake of glucose into the cells across the plasma membrane was determined for each concentration. shows the results. concentration of glucose / arbitrary units rate of uptake of glucose by cells / arbitrary units Using the information in , explain how the results of the investigation support the idea that glucose enters cells by facilitated diffusion. QUESTION 6 CONTINUES ON PAGE 14 Examiner’s Use State how active transport differs from facilitated diffusion.
9700_s07_qp_2
THEORY
2007
Paper 2, Variant 0
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Questions Discovered
418