tailieunhanh - Science reason english 6

Tham khảo tài liệu 'science reason english 6', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | ACT SCIENCE REASONING TEST PRACTICE 6 5 4 3 2 1 0 0 1 2 Distance traveled cm 3 Distance traveled cm Log Weight Weight Da 65 000 35 000 17 000 14 000 11 000 8 000 6 000 76. Which statement characterizes the migration of SDS-associated proteins f. Diffusion moves the proteins from a region of higher concentration to one of lower concentration. g. An electric field causes negatively charged objects to migrate toward the anode positive end . h. The electrical resistance of negatively charged objects determines the speed of migration. j. Osmosis of water indirectly causes the migration of the proteins. 77. A protein of weight 45 000 Da would be expected to migrate to the region on the graph marked a. W. b. X. c. Y. d. Z. 78. A protein essential for metabolism has just been discovered. SDS-PAGE reveals that this protein migrates a distance of cm. Which statement best characterizes the new protein f. The weight of the protein is somewhere between 6 000 Da and 11 000 Da. g. The weight of the protein is somewhere between 11 000 Da and 17 000 Da. h. The weight of the protein is somewhere between 14 000 Da and 17 000 Da. j. The weight of the protein is somewhere between 17 000 Da and 35 000 Da. 309 ACT SCIENCE REASONING TEST PRACTICE 79. Another essential protein in metabolism is made up of two units each unit traveling a different distance from the other. The combined weight of the two units is approximately 50 000 Da. Referring to the regions W X Y and Z on the graph which combination will NOT give the possible weight of each unit a. X Z b. Y Z c. X Y d. W Y 80. What would happen if an electric field were to be applied to SDS-PAGE for an indefinite length of time f. Larger proteins will reach the anode before the smaller proteins. g. All proteins will eventually reach a limiting resistance in the matrix at which point they cease to migrate further. h. Proteins associated with more SDS will .