Select the best response to the question.
All of the following are functions of the cell membrane EXCEPT:
A) maintaining cell shape.
B) allowing waste removal from the cell
C)allowing nutrients into the cell.
D) protecting the cell from the environment.
A
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What will be an ideal response?
Glacier ice
What will be an ideal response?
Investigators are studying a protein that must be phosphorylated to be activated. Which method could be used to separate the phosphorylated form of the protein from the form that lacks an activating phosphate group?
A.) equilibrium sedimentation B.) velocity sedimentation C.) ion exchange chromatography D.) differential centrifugation E.) gel filtration chromatography
The accompanying figure shows data from an experiment in which researchers measured how far dynein (a motor protein) traveled in the presence and absence of dynactin (another type of protein). The y-axis shows the percent of the time that the researchers
observed either dynein or dynein + dynactin "walking" a certain distance on a microtubule. What can you conclude from these data?
A) The addition of dynactin caused dynein to travel farther along the microtubule.
B) Dynein traveled farther in the absence of dynactin.
C) A higher fraction of the dynein proteins were motile in the absence of dynactin.
D) Dynactin would have the same effects on dynein movement on microfilaments.