Which of the following statements regarding the Ras protein is false? a. ras act

Question

Which of the following statements regarding the Ras protein is false?

a. ras activates a cascade of phosphorylation events
b. the ligands are largely steroid hormones
c. ras is monomeric
d. it is regulated by sos, a guanine nucelotide exchange factor

Which of the following statements is correct with respect to flagella and cilia?

a. cilia are generally longer than flagella
b. cilia often have a helical pattern of movement
c. cilia generate a force parallel to the cell surface
d. flagella display an oarlike pattern of beating

Explanation / Answer

(1) C is false. since formation of Ras dimers is essential for Raf1 activation and its dimerization have been noted in liposome also.

(2) C. cilia generate a force parallel to the cell surface. Only then the perpendicular movement is possible.Cilia beat in a rhythmical wave

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