only need help on 3

Starting from the 8-bit operand 11001010, show the values obtained after sequential application of each shift microoperation, both left and right, until the contents are all zeros. What is the mask and the operation that needed to be used to change the contents of a register whose current content is 01110101 11101101? a) to invert all the alternate bits (starting from the MSB). b) to set all the alternate bits to 0 (starting from the MSB). c) to set all the even bits to 1 (starting from the MSB). Suppose you want to replace the contents of selective bits of a 16 bit register. What is/are the operations you need to do to replace 7th, 8th, 9th and 11th bits by 0, 1, 1, 0 respectively