Aprotein purification table is shown below and partially filled in. which statement is true? step in purification activity (units) total protein (mg) specific activity ( ) extent of purification ( ) overall yield ( ) crude homogenate 1000 2000 0.5 1 100 ion-exchange chromatography 750 500 1.5 75 affinity chromatography 300 10 _ 60 30 a. the units of extent of purification are mg per ml. b. ion-exchange chromatography is the more powerful purification step. c. specific activity is measured in units of activity per mg protein. d. the overall yield after affinity chromatography is high. e. all statements are tru

Astudent made the lewis dot diagram of a compound as shown. mg is written with two dots shown on its top. an o is written on each side of mg. each o has six dots around it. an arrow is shown from one dot on mg toward the vacant space around the o on the right. another arrow is shown from the other dot on mg toward the vacant space around the o on the left. the title of the art is students lewis dot model. what is the error in the lewis dot diagram? an o atom should transfer all its six electrons to mg because the formula is mgo. both electrons of mg should be transferred to one o atom because the formula is mgo. the electrons should be transferred from each o atom to mg because mg has fewer electrons. the number of dots around mg should be four because it has to transfer two electrons to each o.