The funny thing about this question is that it was asked almost verbatim within one of the accounts of Jesus' life. So I guess it would be appropriate to just quote the text. Its uncanny how closely your question resembles the original:

Quote:

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Mar 12:18 Then come unto him the Sadducees, which say there is no resurrection; and they asked him, saying,
Mar 12:19 Master, Moses wrote unto us, If a man's brother die, and leave his wife behind him, and leave no children, that his brother should take his wife, and raise up seed unto his brother.
Mar 12:20 Now there were seven brethren: and the first took a wife, and dying left no seed.
Mar 12:21 And the second took her, and died, neither left he any seed: and the third likewise.
Mar 12:22 And the seven had her, and left no seed: last of all the woman died also.
Mar 12:23 In the resurrection therefore, when they shall rise, whose wife shall she be of them? for the seven had her to wife.
Mar 12:24 And Jesus answering said unto them, Do ye not therefore err, because ye know not the Scriptures, neither the power of God?
Mar 12:25 For when they shall rise from the dead, they neither marry, nor are given in marriage; but are as the angels which are in heaven.

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Just in case your not familiar with the context basically the Saducees were a group of religious leaders which followed Jesus around trying asking him all these questions to try to ensnare Him. There were also a group of religious leaders called the Pharisees which were quite similar. Eventually these religious groups were responsible for crucifying Jesus by bringing up false charges, and enciting the Romans.