goo38, thank you for response. Three more questions:

1) Any idea as to how long the transfer from Coinbase to Bittrex might take?

2) I would like to buy other coins with this bitcoin immediately. Bittrex says that it might take up to two weeks. Has anybody experienced this?

3) I got an email today saying this:
"
The User Activated Hard Fork (UAHF) is a proposal to increase the Bitcoin block size scheduled to activate on August 1. The UAHF is incompatible with the current Bitcoin ruleset and will create a separate blockchain. Should UAHF activate on August 1, Coinbase will not support the new blockchain or its associated coin.
The User Activated Soft Fork (UASF) is a proposal to adopt Segregated Witness on the Bitcoin blockchain and could result in network instability. It is scheduled to activate at the same time as the UAHF.
"

a) Can anybody tell me how it'll affect my transfer of bitcoin from Coinbase to Bittrex?
b) How it might affect my purchase of other coins using the bitcoin on Bittrex?

I really appreciate anyone who responds.