Yes, one person can be the sole general partner. How to proceed depends on the terms of your partnership agreement. If that is not absolutely clear, you should visit with your attorney. Because this was set up for a specific purpose, you need to make sure that you handle this properly. That means speaking to your lawyer.
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I believe they can be. But you will have to update your filings with the state. You may also wish to speak with an attorney to review your estate planning mechanis given the new set of circumstances.
The foregoing is not legal advice nor is it in any manner whatsoever meant to create or impute an attorney/client relationship.
There are plenty of good attorneys in Cheyenne who can help you. You need to set up an appointment with one (preferably the attorney who put the estate plan together) and show him/her your paperwork. This isn't a DIY situation.