A general partner of a limited partnership may make contributions to the partnership and share in the profits and losses of and in distributions from the limited partnership as a general partner. A general partner also may make contributions to and share in profits, losses and distributions as a limited partner. A person who is both a general partner and a limited partner has the rights and powers and is subject to the restrictions and liabilities of a general partner and, except as provided in the partnership agreement, also has the powers and is subject to the restrictions of a limited partner to the extent of his participation in the partnership as a limited partner.