You can either use
wp_enqueue_script('jquery', 'URL', array(), '', false);
or
wp_enqueue_script('jquery', 'URL', array(), null, false);
or you can put a generic name placeholder
wp_enqueue_script('jquery', 'URL', array(), 'custom', false);
But particularly with "jquery" I would deregister the default if you want to replace it
wp_deregister_script('jquery');
$GoogleJqueryURI = 'http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js';
wp_register_script('jquery', $GoogleJqueryURI, array(), 'custom', false);
wp_enqueue_script('jquery');
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