Hi Chris,
In Moodle terminology, the words "Course", "Quiz" and "Lesson" all mean something different and precise. It is impossible to understand your problem if you do not use those 3 words in their "Moodle meanings". Please re-phrase your question so we can understand it and help you.
Joseph
Again you are mixing up the Quiz and Lesson activities terms, so it's difficult to understand what you mean.
"I have created on the question bank a lot of cloze type questions and i want to add them to a lesson"
If you use the word "lesson" here in the sense of the Moodle Lesson activity, then you cannot have Cloze type questions inside a Lesson.
Joseph
To allow/prevent a student access to an activity (such as seeing a powerpoint page), based on success/failure (i.e. score) in another activity (e.g. a quiz) you can use the Conditional_activities feature.