As a developer giving interviews over the phone I really do not care if you know the difference between a struct and a class - you could have that printed out in front of you or have a laptop open to find the answer.
I am more interested in how you work, what things you have developed (tell me what you did and why you are proud of it), show me that you are keen to do development. Then I can target my questions more to your experience. If you developed a front end then I'll ask you about JQuery for example.
If you don't know the answer then be honest and say so. If the interviewer marks you down and decides not to hire you because you don't know which HTML tags have been deprecated or the difference between boxing and unboxing then you really don't want to work for that person.