[plt-scheme] Is there a way to "apply" a macro?

I'm kind of new to Scheme,  but it seems to me constructing code at runtime
would be a job for eval.  I'm assuming this would end up being something
like:

(eval (list macro-name (list expr [literal1 val1] [literal2 val2] ...))
<environment>)

I'm working from the assumption that macros are essentially functions for
writing code and that it would be available at runtime as it is from the
REPL.

Hope this helps,

Kurt
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