For all Intel Macs until 2016 I believe, they do a POST (power on self test) on startup. If it passes, you’ll hear the bong. If it fails, you get the SMC beeps until you shut down the computer.
One beep usually means no RAM is ''detected,'' so there could be an issue with your RAM connection. Your RAM might not be bad or incompatible - that would result in 3 beeps ( _ _ _ )
Unfortunately I believe the RAM sockets are part of the actual board itself.