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RX/TX on Copper and Fiber cable

On Fiber cable , even though the end of the cable is connected to one port on the switch (fiber cable port), but it Transmits and Receives Frames at the same time
On copper cable if I am not wrong there are about 5 or 6 wires , twisted in pairs . Which of them do Transmit and Receive Frames?
and if there are TX/RX capabilities on copper cable then do we need to configure UDLD/Loop Guard ?

Thank you
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UDLD will alert the Switch when one a link (TX or RX) is broken and the Switch puts the port in Err-Disabled

Loopguard when enabled then if a switch Forwards BPDUs but does not receive any, it will turn into loop-inconsistent state . Though I wonder why it cannot turn into Blocking State

--Now if UDLD and Loopguard are applied both at the same time will they accomplish the same thing? if so then why not just apply one of them ?
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Well in another thread I just closed, the Expert stated that UDLD is used only on Fiber and Loop Guard on Copper..
Can you provide us with the link to that question?

MO
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That said, and i do agree, i have seen unidirectional Copper also (defective receiver circuitry on one side, the copper connection was)  intact. So blackholing does occur, but broken fibers are more common.
These connections failures were more common when people connected ISDN to Ethernet switches... i agree to that being foolish but it was done.

Also there is a single fiber with bi-directional data transmission, it is used in residential area  fiber deployments  to connect homes to the internet. I agree not often seen outside of that realm, but single fiber connections with bi directional data transfer does exist.
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