Introduction:
EPROM stands for Erasable Programmable Read-Only Memory. It is a type of non-volatile memory that can be electronically programmed and erased. EPROMs are widely used in various electronic devices such as microcontrollers, computers, and consumer electronics.

Bipolar Transistors:
EPROMs do not consist of bipolar transistors. Bipolar transistors are a type of transistor that uses both electron and hole current carriers. They are commonly used in amplification and switching applications. However, in EPROMs, bipolar transistors are not used for memory storage or data retrieval.

UJTs:
EPROMs do not consist of Unijunction Transistors (UJTs) either. UJTs are a type of transistor that has only one pn-junction. They are primarily used in applications such as timing circuits, oscillators, and pulse generators. However, UJTs are not used in EPROMs.

Diodes:
EPROMs do not consist of diodes. Diodes are two-terminal electronic components that allow current to flow in only one direction. They are commonly used in rectification, signal demodulation, and voltage regulation. However, diodes are not used in EPROMs for memory storage or data retrieval.

MOSFETs:
EPROMs consist of Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs). MOSFETs are a type of transistor that are widely used in integrated circuits, including EPROMs. They are used for storing and retrieving data in EPROMs. MOSFETs have three terminals: gate, source, and drain. The gate terminal controls the flow of current between the source and drain terminals. In EPROMs, the MOSFETs are used to store and retrieve binary data by controlling the flow of electrons through the transistor's channel. The data is stored by charging and discharging the gate terminal, which alters the conductivity of the channel and represents the binary states of 0 and 1.

Conclusion:
In conclusion, EPROMs consist of MOSFETs, not bipolar transistors, UJTs, or diodes. MOSFETs are used for storing and retrieving data in EPROMs by controlling the flow of electrons through their channels. EPROMs are widely used in various electronic devices for non-volatile memory storage and data retrieval purposes.