Which statement is correct about rough ER and smooth ER? (1 point)
• Rough ER transports proteins, and smooth ER contains ribosomes.
• Rough ER transports materials other than proteins, and smooth ER contains ribosomes.
• Rough ER contains ribosomes, and smooth ER transports proteins.
• Rough ER contains ribosomes, and smooth ER transports materials other than proteins.