Which type of proteins are formed by free and attached ribosomes?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
|
Ribosome Location |
Proteins Synthesized |
Destination |
|
Free ribosomes (in cytosol) |
Structural proteins, enzymes for cytoplasmic functions |
Cytoplasm, nucleus, mitochondria, chloroplasts, peroxisomes |
|
Attached ribosomes (on RER) |
Secretory proteins, membrane proteins, lysosomal enzymes |
ER lumen → Golgi → secretory vesicles, lysosomes, plasma membrane, or exocytosis |
Signal hypothesis: Proteins destined for ER have N-terminal signal sequence recognized by Signal Recognition Particle (SRP), directing ribosome to ER membrane.
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