Question

protein synthesis
the image represents protein synthesis. imagine the protein being produced is to be exported as an enzyme. which organelles are involved in this process, from start to finish?
a dna, rna, ribosome
b nucleus, ribosome, mitochondria, er
c nucleus, ribosome, er, golgi apparatus
d dna, rna, ribosome, er, golgi apparatus
as mentioned in the previous question, an enzyme is produced via protein synthesis. consider the secretion of this enzyme into the environment surrounding a cell. describe how the process of secretion takes place.
a the golgi apparatus releases the enzyme into the cytoplasm, where it migrates to the cell membrane and is released via diffusion.
b the golgi apparatus packages the enzyme in a vesicle. that vesicle moves to the cell membrane and the enzyme is released via exocytosis.
c the golgi apparatus migrates to the cell membrane and its membrane merges with the cell membrane, releasing the enzyme via facilitated diffusion.
d the golgi apparatus packs the enzyme in a vesicle. the vesicle then carries the enzyme to a gated protein channel in the cell membrane for release into the external environment.

Explanation:

• For the first question:
• DNA and RNA are not organelles, so options A and D are incorrect.
• Mitochondria is not directly involved in the protein synthesis and export process described. The nucleus (transcription occurs here), ribosome (translation occurs here), ER (modifies proteins), and Golgi apparatus (packages and sorts proteins for export) are the relevant organelles.
• For the second question:
• Option A: Diffusion is not the way enzymes are secreted. Enzymes are large molecules and need a more active process.
• Option C: The Golgi apparatus does not migrate to the cell membrane. Also, facilitated diffusion is for specific small molecules, not large enzymes.
• Option D: Vesicles do not carry enzymes to gated protein channels for secretion. The process is exocytosis.
• Option B: The Golgi apparatus packages the enzyme in a vesicle. The vesicle moves to the cell membrane and the enzyme is released via exocytosis, which is the correct process.

Answer:

First question: C. nucleus, ribosome, ER, Golgi apparatus
Second question: B. The Golgi apparatus packages the enzyme in a vesicle. That vesicle moves to the cell membrane and the enzyme is released via exocytosis.