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MDCAT
Biology
2021

Biology · Bioenergetics

Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.

Question

The glycine generated during photorespiration enters?

Options
  • A

    Glyoxysomes

  • B

    Mitochondria

  • C

    Peroxisomes

  • D

    Ribosomes

Explanation

Glycine generated during photorespiration is converted to serine, in the mitochondria which liberates CO2 and ammonia and leads to the reduction of NAD+ to NADH.

Glyoxysomes are specialized organelles found in plant cells that are involved in lipid metabolism, particularly the conversion of stored lipids (fats) into carbohydrates during seed germination. They are not directly involved in the fate of glycine during photorespiration.

Glycine generated during photorespiration is converted to serine, in the mitochondria which liberates CO2 and ammonia and leads to the reduction of NAD+ to NADH.

Peroxisomes are small vesicles, single membrane-bound organelles found in the eukaryotic cells. They contain digestive enzymes for breaking down toxic materials in the cell and oxidative enzymes for metabolic activity.

Ribosomes are cellular structures responsible for protein synthesis. They are not involved in the metabolic fate of glycine during photorespiration.

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Tagged under Biology · Bioenergetics · 2021