Glyoxysomes are specialized organelles found primarily in:
A. Germinating oil seeds
B. Animal liver cells
C. Fungal spores
D. Mature plant leaves
Answer: Option A
Solution (By JKExamLibrary)
Glyoxysomes are specialized peroxisomes found in the fat-storing cotyledons of germinating seeds. They contain enzymes for the beta-oxidation of fatty acids and the glyoxylate cycle, which converts stored lipids into carbohydrates (gluconeogenesis) to nourish the growing seedling. This metabolic pathway is absent in animal cells. Exam tip: Glyoxysomes eventually transform into chloroplasts as the plant matures.
Explanation:
Turgor pressure from water in the vacuole pushes the cell membrane against the wall, maintaining rigidity. Plasmolysis occurs in hypertonic solutions; osmosis is water movement; high solute concentration lowers water potential.
Explanation:
Pebrine is a serious disease of silkworms caused by the microsporidian Nosema bombycis, transmitted transovarially. It was identified by Louis Pasteur. Flacherie is bacterial, muscardine is fungal, grasserie is viral. Pebrine control involves screening mother moths and destroying infected eggs.
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