Question

Respiratory enzymes of aerobic bacteria are mainly located in
A. Mitochondria
B. Chondroids
C. Sphaerosomes
D. Phagosome
E. Polysomes

Answer 1

Hint: The aerobic bacteria are tiny, single-celled prokaryotic organisms that require oxygen to live and grow. Cellular respiration is the metabolic process by which aerobic bacteria exchange gases with their environments.

Complete answer:
The bacterial cell is covered by an outer slime layer or capsule, a middle cell wall, and an inner cell membrane. The cytoplasm of bacteria lacks most organelles, namely endoplasmic reticulum, mitochondria, golgi apparatus, centrosome, vacuoles, lysosomes, microfilaments, intermediate fibres, and microtubules. It contains a variety of inorganic and organic molecules including glycogen granules, lipid droplets, sulphur granules, and polyphosphate granules that function as storage reservoirs. Polyphosphate granules take different stains with basic dyes and are therefore called metachromatic granules. Some bacteria such as Bacillus subtilis have mesosomes, the infolds of the cell membrane to bear respiratory enzymes. These are also called chondroid.

So, the correct answer is option B, i.e., Chondroids.

Note: Ribosomes are the only cytoplasmic organelles found in all prokaryotic cells. They are smaller than the ribosomes of eukaryotic cells. They may occur singly or in rows called polyribosomes or polysomes. The ribosomes function as the site for protein synthesis. There are no true, fluid-filled vacuoles. Some prokaryotic cells, usually the photosynthetic, free-floating forms, form gas vacuoles in the cytoplasm. The gas vacuoles are surrounded by a thin membrane, not a unit membrane, are permeable to atmospheric gases and they keep the bacteria floating on or near the surface of the water to receive light for photosynthesis or to avoid strong light.