Question

Which is the site of cellular respiration in prokaryotes?
a. Mitochondrion
b. Plasmids
c. Plasma membrane
d. Cytosol

Answer 1

Hint: Prokaryotes are unicellular organisms which lack true nucleus and this organisms lack membrane bound organelles, which are present in eukaryotes, and they lack mitochondria and so many organelles and it contains only a cell membrane, and all organelles are suspended in the cytoplasm.

Complete answer:
Most of the prokaryotes are bacteria, and they have different shapes, and they contain locomotory organs for the movement they are flagella, and based on shapes they are divided into different shapes. They are:

> Cocci: These are spherical or ovoid-shaped bacteria, when these bacteria undergo binary fission, sometimes they do not detach and stick like that and form diplococcus a pair of cocci, Streptococcus is a chain of cocci,
Staphylococcus is a cluster of cocci,
Tetrads are 4 cocci forming square shape,
Sarcinae is a cube-shaped form with 8 cocci.

> Bacillus: These are rod-shaped bacteria, similar to cocci, these are arranged either solitary or normal. diplobacillus 2 bacilli together, and streptobacilli is a chain or bacillus.
Spiral shaped bacteria, they are
Spirillum thick and tough spiral.
Spirochetes is a thin and flexible spiral.
Vibrios comma-shaped rods with a twist.

Prokaryotes are the single-cell organism, and they lack so many organisms, such as chloroplast and the mitochondria, and bacteria do not contain the true nucleus, they contain double-strand DNA which is circular in shape, and it is called as nucleolus and they lack nucleoid membrane. They contain the cell membrane and cell wall, and they have Peptidoglycans in the cell wall. They mainly reproduce through binary fission.
As they lack mitochondria respiration occurs by plasma membrane.

Hence, the correct answer is option (C).

Note: Most of the prokaryotes are bacteria, they present both as symbiotic and parasitic forms.Most of the animals contain bacteria of the archaea where this contains all the enzymes to synthesize the vitamin B12 or cobalamin which is required for various metabolism’s in the body.