Cell Biology and Structure

The outermost layer of the permanent region is made of thick-walled impermeable cells.

Kreb's cycle takes place in matrix of mitochondria. Hence, all enzymes for Kreb's cycle is found in mitochondria.

Mycoplasma is the smallest known cell. It is about 0.1 micrometres in diameter.

This is the correct answer as mitochondria is the powerhouse of the cell. It uses molecular oxygen and generates energy-rich compound (ATP). 

This is an incorrect pair as lysosomes are not the site of cellular respiration. 

The nucleus is often called the director of a cell because it controls all the metabolic and other cell functions.

Chloroplast (green plastid) helps in photosynthesis. It is known as "the kitchen room" of a cell.

Leucoplasts are primary organelles in which materials such as starch, oils and protein granules get stored. Leucoplasts are also known as white plastids.

Lysosomes secrete digestive enzymes. They help to keep a cell clean by digesting any foreign material.

Endoplasmic reticulum divides the cytoplasm into small compartments. It gives rigidity to a cell. 

Adenosine triphosphate is often known as the energy currency of cell because the energy required for various chemical activities needed for life is released by mitochondria in the form of ATP. 

Plastids are present only in plant cell. 

The inner-surface proteins cooperate with other proteins in energy yielding reactions.

Microcompartments are the polyhedral membrane bound compartments in the bacterial cell that are made up of a protein shell and enclose various enzymes. These polyhedral organelles localise and compartmentalise bacterial metabolism, a function performed by the membrane-bound organelles in eukaryotes.

S-layer acts as a partial permeability barrier for large substrates. It keeps extracellular proteins near the cell membrane by preventing their diffusion away from the cell.