Question

mitochondrial matrix contains
a) Enzymes
b) DNA and RNA
c) Ribosomes
d) All of the above

Answer 1

Hint: Mitochondria is the membrane-bound organelle. Mitochondria is the powerhouse of the cell. It is used in the production of ATP molecules which are used for the energy production in the cell. It generates the chemical energy of the cell.

Complete answer:
The mitochondria consist of double-membrane- the outer membrane and the inner membrane. The outer membrane covers the whole cell. Between the two membranes is a space present which is known as the intermembrane space. The outer membrane is permeable in nature whereas the inner membrane is not much permeable. The inner membrane is involved in the electron transport and also in the transportation of the ATP formed. The inner membrane surrounds the mitochondrial matrix where the process of the citric acid cycle takes place. The mitochondrial matrix is located inside the inner membrane. The Matrix is viscous in nature. It contains mitochondrial DNA, ribosomes, enzymes organic, and inorganic ions. The enzyme present in the matrix helps in the production of ATP by facilitating the citric acid cycle and oxidative phosphorylation. Some of the enzymes present in the matrix are pyruvate dehydrogenase, citrate synthase, aconitase, isocitrate dehydrogenase, fumarase, and malate dehydrogenase are some of the enzymes present in the mitochondrial matrix.
So, the answer is ‘all of the above’.

Note: Mitochondrial matrix has a ph of about 7.8 which is greater than the intermembrane space ph. Mitochondrial DNA present in the matrix is double-stranded and is circular. It is said to be rich in guanine and cytosine content. The mitochondria contain the ribosomes of 55s.