Choose the incorrect statement about cell structure.
(a) Plant cells have cell walls, whereas animal cells do not.
(b) Ribosomes are the main sites of energy production for the cell.
(c) Plant cells have chloroplast, whereas animal cells do not.
(d) Lysosomes function in the digestion of cellular waste products.
(e) Many cellular organelles are interrelated through an endomembrane system.

Hint: It is ribonucleoprotein and it can contain equal parts of RNA and proteins along with an array of other important components required for protein synthesis. In comparison with eukaryotes to prokaryotes, prokaryotes exist freely but eukaryotes are found either free or attached to the endoplasmic reticulum.

Complete answer:
Ribosomes are responsible for protein synthesis. It is small organelles
Ribosomes are present in all cells.
Mitochondria are called the powerhouse of the cell, so energy from organic compounds is used to make ATP.

Additional Information:
-Plasma membrane is made up of lipids and proteins where the composition may fluctuate depending on fluidity, outer environment, and the various phases of development of the cell.
-Cell wall, it is an extra non-living layer present on the outer side of the cell membrane in certain cells that gives structure, protection, and filtering mechanism to the cell is the cell wall.
-Centrioles are cylindrical structures generally present in eukaryotic cells which are made essentially out of the protein tubulin.
-Cilia and Flagella, are little hair-like projections from the cell made of microtubules and covered by the plasma membrane.
-Cytoplasm, it refers to everything present inside the cell except the nucleus.
-Endoplasmic Reticulum (ER), in eukaryotic cells, is present as an interconnection of tubules that are associated with the nuclear membrane.
-Mitochondria, its main role is in the synthesis of energy and is called the powerhouse of the cell, it releases energy in the form of ATP that is required for the proper functioning of all the cell organelles.
So the correct answer is ‘Ribosomes are the main sites of energy production for the cell’.

Note: In the case of prokaryotic cells, the ribosomes are of the 70S with the larger subunit of 50S and the smaller one of 30S. Eukaryotic cells have 80S ribosomes with 60S larger subunit and 40S smaller subunit. Ribosomes arrange the amino acids in the order indicated by tRNA and assist in protein synthesis.