Which of the following is found in viruses and NOT in cells?
a
cytosol
b
ribosomes
c
nucleolus
d
protein capsid
d) protein capsid
The correct answer is option d) protein capsid.
Viruses contain a protein capsid, which is a protective coating made up of protein. This protein capsid surrounds the genetic material of the virus, such as DNA or RNA.
On the other hand, cells have cytosol, which is the fluid inside cells that contains various molecules and organelles. Cells also have ribosomes, which are responsible for protein synthesis. Cells have a nucleolus, which is a region within the nucleus that produces ribosomes and a part of the cell involved in the assembly of ribosomes.
The correct answer is d) protein capsid.
To determine this, let's go through each of the options and understand where they are found.
a) Cytosol: The cytosol is the fluid portion of the cytoplasm in cells, which contains various molecules and organelles. It is found in both cells and viruses.
b) Ribosomes: Ribosomes are cellular structures responsible for protein synthesis. They can be found in both cells and viruses.
c) Nucleolus: The nucleolus is a region inside the nucleus of a cell and plays a role in ribosome production. It can only be found in cells.
d) Protein capsid: A protein capsid is a protective outer coat made of protein that surrounds the genetic material (DNA or RNA) of a virus. It is a characteristic feature of viruses and is not found in cells.
Therefore, the correct answer is d) protein capsid.