Question

Which one of the following statements is incorrect regarding the structure of viruses ?
a) Nucleic materials are covered by a protein coat, called capsid.
b) The capsid is made up of capsomeres
c) Some animal viruses have an additional envelope
d) The additional envelope is made up of glycoprotein

Answer 1

A virus is genetic material (DNA or RNA) covered by a protective coat (capsid) made of protein. This means that the first option is true and cannot be the answer.
Capsid is made of proteins. Capsomeres assemble to form the capsid, so second option is also correct.
Some animal viruses (eg. HIV) have an additional protective coating around the capsid, hence option C is also correct.
The additional envelope is made of phospholipids and proteins and also include some viral glycoproteins.
Option D is the only option which can be marked incorrect, becuase the language suggests that the additional envelope is only made of glycoproteins, which is not true.