The outer shell of a virus particle is made up of proteins and it is called a capsid. Inside this capsid is present the nucleic acid i.e. DNA or RNA. The capsid is responsible for providing the specificity to the viruses. In certain viruses, this capsid is further enveloped by a fatty layer. Such virions become inactivated when they are exposed to fat solvents e.g. ether and chloroform.
Most of the virions are composed of a capsid that has twenty triangular faces. They are arranged in the form of capsomeres and the nucleic acid present inside them is densely coiled. The capsid of other virions consists of irregular spikes that are present on their surface. The capsid of the viruses that attack plants is a naked cylinder and lacks the fatty layer.
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
A woman who is heterozygous, Bb, has brown eyes;
Explain why familial breast cancer shows a dominant pattern of inheritance in
How is an F′ factor different from an F factor?
With regard to the timing of conjugation, explain why the recipient
The raw material for evolution is random mutation. Discuss whether or
Why is an antibody used in this experiment? From
Explain the type of speciation (allopatric, parapatric, or sympatric
In fruit flies, curved wings are recessive to straight wings,
A recessive allele in mice results in an unusally long neck.
