Skip to main content

STRUCTURE OF A VIRUS - Class 11 Biology Online Notes


STRUCTURE OF A VIRUS - Class 11 Biology Online Notes

NCERT Biology Class 11 - Viruses contain nucleic acid—either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) and protein. The nucleic acid encodes the genetic information which is unique for each virus. The infectious, external covering (core) of a virus is called the virion. The virion capsid has three functions:
(1)  Protection of the viral nucleic acid from digestion by certain enzymes (nucleases).
(2)  To furnish sites on its surface that help to recognize and attach (adsorb) the virion to receptors on the surface of the host cell, and, in some viruses.
(3)  It provides proteins that enable the virion to penetrate through the cell surface membrane inject the infectious nucleic acid into the interior of the host cell.
 It contains at least one unique protein which is synthesized by specific genes in the nucleic acid of that virus. In virtually all viruses, at least one of these proteins forms a shell (called a capsid) around the nucleic acid either DNA or RNA. The capsid consists of numerous capsomers, each having a few monomers or structural units. Each structural unit is made up of one or more polypeptide chains. The different arrangement of capsomeres in the capsid determines the shape of a virion. Viruses have three different types of symmetry as explained below: 
Click for complete Online Notes STRUCTURE OF A VIRUS - Class 11 Biology 
Check out another topic of class 11
Labels:

Comments

Post a Comment

Thank you we will contact ASAP.

Popular posts from this blog

Lessons-Worksheets-Question Papers-CBSE Class 2 English

Lessons-Worksheets-Question Papers-CBSE Class 2 English CBSE 2nd Class English – One and Many  In this blog, we share the spelling rules used in the concept of  One  and Many. When there is only one of a naming word (noun), it is said to be a  singular noun . When a noun shows more than one, it is said to be in the  plural . We can add  –S, -es, -ves or ies  to show that there is more than one noun.  For example,  we say many birds, four biscuits, six brushes. But for the students of  Class 2 , it’s very difficult and confusing to understand where to use  s , es, ves or ies  in the form of many. Don’t worry, it looks difficult, but it is very easy as in grammar each concept has a set of rules that need to practice. Noun ending with  –s, -x, -o, -sh, -ch, and –ss  form plurals by taking  –es. Look at these pairs of words: Bus – Buses Brush – Brushes Continue ..... Click here ...
Post a Comment
Read more

Allotment of DIN (Director Identification Number)

Allotment of DIN (Director Identification Number) CS professional course :  Section 153 of the Companies Act, 2013 read with Rule 9 of the Companies (Appointment and Qualification of Directors) Rules, 2014 Every individual intending to be appointed as a director as a director of a company shall make an application for allotment of Director Identification Number (DIN) to the Central Government in such form and manner and along with such fees as may be prescribed. Rule 9 of Companies (Appointment and Qualification of Directors) Rules, 2014 (1) Every Individual, who is to be appointed as a director of a company shall make an application electronically in Form DIR 3, to the Central Government for the allotment of a DIN along with such fees as provided in the Companies (Registration Offices and Fees) Rules, 2014. (2) The Central Government shall provide an electronic system to facilitate submission of an application for the allotment of DIN through the portal on the MCA21...
Post a Comment
Read more

Class 3 English Practice Grammar Worksheet -The Adverb

 Class 3 English Practice Grammar Worksheet -The Adverb Class 3 English – The Adverb – Kinds of Adverb Fill in the blanks with suitable Adverbs of place. Choose from the box.  Up               outside                       everywhere                 back                down      away          here                           there                     ...
Post a Comment
Read more