What is the structure of a virus BBC Bitesize?

Virus particles have a variety of shapes. They do not have a cellular structure. Instead, they have a core of genetic material surrounded by a protein coat. Their genetic material can be DNA or RNA , but not both.

What is the structure of a virus cell?

Viruses are much smaller than bacteria and consist of a single- or double-stranded nucleic acid (DNA or RNA) surrounded by a protein shell called a capsid; some viruses also have an outer envelope composed of lipids and proteins. They vary in shape.

What is the structure and function of a virus?

Viruses are small obligate intracellular parasites, which by definition contain either a RNA or DNA genome surrounded by a protective, virus-coded protein coat. Viruses may be viewed as mobile genetic elements, most probably of cellular origin and characterized by a long co-evolution of virus and host.

How does a virus work BBC Bitesize?

When they have infected a suitable host cell or cells, they replicate themselves within the cell thousands of times. They do not divide and reproduce, but replicate their DNA and protein coats. These are then assembled into new virus particles.

What are the 5 stages of viral replication?

The viral life cycle can be divided into several major stages: attachment, entry, uncoating, replication, maturation, and release.

What are bacteria BBC Bitesize?

Bacteria are among the smallest living things. A single bacterium consists of just one cell, and is called a single-celled, or unicellular organism. Even though it is just a single cell, it can carry out all seven life processes: movement – all living things move, even plants. respiration – getting energy from food.

What are the 3 structures of a virus?

Viruses are further classified into families and genera based on three structural considerations: 1) the type and size of their nucleic acid, 2) the size and shape of the capsid, and 3) whether they have a lipid envelope surrounding the nucleocapsid (the capsid enclosed nucleic acid).

How does a virus structure look like?

Virus capsids predominantly come in two shapes: helical and icosahedral. The helix (plural: helices) is a spiral shape that curves cylindrically around an axis. It is also a common biological structure: many proteins have sections that have a helical shape, and DNA is a double-helix of nucleotides.

What is a virus BBC Bitesize ICT?

A computer virus is a simple program made to harm a computer system. It spreads by duplicating and attaching itself to files. Sometimes the damage is minor but often it can be disastrous. ICT.

What is the structure and life cycle of a virus?

The virus life cycle could be divided into six steps: attachment, penetration, uncoating, gene expression and replication, assembly, and release. The viral capsid (blue) and genome (brown) are schematically drawn for the purpose of explanation.

What are the three parts that make up the structure of most viruses?

The correct answer is (d) Nucleic acid (either DNA or RNA), a capsid, and recognition spikes.