Virus Structure

What feature do viruses have in common with animal cells?

• ability to form proteins at the ribosomes
• existence of lipids in cell membranes
• presence of genetic code in nucleic acid
• production of energy by a mitochondrion

All viruses contain-

• nucleic acids
• ribosomes
• mitochondria
• cytoplasm

Which best describes the basic structure of a virus?

• nucleic acid strand surrounded by a protein coat
• a tail surrounded by a protein coat
• a tail surrounded by a carbohydrate coat
• nucleic acid strand surrounded by a carbohydrate coat

What part of a virus is the protein capsule that houses the genetic material (DNA/RNA)?

• tail
• nucleus
• capsid
• glycoprotein

A(n) _____ is a virus that enters a bacterial cell.

• endospore
• decomposer
• plasmid
• bacteriophage

When a virus invades a living cell, its _______
takes over the cell's functions.

• outer coat
• genetic material
• core
• cytoplasm

What do viruses need to reproduce?

• they need genetic material
• They need a host cell
• They need  bacteria
• They need insulin

Viruses are made up of

• Nucleus, membrane
• Capsid, nucleus
• Capsid, nucleic acid
• Mitochondria, nucleus

Why do viruses have projections on the outside?

• To send signals to other viruses.

• To maintain their structure.

• To attach to the host cell.

• To reproduce.

Viruses are much smaller that even the smallest bacterial cell. For this reason, they must be measured in units called:

• decimeters (dm)

• centimeters (cm)

• nanometers (nm)

• micrometers (um)