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NEU Microbiology Spring 2011 Ch 19
These flashcards go over all review material at the end of the chapter
13
Microbiology
Undergraduate 1
03/24/2011

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Cards

Term
What is antigenic drift?
Definition

Antigenic drift is in flu viruses, minor changes in viral proteins due to gene mutation

Term
What is antigenic shift?
Definition

In flu viruses, antigenic shift is major change in the viral protein due to gene reassortment

Term
What is a concatemer?
Definition

A concatemer is two or more identical linear nucleic acid molecules in tandem

Term
What is a hepadnavirus?
Definition

A hepadnavirus is a vrisu whose DNA genome replicates by way of an RNA intermediate

Term
What is a negative strand?
Definition

A negative strand is a nucleic acid strand that has the opposite snese to the mRNA that is produced

Term
What is a nucleocapsid?
Definition

Nucleocapsid is the complete complex of nucleic acid and protein packaged in a virus particle

Term
What are overlapping genes?
Definition

Overlapping genes are tow or more genes in which part of all of the one gene is embedded in the other

Term
What is the positive strand?
Definition

The positive strand is a nucleic acid strand that has the same sense as the mRNA

Term
What is a polyprotein?
Definition

A polyprotein is a large protein expressed from a single gene and subsequently cleaved to form several individual proteins

Term
What is a replicative form?
Definition

A replicative form is a double-stranded DNA moelcule that is an intermediate in the replication of single-stranded DNA viruses

Term
What is RNA replicase?
Definition

RNA replicase is an enzyme that can produce RNA from an RNA template

Term
What is rolling circle replication?
Definition

Rolling circle replication is a mechanism used by some plasmids and viruses of replicating circular DNA which starts by nicking and unrolling one strand and using the other still circular strand as a template for DNA synthesis

Term
What is transposase?
Definition

Transposase is an enzyme that catalyzes the insertion of DNA segments into other DNA molecules

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