Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Chp. 23 & 24

Vocab for 23 & 24 Biology

Halophile An organism that can grow in, or favors environments that have very high salt concentrations
Bacillus A rod-shaped bacterium
Coccus A sphere-shaped bacterium
Spirillum A spiral-shaped bacterium
Streptococcus A coccus that grows with others in chains
Virulent Describes a microorganism that causes disease and that is highly infectious; strictly, refers only to viruses that reproduce by the lytic cycle
Oncogene A gene that produces cancer, or uncontrolled cell proliferation
Viroid An infectious agent that is made up of a short, circular, single strand of RNA that does not have a capsid; the smallest known particle that is able to replicate
Prion An infectious particle that consists only of a protein and that does not contain DNA or RNA
Virus A nonliving, infectious particle composed of a nucleic acid and a protein coat; it can invade and destroy a cell
Envelope A membranelike layer that covers the capsids of some viruses
Retrovirus A virus that contains single-stranded RNA and produces a reverse transcriptase, which converts RNA to DNA
Bacteriophage A virus that infects bacteria
Lytic cycle A method of viral replication that results in the destruction of a host cell and the release of many new virus particles
Virulent lysis The event of a phage enzyme called a lysozyme digesting the cell wall, and up to to 200 new phage particles bursting from the bacterial cell
Lysogenic cycle A method of viral replication in which a viral genome is replicated as a provirus without destroying the host cell
Temperate virus A virus whose replication includes the lysogenic cycle
Prophage The viral genome (DNA) of a bacteriophage that has entered a bacterial cell, has become attached to the bacterial chromosome, and is replicated with the host bacterium's DNA
Inactivated virus A commercially-prepared vaccine against various viral infections
Attenuated virus A vaccine created by reducing the virulence of a pathogen, but still keeping it viable
Vector In biology, any agent, such as a plasmid or a virus, that can incorporate foreign DNA and transfer that DNA from one organism to another; an intermediate host that transfers a pathogen or a parasite to another organism
Antibiotic A substance that inhibits the growth of or kills microorganisms
Conjugation In algae and fungi, an exchange of genetic material that occurs between two temporarily joined cells; in prokaryotes, the process by which two organisms bind together and one cell transfers DNA to the other cell through a structure called a sec pilus
Obligate anaerobe An organism that needs the absence of oxygen in order to live
Facultative anaerobe An organism that can live with or without oxygen
Exotoxin A potent, extracellular toxin secreted by some gram positive bacteria
Endotoxin A toxin that occurs in the outer membrane of Gram negative bacteria and that is released when the bacterial cell breaks apart
Antibiotic resistance The ability of a population of bacteria to survive the lethal effects of an antibiotic
Pathology The scientific study of disease
Created by: CareGraceR