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.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
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

Biology 18&19 Vocab

Chapter 18 & 19 Vocabulary

Pathogen Agent that causes disease.
Viroid An infectious particle made of single-stranded RNA without a protein coat, that almost always uses plants as its host.
Prion An infectious agent that consists of a protein fragment that can cause other proteins to fold incorrectly.
Capsid The protein shell that surrounds a virus.
Bacteriophage A virus that infects bacteria.
Epidemic The rapid outbreak of a disease that affects many people.
Vaccine A substance that stimulates an immune response, producing acquired immunity without illness or infection.
Obligate Anaerobe A prokaryote that cannot survive in the presence of oxygen.
Obligate Aerobe A prokaryote that cannot survive without the presence of oxygen.
Facultative Aerobe An organism that can live with or without oxygen.
Flagellum Whip-like structure outside of a cell that is used for movement.
Plasmid A circular piece of genetic material found in bacteria that can replicate separately from the DNA of the main chromosome.
Conjugation The process by which a prokaryote transfers part of its chromosome to another prokaryote.
Toxin A poison released by an organism.
Antibiotic A chemical that kills or slows the growth of bacteria.
Protist A eukaryote that is not an animal, plant, or fungus.
Protozoa An animal-like protist.
Pseudopod A temporary extension of cytoplasm and plasma membrane that helps protozoa move and feed.
Cilia Short, hair-like structures that cover some or all of the cell surface and help the organism swim and capture food.
Algae Photosynthetic, plant-like protists.
Modify To change somewhat the form or qualities of something.
Compile To gather together (materials from various sources) into one place.
Prove To establish the truth or genuineness of, as by evidence or argument.
Alternative A choice limited to one of two or more possibilities; a possible course.
Revise To amend or alter.
Created by: sydneyrs



Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards