Flashcard Warm-up Microorganisms Very tiny (require a microscope to be seen), unicellular...

Flashcard Warm-up

Microorganisms

Very tiny (require a microscope to be seen), unicellular organisms that can be found everywhere! Many are pathogens (cause disease) while others are beneficial

Examples: bacteria, viruses, protists and fungi (yeast)

Virus a small infectious

agent that can reproduce only inside a living cell (host)

Made of a nucleic acid (DNA or RNA) and a protein coat (capsid)

MICROORGANISMS ORGANISMS NOT VISIBLE WITHOUT A MICROSCOPE

Virus: not living, smaller than bacteria

Bacteria: prokaryotic, unicellular

Protists: algae and protozoa

Fungi: yeast

Pathogen: a disease causing organism

Virus: Structure: a protein coat (capsid), and

DNA or RNA

Lytic cycle: reproductive cycle of a virus

Steps of Lytic Cycle: 1. Attaches to host cell, shape specific (shape determines who

they invade) 2. Injects DNA or RNA into host cell 3. Copies of viral DNA and capsid are made 4. Cell ruptures (lysis) and host cell dies 5. new viruses attach to neighboring cells or particles released to

another host cell

Lysogenic cycle: You sneaky virus! Virus enters cell and remains dormant

(resting) then goes through the lytic cycle (HIV virus, herpes virus)

Types of Viruses:

HIV: a retrovirus (has RNA), infects T cells, transmitted through body fluids (except saliva)

Influenza: the flu, infects respiratory cells

Smallpox: has been eradicated ! Thanks to a vaccine! Infects lymph nodes, lungs, then spreads to other body parts. Obvious sign (skin pustules)

Other Disease Causing Organisms Bacteria:

Steptococcus: strep throat

Protists that causes disease

Plasmodia: causes malaria, commensal relationship with mosquito Vector: an organism that can

transmit the disease without getting it (like the mosquito) 1. infected mosquito bites human and

plasmodia enters blood stream 2. plasmodia invade liver and red

bloods cells , multiple rapidly 3. Red blood cells rupture, and invade 4. plasmodia develop into male and

females which can infect mosquitos 5. reproduction takes place in

mosquitos intestines

Malaria Symptoms:

Headache, shaking, chills, fever

Fungi that cause disease

Candida: yeast that normally lives in our body and starts to multiply rapidly Examples: yeast

infections, oral thrush in babies, or kidney infections

Ticket Out the Door:

1. In order for a virus to reproduce it must have a _______ cell. 2. Put the following steps for the LYTIC cycle in order.

A. Cell ruptures (lysis) and host cell dies B. Attaches to host cell, shape specific (shape determines who

they invade) C. new viruses attach to neighboring cells or particles released to

another host cell D. Copies of viral DNA and capside are made E. Injects DNA or RNA into host cell

3. A mosquito is the vector (organism transmitting) that carries the ____________ that causes malaria.

4. True or False. A microscope is not required to see all microorganisms.

http://health.howstuffworks.com/human-body/systems/immune/immune-system5.htm

Flashcard Warm-up

Flashcard Warm-up

Antigens (the bad guys)

a substance/molecule that, when introduced into the body, triggers the production of an antibody by the immune system

Antibodies (the good

guys) Proteins

produced by immune system cells that fight off the antigens (bad guys)

So, how does our immune system fight off pathogens?

Important words to know:

Antigen: term to describe a foreign invader (like bacteria, viruses,

etc.) AKA the bad guys!

ANTIBODIES are the good guys!

The “bad guys” come in all sorts of sizes and shapes! The “good guys” shapes match the bad guys!

Who are the goodGuys?Who are the bad guys?

T-cells and B-cells are both WHITE BLOOD CELLS!

T-cells: initiate the immune

response by activating B-cells or destroy the pathogenB-cells

A. produce ANTIBODIES, proteins that are specifically shaped to antigensB. memory B cells- remember the correct antibody to protect you the second time you are exposed

Here’s how it works:

Active Immunity: YOUR Immune system responds to foreign invaders

1. antigens have entered body before and your memory B cells already have the antibodies

2. Vaccines: injected with weak or dead portion, memory B cells make antibodies

BIG IDEA!!!! Your body has already made the antibodies to fight this off!

Passive Immunity: is acquired! Antibodies are passed from one person to another Examples:

Mother to child (breast milk, placenta)

Injected serum containing antibodies (anti-venom)

Medicines:

Antibiotics: treat only BACTERIAL infections

Antiviral: interfere with the life cycle of a virus

Anti-fungal: kill the fungus (tough actin’ TINACTIN) for athletes foot

Pain killers: treat only symptoms

Health: a balanced diet provides chemicals for immune response

A. poor nutrition can lead to protein deficiency---

B. Malnutrition: leads to a weak immune system (which means your body can’t make the antibodies)

Flashcard Warm-up

Active Immunity

results when exposure to a disease organism triggers the immune system to produce antibodies to that disease.

Example: vaccinations

Passive Immunity

The short-term immunity that results from the introduction of antibodies from another person or animal.

Example: use of antivenin, a mother breast feeding her baby

Case Questions: Operation Antibody Posters

Case 1: Before the start of the flu season, you have a flu shot. A month later you come down with the flu. What happened?

Case 2: Dangling your legs in the ocean over the side of your raft, you feel a sharp sting on your foot. You look down and discover a jellyfish. Soon your foot feels painful. It is swollen and red to touch. What is happening?

Case 3: You are an immunologist and have a patient who just received a kidney transplant. How do you explain to him that he must be given immunosuppressant drugs?Case 4: As a child you received an emergency shot of antivenin to treat snakebite. The drug was horse serum with antibodies. The doctor told you that these procedures could never be repeated or boosted. Why?

Case 5: Five cases of measles suddenly appear at your high school. The school nurse is rechecking immunization records. What could be a possible explanation for this outbreak? (Hint: there are three possible scenarios)

Case 6: You are hurrying to finish the Biology Honors Project and ….. oops, a splinter from your display ends up in your hand. You pull it out, but later that night your finger becomes swollen and red. A few days later the entire hand is swollen, the pain is intense, and you develop a fever. What’s going on?

Case 7: A friend comes to you and tells you they have the HIV virus. They can only recall having unprotected sex ONE time, which was ten years ago. How did this happen?

Ticket Out the Door

1. ______ are special proteins produced by B cells that fight off pathogens.

2. ____ cells are like the general of an army, they initiate the immune response and tell the “soldiers” what to do.

3. A mother breast feeding her child is an example of ________ immunity.

4. Receiving a vaccination would be an example of _______ immunity because YOUR body is produced the antibodies.