bio test revision Flashcards
in a smoking demo, what change should be seen in the lime water and why?
Clear to cloudy because of a presence of carbon dioxide.
In a smoking demo, what change should be seen in the cotton wool and why
From white to light-brown/yellow from the tar.
What is a disinfectant?
A compound used to kill bacteria in the environment around us.
What is an antibiotic?
A compound that is safe to use inside our bodies, used to kill bacteria or prevent them from growing.
What is an antiseptic?
A compound that is safe to use of the surface of human skin which kills bacteria.
What is your health?
Your state of physical and mental well being, not just an absence of disease.
What is the difference between communicable and non-communicable diseases?
Communicable diseases can spread from one person to another and is caused by pathogens like bacteria or virus but non-communicable diseases cannot be transmitted from one person to another.
Other than communicable and non-communicable diseases, what other factors can be a cause of ill-health?
Diet , life situations, lack of control and stress levels.
What does the immune system do in term of pathogens?
Destroys them.
What are microorganisms that cause disease called?
Pathogens.
Some communicable diseases can be transferred between different species of organism (infected dogs or bats, for instance, can pass rabies to humans) True or False?
True.
What is the difference between bacteria and virus?
-Bacteria is a singe-celled living organisms.
-Some bacteria can be used to make foods, treat sewage or make medicines.
-They are important in the human body.
-Viruses are smaller than bacteria.
-Viruses cause disease in every type of living organism.
-They usually have a regular shape.
In steps, how do viruses take over the cells of your body?
Step 1-Virus attaches to cell.
Step 2-Virus enters the cell.
Step 3-Virus’s genetic material takes over the host’s cell’s nucleus.
Step 4-New virus parts are made by the host cell.
Step 5-The new viruses break out of the cell, destroying it, to then go and take over another cell.
What are three chemical barriers of a plant defense?
-poisons
-antibacterial secretions
-anti fungal secretions
What is the zone of inhibition
-The area around the antiseptic that didnt produce any bacteria
-Large zone = more effective antiseptic
