Immune System I
What is the main function of the immune system?
To fight off infections and diseases
The human body fights an infection when a pathogen is detected. As a result, the pathogen stimulates the production of
antibodies
Which statement is most closely related to the modern theory of evolution?
Organisms best adapted to a changed environment are more likely to reproduce and pass their genes to offspring.
When is extinction of a species most likely to occur?
when environmental conditions change and the members of the species lack adaptive traits to survive and reproduce
What does the human body produce in response to a detected pathogen?
Antibodies
The role of antibodies in the human body is to
Recognize foreign antigens and mark them for destruction/ Identify outside bacteria or viruses.
Woolly mammoths became extinct thousands of years ago, while other species of mammals that existed at that time still exist today. These other species of mammals most likely exist today because, unlike the mammoths, they
had certain inheritable traits that enabled them to survive
Why did woolly mammoth population go extinct at the end of the ice age?
because the temperature become too warm and they were not adjusted to the changing environment.
What is the primary role of antibodies in the human body?
Recognize foreign antigens and target them for destruction
White blood cells are most closely associated with which two body systems?
immune and circulatory
The teeth of carnivores are pointed and are good for puncturing and ripping flesh. The teeth of herbivores are flat and are good for grinding and chewing. Which statement best explains these observations?
The two types of teeth most likely evolved as a result of natural selection.
What triggers an immune response in the body?
Foreign antigens/ diseases/ pathogens/ harmful bacteria
Antibodies produced against one pathogen infecting the human body may not work against a different pathogen because antibodies are...
specific for a particular pathogen/ disease/ infection
Mutations can be beneficial to a species because they...
can lead to having traits that are favorable in a changing environment
In 1995, during an Ebola virus outbreak, approximately 80% of the infected individuals died. Which statement is an inference that could be made based on this information?
The individuals who survived were able to produce antibodies against the Ebola virus.
Within ten years after the introduction of a new mosquito spray, very few of the descendants of the targeted mosquito populations were killed by the usual dose of the spray. The best explanation for this is that
existing variations in the mosquito population provided resistance to the spray