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Lesson Worksheet: Pathogens and Disease Biology
In this worksheet, we will practice describing examples of communicable diseases in plants and animals, and outlining their impact on society.
True or False: Most bacteria are pathogenic.
True or False: Globally, most human deaths are caused by communicable diseases.
Which of the following statements about viruses is not true?
- AViruses can only reproduce inside a living cell.
- BAll naturally occurring viruses are pathogenic.
- CViruses are smaller and less complex than bacteria.
- DViruses mutate and evolve more slowly than bacteria.
- EBacteriophages are viruses that infect bacteria.
Cells can be prokaryotic or eukaryotic.
Which of the following types of pathogens has a prokaryotic cell structure?
Not all pathogens are considered to be organisms.
Which of the following types of pathogens could be considered to be nonliving?
Some diseases can be passed from animals to humans.
Which term describes a disease that normally exists in animals but can mutate and infect humans?
Which pathogen has moved from animals to infect humans and caused disease?
- AHuman influenza A
The figure compares the global mortality rates of two viral infections, influenza (flu) and COVID-19.
Using the data provided, state whether the following conclusions are true or false.
Older people are more likely to die from COVID-19 than from the flu.
The overall death rate from COVID-19 is higher than the flu.
It is not possible to make specific age comparisons using the data provided.
Some communicable diseases involve vectors.
What is the role of a vector in a communicable disease?
- AIt is contaminated clothing that may cause the spread of disease.
- BIt is an injection that makes you immune to a disease.
- CIt is an organism that causes disease.
- DIt is an organism that carries pathogens from one organism to another.
Malaria is a disease that affects over 200 million people every year. Controlling its vector is the key to limiting its spread. What is the vector for this disease?
- CSand flies
The figure shows data from the WHO on the prevalence of tuberculosis (TB), a bacterial disease caused by Mycobacterium tuberculosis, and HIV in African countries.
What is the relationship between these two diseases?
- AThere is no correlation between the prevalence of the two diseases.
- BThere is a negative correlation between the prevalence of the two diseases.
- CThere is a positive correlation between the prevalence of the two diseases.
What is an explanation for the relationship shown in the figure?
- AHIV also infects and damages the lungs.
- BHIV suppresses the immune system.
- CHIV infects M. tuberculosis, making it more infectious.
- DHIV prevents the antibiotic treatment for TB from working.
The figure shows pathogenic bacteria of different shapes.
Which letter represents Vibrio cholerae, the bacterium that causes cholera?
Which letter represents Staphylococcus aureus, the bacterium that causes MRSA infection?
Which letter represents Bacillus anthracis, the bacterium that causes anthrax?
The figure shows the life cycle of Plasmodium, the Protoctista that causes malaria. A plasmodium alternates between a mosquito and a human host.
How does this Protoctista cause damage to the cells in both hosts? Use the figure to help you.
- ABy digesting the contents of the cells and reproducing inside them
- BBy taking over the cells’ metabolism using its own genetic material
- CBy releasing enzymes that digest cells
- DBy producing toxins that poison the host cells