Q: A student claims that commensalism always benefits both organisms. Which of the following equations best represents the correct relationship for commensalism?

$$\text{Organism 1: Benefits},\ \text{Organism 2: Neither benefits nor is harmed}$$

Q: Which equation best represents the relationship in parasitism?

$$\text{Organism 1: Benefits},\ \text{Organism 2: Is harmed}$$

Question 1

Which type of symbiotic relationship is represented when bacteria in the human colon benefit the host and themselves?

Accepted Answer

Mutualism

Question 2

A fungus secretes an antibiotic that inhibits the growth of nearby bacteria. What type of symbiotic relationship is this?

Accepted Answer

Amensalism

Question 3

Which of the following best describes commensalism?

Accepted Answer

One organism benefits, the other is neither harmed nor benefited

Question 4

Tuberculosis bacteria in the human lung represent which type of symbiotic relationship?

Accepted Answer

Parasitism

Question 5

Wood-eating termites depend on protozoa in their intestines to digest cellulose. Which type of symbiosis does this represent?

Accepted Answer

Mutualism

Question 6

If a mite lives in human hair follicles without affecting the human, what type of symbiotic relationship is this?

Accepted Answer

Commensalism

Question 7

Which symbiotic relationship is characterized by one organism being harmed while the other is unaffected?

Accepted Answer

Amensalism

Question 8

A patient is infected with a bacterium that benefits from the host while causing harm. Which symbiotic relationship is this?

Accepted Answer

Parasitism

Question 9

Which of the following is an example of mutualism?

Accepted Answer

Bacteria in human colon

Question 10

In which symbiotic relationship do both organisms benefit?

Accepted Answer

Mutualism

Question 11

Which symbiotic relationship is most likely to be observed when an organism produces a substance that inhibits another organism without benefiting itself?

Accepted Answer

Amensalism

Question 12

A protozoan in a termite's gut digests cellulose, allowing the termite to obtain nutrients. What is the best description of this relationship?

Accepted Answer

Mutualism

Question 13

Which of the following is NOT a characteristic of mutualism?

Accepted Answer

One organism is harmed

Question 14

If an organism benefits from another without affecting it, which term best describes this relationship?

Accepted Answer

Commensalism

Question 15

Which symbiotic relationship is most likely to result in disease in the host organism?

Accepted Answer

Parasitism

Question 16

A scientist observes that a bacterium produces a compound that kills nearby bacteria but does not affect itself. What type of symbiosis is this?

Accepted Answer

Amensalism

Question 17

Which of the following relationships involves one organism benefiting and the other being harmed?

Accepted Answer

Parasitism

Question 18

Which symbiotic relationship is most likely to be observed in the human gut with bacteria that aid digestion?

Accepted Answer

Mutualism

Question 19

A student claims that commensalism always benefits both organisms. Which of the following equations best represents the correct relationship for commensalism?

Accepted Answer

$$	ext{Organism 1: Benefits},\ 	ext{Organism 2: Neither benefits nor is harmed}$$

Question 20

Which equation best represents the relationship in parasitism?

Accepted Answer

$$	ext{Organism 1: Benefits},\ 	ext{Organism 2: Is harmed}$$

Understanding Types of Symbiotic Relationships in Microbiology

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