Question 1

Where in a diatom would you find their yellowish photosynthetic pigment?

Accepted Answer

The photosynthetic pigment in diatoms is called fucoxanthin and is found in specialized plastids called chromatophores, which are similar to chloroplasts. Therefore, the correct answer is E, In chloroplasts.

Question 2

Trichonympha is a unicellular flagellated protist that lives within termites and allows the termite to be able to "digest" wood.Trichonympha is which of the following?

Accepted Answer

The answer of Trichonympha is a unicellular flagellated protist that...

Question 3

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferans are an example of which of the following?

Accepted Answer

Foraminiferans are a type of protozoa, which are single-celled eukaryotes that typically move by pseudopodia and feed by phagocytosis.

Question 4

Entamoeba histolytica can cause amoebic dysentery.It moves using pseudopodia,can only feed by phagocytosis and is unicellular.Entamoeba histolytica is which of the following?

Accepted Answer

Entamoeba histolytica belongs to the phylum Sarcomastigophora, which includes unicellular organisms with flagella or pseudopodia, such as protozoa. Algae are photosynthetic and multicellular or colonial, slime molds are multicellular fungi-like organisms, diatoms are unicellular photosynthetic organisms with shells, and apicomplexans are unicellular parasites with complex organelles called apical complexes.

Question 5

How might global climate change affect the distribution of malaria?

Accepted Answer

As temperatures rise and precipitation patterns change with global climate change, the range of mosquitoes that can transmit malaria is likely to expand into new regions. This could increase the geographic distribution of malaria, as more people would be at risk of contracting the disease.

Question 6

Diatoms are a type of algae,but with a hard silica shell.Which of the following structures would you expect to find directly underneath the silica shell?

Accepted Answer

A cell wall would be present directly underneath the silica shell of a diatom. This cell wall is composed of organic material and is responsible for maintaining the shape and rigidity of the cell.

Question 7

Chlamydomonas is multicellular,produces motile haploid sperm,and is photosynthetic.Chlamydomonas is which of the following?

Accepted Answer

Chlamydomonas is a genus of green algae, which are photosynthetic, multicellular organisms that produce motile haploid sperm. Therefore, the best choice is E.

Question 8

Malaria is caused by Plasmodium falciparum,a non-motile protist that contains a cluster of microtubules at one end of the cell.Once injected into the blood stream,these microtubules are used to attach to red blood cells.Malaria is transmitted by:

Accepted Answer

Malaria is mainly transmitted through the bite of an infected mosquito. The female Anopheles mosquito is the most common mosquito responsible for transmitting malaria. The other options (A, C, D, and E) are associated with the transmission of other diseases, such as sleeping sickness, leishmaniasis, Chagas disease, and foodborne illnesses.

Question 9

Trichonympha is a unicellular flagellated protist that lives within termites and allows the termite to be able to "digest" wood.Trichonympha is which of the following?

Accepted Answer

Trichonympha is a heterotroph, meaning it obtains its food by consuming other organisms. It does not produce its own food through photosynthesis (autotroph) or consume decaying organic matter (detritovore).

Question 10

One reason that malaria continues to be the world's most significant infectious disease is because Plasmodium falciparum continues to develop resistance to the drugs that have been used to treat malaria.This is due to which of the following?

Accepted Answer

Plasmodium falciparum can develop resistance to antimalarial drugs through pre-existing mutations that allow them to survive despite drug treatment. Over time, these resistant parasites can become dominant in a population and render drug treatment ineffective.

Question 11

Malaria is caused by Plasmodium falciparum,a non-motile protist that contains a cluster of microtubules at one end of the cell.Once injected into the blood stream,these microtubules are used to attach to red blood cells.In areas of the world where malaria is endemic people have a relatively high incidence of the allele for:

Accepted Answer

People with sickle cell trait (one copy of the sickle cell allele) are less susceptible to severe malaria because the deformed red blood cells caused by sickle cell trait make it more difficult for the malaria parasite to attach and multiply within the cells. Therefore, in areas where malaria is endemic, there is a higher frequency of sickle cell allele carriers. Blue eyes, cystic fibrosis, mental retardation and hemophilia are not known to have any correlation with susceptibility to malaria.

Question 12

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferan shells are made of which of the following?

Accepted Answer

Foraminiferan shells are primarily composed of calcium carbonate.

Question 13

Cryptosporidium is an apicomplexian that can contaminate water supplies.Which of the following would you predict to be the case of a Cryptosporidium outbreak?

Accepted Answer

Cryptosporidium forms oocysts rather than spores, but these are resistant to disinfectants such as chlorine, making it difficult to treat and prevent waterborne outbreaks. Other options are incorrect because Cryptosporidium is nonmotile, not photosynthetic, and does not have flagella or enter through the respiratory tract.

Question 14

African sleeping sickness is caused by Trypanosoma brucei,a unicellular flagellated protist infects red blood cells after being injected into the blood stream.African sleeping sickness is transmitted by:

Accepted Answer

African sleeping sickness is primarily transmitted through the bite of the tsetse fly, which is a blood-sucking insect found in sub-Saharan Africa. This fly is the main vector for the trypanosomes that cause the disease.

Question 15

Dictyostelium discoideum is an unusual organism,one that straddles the boundary between the unicellular and the multicellular.Its feeding phase consists of individual amoeba-like cells that move independently,feeding on bacteria by phagocytosis.When the food runs out,cells begin to aggregate into a multicelled structure that migrates toward light.The cells differentiate into a base,stalk,and spores; only the spores survive to colonize a new habitat.What is the advantage of forming spores?

Accepted Answer

Spores are smaller and can be transported to new habitats, allowing for the spread and survival of the organism in different environments. The other options are not supported by the characteristics of Dictyostelium discoideum.

Question 16

Euglena and dinoflagellates have chloroplasts and flagella.This means they are which of the following?

Accepted Answer

Euglena and dinoflagellates are both photosynthetic and mobile organisms that have both chloroplasts and flagella.

Question 17

Dictyostelium discoideum is an unusual organism,one that straddles the boundary between the unicellular and the multicellular.Its feeding phase consists of individual amoeba-like cells that move independently,feeding on bacteria by phagocytosis.When the food runs out,cells begin to aggregate into a multicelled structure that migrates toward light.The cells differentiate into a base,stalk,and spores; only the spores survive to colonize a new habitat.Dictyostelium discoideum is which of the following?

Accepted Answer

Dictyostelium discoideum is a heterotroph, as it feeds on bacteria by phagocytosis during its unicellular phase before aggregating into a multicelled structure. It is not an autotroph, as it cannot produce its own food, nor is it a detritovore, as it does not feed on dead and decaying matter.

Question 18

Malaria is caused by Plasmodium falciparum,a non-motile protist that contains a cluster of microtubules at one end of the cell.Once injected into the blood stream,these microtubules are used to attach to red blood cells.Plasmodium falciparum is which of the following?

Accepted Answer

Plasmodium falciparum is an apicomplexan, a type of protist that is characterized by the presence of a complex of microtubules at one end of the cell.

Question 19

African sleeping sickness is caused by Trypanosoma brucei,a unicellular flagellated protist infects red blood cells after being injected into the blood stream.Trypanosoma brucei is which of the following?

Accepted Answer

Trypanosoma brucei is a unicellular flagellated protist, which falls under the category of protozoans.

Question 20

Dictyostelium discoideum is an unusual organism,one that straddles the boundary between the unicellular and the multicellular.Its feeding phase consists of individual amoeba-like cells that move independently,feeding on bacteria by phagocytosis.When the food runs out,cells begin to aggregate into a multicelled structure that migrates toward light.The cells differentiate into a base,stalk,and spores; only the spores survive to colonize a new habitat.Dictyostelium discoideum is which of the following?

Accepted Answer

Dictyostelium discoideum is a type of slime mold, which straddles the boundary between the unicellular and the multicellular.

Quiz 17: Protists

Where in a diatom would you find their yellowish photosynthetic pigment?

Trichonympha is a unicellular flagellated protist that lives within termites and allows the termite to be able to "digest" wood.Trichonympha is which of the following?

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferans are an example of which of the following?

Entamoeba histolytica can cause amoebic dysentery.It moves using pseudopodia,can only feed by phagocytosis and is unicellular.Entamoeba histolytica is which of the following?

How might global climate change affect the distribution of malaria?

Diatoms are a type of algae,but with a hard silica shell.Which of the following structures would you expect to find directly underneath the silica shell?

Chlamydomonas is multicellular,produces motile haploid sperm,and is photosynthetic.Chlamydomonas is which of the following?

Malaria is caused by Plasmodium falciparum,a non-motile protist that contains a cluster of microtubules at one end of the cell.Once injected into the blood stream,these microtubules are used to attach to red blood cells.Malaria is transmitted by:

Trichonympha is a unicellular flagellated protist that lives within termites and allows the termite to be able to "digest" wood.Trichonympha is which of the following?

One reason that malaria continues to be the world's most significant infectious disease is because Plasmodium falciparum continues to develop resistance to the drugs that have been used to treat malaria.This is due to which of the following?

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferan shells are made of which of the following?

Cryptosporidium is an apicomplexian that can contaminate water supplies.Which of the following would you predict to be the case of a Cryptosporidium outbreak?

African sleeping sickness is caused by Trypanosoma brucei,a unicellular flagellated protist infects red blood cells after being injected into the blood stream.African sleeping sickness is transmitted by:

Euglena and dinoflagellates have chloroplasts and flagella.This means they are which of the following?

Malaria is caused by Plasmodium falciparum,a non-motile protist that contains a cluster of microtubules at one end of the cell.Once injected into the blood stream,these microtubules are used to attach to red blood cells.Plasmodium falciparum is which of the following?

African sleeping sickness is caused by Trypanosoma brucei,a unicellular flagellated protist infects red blood cells after being injected into the blood stream.Trypanosoma brucei is which of the following?