Exam 15: The Evolution of Microbial Life

Food poisoning from Salmonella occurs because of ________.

Whose experiments demonstrated that,given the conditions on the primitive Earth,biological monomers could arise spontaneously?

Endosymbiosis explains the origin of the ________ of eukaryotes.

Animal life underwent its greatest diversification during the ________,which began about ________ million years ago.

All organisms that photosynthesize fit into which nutritional category?

Which protozoan group consists solely of parasitic forms?

A photoautotrophic unicellular organism with a shell made of silica is most likely a(n)________.

-If you were to view this organism with the right microscope you could see that the entire stalk is covered with smaller hairs than the ones on the opening.What might be the function of these smaller hairs on the stalk?

Spherical bacteria that occur in clusters are ________.

All of the following are true EXCEPT one.Choose the exception.

RNAs that can act as enzymes are called ________.

________ are responsible for toxic red tides.

In the soil,some ________ help to decompose dead organisms and other waste materials,returning vital chemical elements such as nitrogen to the environment.

Large amounts of oxygen gas appeared in Earth's atmosphere about ________ years ago.

Which of the following is a colonial form of green algae?

Which of the following would likely be the most difficult to kill if you were you to can your own food?

-In the image above,the aquatic organism moves using flagella.It is parasitic and can colonate and reproduce in the human intestine.What type of organism could this be?

According to the theory of endosymbiosis,which organelles evolved from small prokaryotes that established residence within other,larger prokaryotes?

Read the following scenario to answer the following question(s). Malaria is a disease caused by parasitic protists in the genus Plasmodium. The parasite is transmitted to humans by female Anopheles mosquitoes. The Plasmodium parasite feeds on human red blood cells, eventually destroying them. Humans infected with malaria can exhibit many symptoms. Depending on the severity of the infection, these can range from fever, chills, sweating, and headaches to anemia and kidney failure. Ultimately, malaria can result in death. However, if time and money permit, once a person is infected, they can be treated with different antimalarial drugs. Two commonly used drugs are artemisinin and quinine. In addition, one way to prevent the spread of malaria is to apply pesticides to treat areas with Anopheles mosquitoes. The National Malaria Eradication Program began work in 1947 with the goal of eliminating malaria from the southern United States. In 1947, 15,000 cases of malaria were reported nationwide. By 1950, only 2,000 cases were reported, and by 1951, malaria was considered eradicated from the United States. Today, the disease is most common in Africa and South America, two continents that are highly impoverished. About one million people die from malaria every year, many of them children. In Africa, it is estimated that one in every five childhood deaths is due to malaria. -A vector is an organism that transfers a pathogen to a host.In the case of malaria,the vector(s)is (are)________.

Which of the following are most closely related to plants?