Exam 15: The Evolution of Microbial Life

Prokaryotes reproduce by means of ______.

According to this evolutionary tree,the archaea and eukaryotes last shared a common ancestor ______.

Which of the following has an organization that may be similar to an evolutionary stage between unicellularity and multicellularity?

Variation among pre-cells was due to ______.

Which protozoan group consists solely of parasitic forms?

Eukaryotes arose about ______ years after the first prokaryotes.

What was the first stage of the process that led to the abiotic origin of life?

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

Eukaryotes that are not fungi,animals,or plants are classified in a "catch-all" category called ______.

Under ideal conditions,prokaryotes are capable of reproducing at a(n)______ rate.

You discover a unicellular organism that moves by what appear to be pseudopodia. You conclude that this organism is ______.

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

RNAs that can act as enzymes are called ______.

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

Which prokaryotic group is most closely related to eukaryotes?

The idea that life regularly arises from nonliving matter is referred to as ______.

Which of the following prokaryotes aid digestion in cattle,deer,and other animals that obtain nutrition from cellulose?

______ are responsible for toxic red tides.

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. The two most commonly used drugs are artemisinin and quinine. In addition, one way to prevent the spread of malaria is to treat areas with Anopheles mosquitoes with pesticides. 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. 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. -Which of the following statements is true?

Which of the following is NOT true?