Pearson Chapter 1

A new microorganism has been isolated from hot springs in Yellowstone National Park. It consists of single cells, which appear to lack a nucleus. Chemical analysis shows the presence of both DNA and RNA in the cytoplasm and peptidoglycan in the cell wall. In which of the following groups will this organism be classified?

Bacteria

All of the following are eukaryotes EXCEPT __________.

Bacteria

Which of the following is characteristic of bacteria?

Bacteria lack a membrane-bound nucleus.

All living organisms can be classified into three domains: __________.

Bacteria, Archaea, and Eukarya

Which of the following properties are true of both bacteria and archaea?

Both are characterized as prokaryotes.

Which of the following properties are true of both bacteria and viruses?

Both use a molecule of nucleic acid to determine heredity.

Which of the following is true of scientific names assigned to living organisms?

The scientific name is always underlined or italicized.

Why are viruses not classified as prokaryotes or eukaryotes?

They need a host to survive, thus are not considered alive.

Which of the following best describes gene therapy?

Use of a harmless virus to insert a gene in a host cell

Microbes are NOT responsible for __________.

antibody production

Only a small percentage of microbes __________.

cause disease

In the scientific name Escherichia coli, Escherichia is the __________.

genus name

Algae are __________.

photosynthetic and classified as eukaryotes

All of the following describe a major feature used to classify organisms into to three domains (Bacteria, Archaea, and Eukarya) EXCEPT __________.

presence or absence of DNA

Biofilms are commonly found in which of the following environments?

*All* of the listed responses are correct: A rock in a lake Teeth Water pipes Medical devices

Which of the following processes are beneficial activities of microorganisms?

*All* of the listed responses are correct: Recycling elements in the environment Decomposing sewage Producing foods and chemicals

Which of the following is NOT a characteristic of Archaea?

*Use of a harmless virus to insert a gene in a host cell* Use of microbes for bioremediation Use of microbes to control pests Use of microbes to recycle nitrogen from the air into the soil

Which of the following is a scientific name?

Legionella pneumophila

__________ is the study of protozoa.

Parasitology

Which of the following types of microorganism and its description are NOT correctly matched?

Protozoa—small animals