Exam 25: Bacteria, Archaea, and Viruses

Refer to the figure, which shows the phylogenetic tree of major groups of living organisms. Based on the figure, which statement about the endosymbiotic origin of eukaryotic mitochondria is true?

Gram-negative, rod-shaped bacteria

Which of the following is a broad nutritional category of prokaryotes that is recognized by biologists?

Hundreds of different antibiotics are produced by members of the genus

Ninety percent of the cells in the human body are microbes-mostly prokaryotes and some microscopic eukaryotes.Which statement about human microbiomes is true?

Many Gram-negative bacteria that cause disease have _______ composed of lipopolysaccharides, which can cause fever and vomiting when the bacteria burst.

Refer to the figure. Label the three basic shapes of bacteria shown.

When building phylogenetic trees, scientists approach the task by using single gene sequences, multiple gene sequences, or _______ gene sequences.

A strain of heat-tolerant pathogenic bacteria has acquired resistance to all known antibiotics.Which method would you propose to best control its future spread?

Prokaryotic cells do not possess

Which statement about peptidoglycan is true?

Bioluminescence

Some biologists do not consider viruses to be a form of life because they

Medications and environmental influences that destroy numerous microbes in the human body would

Which of the following is not a reason that ribosomal RNA is useful for studying the evolutionary relationships among living organisms?

Viruses are difficult to control with antiviral medications, because

The genetic makeup of many viruses supports the hypothesis that they are derived from "escaped" cellular components.Judging from its genetic makeup, the virus most likely derived from an "escaped" cellular component is a

Bacteria that lack cell walls, are mostly plant and animal parasites, and are among the smallest cellular creatures are

Refer to the figure, which shows a variety of viruses. According to the figure, which statement about viruses is true?

Which of the following is not one of Koch's postulates for determining whether a particular microorganism causes a particular disease?