Exam 16: Microbial Life: Prokaryotes and Protists

The bacteria Pseudomonas aeruginosa produces a protein that is secreted into its environment. The protein inhibits synthesis of elongation factor 2 (another protein)in humans. This effect may sound dangerous, but it has been considered as a possible treatment for hepatitis B. The protein produced by P. aeruginosa is a/an ________.

Which two groups of protists produce hard, mineralized skeletal structures or cell walls that contribute to marine sediments and form fossils?

In 2012, scientists studied modern Marchantia liverwort plants and observed that they not only are able to make their own food using energy from sunlight but also absorb chemical nutrients from plant material in aquatic environments. They classified this plant as a

When hermit crabs crawl across the ocean floor, they often have sea anemones attached to their backs. The anemones use their dangerous tentacles to keep hermit crab predators at bay, and they dine on the particles of food that the crab does not eat. This is an example of

Which of the following causes food poisoning and typhoid fever?

Unlike archaean and eukaryote cell walls, bacterial cell walls contain a unique substance called

You culture the dried soup from a 4,000-year-old cooking pot found in an Egyptian tomb and obtain a distinctive species of prokaryote. You immerse a test tube of these bacteria in boiling water for several hours, but the colony grows back. This species is probably

Some white blood cells are able to surround and ingest bacteria. Which of the following would you expect to see as part of the blood cell structure?

Kelp, a seaweed that is anchored to the seafloor by rootlike structures and can grow to heights of 60 m, is a kind of

A patient visits her doctor complaining of stomach cramps, vomiting, and nausea. When he takes a bacterial sample, he determines that Escherichia coli bacteria have used their ________ to attach to the cells lining her gastrointestinal tract.

Which of the following statements about archaea is false?

Intestinal gas is evidence of active ________ in one's digestive tract.

Humans are an example of

Which of the following groups includes protists that reside within the cells of corals?

After reading the paragraphs below, answer the questions that follow. Textile mills often release dye color and toxic by-products into rivers and streams, which may then taint groundwater. Fungi associated with mangrove trees have been shown to reduce both colors and toxicity in tainted groundwater. -Suppose that in 1990, fungal treatment was added to stream water contaminated from a textile mill. The toxins in the water tend to lower pH levels, and scientists wanted to study how adding the fungal treatment affected stream pH levels. pH levels were recorded every year for five years. Results indicated that the acidity of the stream water decreased from pH 2.5 in the first year to pH 5.9 by the fifth year. Scientists concluded that

Rod-shaped bacteria are called

Compost piles create an intense heat source and would therefore be suitable environments for ________.

You take a 1-mL sample of pond water and add it to a colorless, viscous media in a small petri dish. When you place it under your dissecting microscope, you see three organisms. Two are struggling to move efficiently through the media, while the third moves more quickly. You attribute the faster movement to the third organism's

According to the figure, green alga resulted from ________, and Euglena resulted from ________.

A slimy layer of bacteria coating a surface is also known as a ________.