26. Prokaryotes

Which of the following groups of prokaryotes is classified as a member of the domain Archaea?

Which subgroup of proteobacteria contains many species that are closely associated with eukaryotic hosts in mutualistic or parasitic relationships?

Portions of the genomes of certain prokaryotic species are very similar to portions of the genomes of distantly related prokaryotes. The process that most likely accounts for this genetic similarity is __________.

Which group of bacteria is unusual in that they lack peptidoglycan in their cell walls?

Prokaryotes found inhabiting the Great Salt Lake would be __________.

Which clade of archaea includes most of the extreme thermophiles?

Scientists hypothesize that the O157:H7 strain of E. coli is so different from the K-12 strain because of __________.

Which of the following is a difference between bacteria and archaea?

Which of the following correctly describe an exergonic reaction? Select True or False for each statement.T/F The products have lower Gibbs free energy than the reactants.T/F Activation energy is required for the reaction to proceed.T/F The products always have lower entropy than the reactants.T/F The reaction always occurs quickly.

Which of the following statements is not true?a. Archaea and bacteria have different membrane lipids.b. The cell walls of archaea lack peptidoglycan.c. Only bacteria have histones associated with DNA.d. Only some archaea use CO2 to oxidize H2, releasing methane.

How does pH affect enzyme-catalyzed reactions?a. Protons serve as substrates for most reactions.b. Energy stored in protons is used to drive endergonic reactions.c. Proton concentration increases the kinetic energy of the reactants, enabling them to reach their transition state.d. The concentration of protons affects an enzyme's folded structure and reactivity.

What factors determine whether a chemical reaction is spontaneous or not?

Evaluate these statements about Koch's postulates, which are used to establish a causative link between a specific microbe and a specific disease. Select True or False for each statement.T/FThe microbe must be present in individuals suffering from the disease and absent from healthy individuals.T/FThe microbe must be isolated and grown in pure culture.T/FIf organisms from the pure culture are injected into a healthy experimental animal, the disease symptoms should appear.T/FThe microbe does not have to be isolated from the experimental animal as long as the disease is present.

On examining cells under a microscope, you notice that they occur singly and have no evidence of a nucleus. These cells must belong to a a.domain Eukarya;b. domain Bacteria;c. domain Archaea;d. the Protista;e. more than one of the above could be correct

Plantlike photosynthesis that releases O2 occurs ina. cyanobacteria.b. archaea.c. gram-positive bacteria.d. chemoautotrophic bacteria.