Which of these deeply branching bacteria is considering a polyextremophile?

A. Aquifex pyrophilus
B. Deinoccus radiodurans
C. Staphylococcus aureus
D. Mycobacterium tuberculosis


Ans: D. Mycobacterium tuberculosis

Biology & Microbiology

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The site-specific recombinases are similar to topoisomerases in what way?

A. They introduce supercoils. B. They require ATP hydrolysis for their activity. C. They promote phosphoryl group transfers in which the net change in free energy is close to zero. D. They also assist in compaction of the DNA. E. They mediate strand invasion reactions.

Biology & Microbiology

Which of the following is a disadvantage to expressing genes in E. coli?

A. Bacteria containing recombinant genes rarely will grow in commercial fermenters. B. Some eukaryotic proteins will not fold properly when expressed in E. coli. C. Efficient methods exist for transforming DNA into the bacteria but not for extracting DNA. D. The regulatory sequences that govern gene expression are not well understood and rarely express cloned genes at high levels. E. Host bacteria are difficult and expensive to grow.

Biology & Microbiology

In salt marshes, only a small portion of primary production is consumed by herbivores

Indicate whether the statement is true or false

Biology & Microbiology

Which Ecdysozoan phylum contains members that have a segmented body encased in a rigid exoskeleton made of chitin plus other materials?

a. Annelida b. Nemertea c. Nematoda d. Arthropoda

Biology & Microbiology