Archaeal vs bacterial flagella Flagellar motility is widespr

Archaeal vs. bacterial flagella Flagellar motility is widespread in both Archaea and Bacteria. The introductory passage references findings that some archaeans (Methanocaldococcus) swim faster than E.coli bacteria, and some (Halobacterium) are slower. The wide range of speeds may indicate that flagellar motility is an example of convergent evolution. What are some other similarities or differences between archaeal and bacterial flagella? Select all that apply. Select all that apply.

Archaeal flagella are made of flagellin proteins unrelated to those seen in bacterial flagella.

Archaeal flagella are powered directly by ATP, but bacterial flagella are powered by a proton-motive force.

Archaeal flagella are about half as wide as bacterial flagella.

Archaeal flagella are about twice as long as bacterial flagella.

Flagella propel archaeans by contracting and lengthening, but flagella propel Bacteria by rotating.

(The answer is not a and b)

Solution

Archaeal flagella are made of flagellin proteins unrelated to those seen in bacterial flagella (they share similarities with type-IV secretion system and pilin proteins of bacteria rather than the flagellin).

Archaeal flagella are powered directly by ATP, but bacterial flagella are powered by a proton-motive force.

Archaeal flagella are about half as wide as bacterial flagella.