Answer the following multiple choice question and explain. B IS NOT THE ANSWER. Numerical taxonomy for bacteria requires: (a) that the tests used have a clear positive or negative outcome. (b) that the results can be compared to the results on the same lest for an organism whose name is known, (c) that the shape and gram stain of the organisms is known, (d) that the laboratory has access to instruments mat will allow rapid testing of multiple factors, A. B and D, A, B. and C, B, C, and D. Solution Numerical taxonomy differentiates micro-organisms especially bacteria based on their phenotypic characteristics (phenotypes means appearance of the organisms example include gram stain reaction, shape and size of bacteria, if bacteria can propel, it\'s ability to grow in presence or absence of oxygen, nutrient type used) This correct option is therefore c) that the shape and gram stain of the organism is known..

1. 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.