Why is it more likely that coincidental homologies (i.e., similarities that are just by chance) are statistically more likely to occur with DNA than protein comparisons between species?
What will be an ideal response?
This is because there are only four nucleotides in DNA versus twenty amino acids in proteins. Therefore, it is less likely for coincidental homologies to occur when comparing proteins and thus, proteins are more commonly compared.
By comparing the amino acid sequence of a protein among several species, the number of amino acid differences can be used as a measure of relative relatedness.
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The purpose of the fermentation process is the
A) regeneration of NAD+. B) generation of additional energy in the form of ATP. C) generation of additional reducing equivalents. D) production of novel compounds, such as inorganic acids. E) all of the above
Cervical swab is:
a. acceptable. b. not acceptable.
A neuron and a nerve differ in that
A. nerves are bundles of fibers and neurons are single cells. B. neurons carry impulses and nerves do not. C. neurons are found in the peripheral nervous system only. D. nerves are attached to neurons.
Which of the following antibiotics is (are) produced by actinoplanetes?
A. Nalidixic acid B. Gentamicin C. Penicillin D. Cycloserine