ame: Class: Date Bio 341 Exam3 d. purple; peptidoglycan e. purple; polysaccharid

Question

ame: Class: Date Bio 341 Exam3 d. purple; peptidoglycan e. purple; polysaccharides Figure 25-1 JA 34. In the accompanying figure, what would structure A be made up as a gram-negative bacterium? a. cellulosae b. plasmids d. peptidoglycan e. monosaccharides 35. Sea snakes, which are reptiles, are similar in body form to eels, which are fish. Sea snakes and eels therefore demonstrate: a. role reversal. b. ancestral traits e homologous traits d. divergent evolution e. convergent evolution 36. What is a chain of round bacteria called? a bacilli b.spirilla c. diplococci d. streptococci e streptobacilli 37. Which classification level contains the greatest number of species? a class Page 7 Copyright Cengage Leaning. Powered by Cognero

Explanation / Answer

Peptidoglycan

The peptidoglycan portion of the Gram-negative cell wall is generally 2-3 nanometers (nm) thick and contains just 2-3 layers of peptidoglycan. Chemically, only 10 to 20% of the Gram-negative cell wall is peptidoglycan.

Sea snake are reptiles, are similar in body to eels which are fish sea snake and eels therefore demonstrate

convergent evolution

Convergent evolution is the process in which organisms that are not closely related independently evolve similar features. Adaptions may take the form of similar body forms, colors, organs and other adaptions which make up the organism’s phenotype.

streptococcus are the bacteria arranged in chain of cocci

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