Which of the following cell wall components is unique to gram-negative cells?

A. lipopolysaccharide
B. teichoic acid
C. mycolic acid
D. peptidoglycan


Ans: A. lipopolysaccharide

Biology & Microbiology

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Which of the following contribute(s) to the differences between the Archaea and the bacteria?

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Gibberellins were discovered as a result of:

A. extractions of this hormone from plants B. a fungal disease on rice C. an application of the hormone accidentally D. many years of experiments to isolate it from plants E. discovery of its relationship to auxins

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Which of the following most directly gives rise to primary vascular tissues?

a. protoderm b. apical meristem c. ground meristem d. vascular cambium e. procambium

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