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
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Which organism causes the highest number of sexually transmitted diseases each year?
A) Neisseria gonorrhoeae B) Treponema pallidum C) Chlamydia trachomatis D) Trichomonas vaginalis
Which of the following contribute(s) to the differences between the Archaea and the bacteria?
A. Archaea differ from bacteria in their tRNA composition, ribosome structure, and antibiotic sensitivity. B. Archaea have isopranyl glycerol ethers rather than fatty acid esters in their membrane lipids. C. Archaea lack muramic acid. D. All of the choices are correct.
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
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