The virulence of this organism, which causes chancroid, is most likely attributed to:
a. proteases.
b. capsular factors.
c. hemolysins.
d. catalase.
B
The organism that causes chancroid is H. ducreyi. Although the virulence is uncertain, capsular factors, pili, and certain toxins are probably involved in the attachment and penetration of host epithelial cells.
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If a scientist found very high concentrations of organic biomarkers deep inside a 3.9 billion year old meteorite, how would this effect the explanation of the origins of life on Earth?
A. This would prove the extra-terrestrial origin of life. B. This would provide evidence for the extra-terrestrial origin of life. C. This would disprove the terrestrial origin of life. D. This would provide evidence for the uniqueness of life on earth. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the role of meteorites in the origin of life? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-COOH is a(n)
A. fatty acid. B. amino acid. C. glycerol. D. steroid.
Charles Darwin believed that artificial selection was
A) a process completely identical to natural selection. B) impossible. C) unimportant. D) similar in many ways to natural selection. E) a common phenomenon in nature.
Which of the following is NOT a component of bacterial flagella?
A) flagellin B) basal body C) tubulin D) filament E) hook