Spirochetes have a twisting and flexing locomotion due to appendages called

A. periplasmic flagella (axial filaments).
B. sex pili.
C. cilia.
D. flagella.
E. fimbriae.


Answer: A

Biology & Microbiology

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a. induction b. somite c. homeotic d. morphogen

Biology & Microbiology

Based on the literature, you hypothesize that students in traditional biology lectures will have the same grades as students in online biology lectures. You decide to test your hypothesis by comparing grades of students in traditional and online biology lectures over a semester. As a result of the experiment, you observe that the grades in the traditional lectures and the grades in the online lectures are not significantly different. What do these observations allow you to do?

A. accept the hypothesis without further question B. reject the null hypotheses C. develop a scientific theory D. reject the hypothesis

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Which of the following is the most likely trigger for reactivation of tuberculosis?

A. Ultraviolet B light B. Kidney transplant C. Poor hygiene D. Estrogen therapy

Biology & Microbiology

In positive control regulation, the activator protein binds to the ________ site to induce transcription

a. activator-binding b. operator c. promoter d. repressor

Biology & Microbiology