The probable cause for the relapsing nature of relapsing fever caused by Borrelia recurrentis is

A. periodic spore dormancy and activation.
B. organisms that survive and propagate after spirochete-induced fever
C. the sequential appearance of new antibiotic resistant variants.
D. successive appearance of antigenic variants.
E. periodic hormonal fluctuations in the host.


Ans: D. successive appearance of antigenic variants.

Biology & Microbiology

You might also like to view...

When methanogens convert carbon dioxide to methane, it is a(n) ________ reaction.

A. aerobic B. oxidation C. ammonification D. reduction

Biology & Microbiology

Most known plant viruses are RNA viruses.

Answer the following statement true (T) or false (F)

Biology & Microbiology

The tissue located between the cortex and the vascular cylinder in a root is called the

a. endodermis. b. epidermis. c. meristem. d. parenchyma

Biology & Microbiology

Which of the following is an exception to the law of independent assortment?

a. monohybrid cross b. test cross c. gene linkage d. random mutation

Biology & Microbiology