Which part of the immune system's "learning system" is responsible for maintaining life-long immunity against measles after a measles infection?

a. somatic recombination c. affinity maturation
b. clonal expansion d. retention of responding cells


D

Biology & Microbiology

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Ascospores are produced in all of the following taxa EXCEPT

A) Aspergillus. B) Candida. C) Rhizopus. D) Saccharomyces.

Biology & Microbiology

________ synthesized urea in the laboratory from inorganic starting materials. Much of what is now called ________ dates from this discovery.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

As males and females age they produce lower volumes of sex hormones. For women, taking testosterone to increase

libido in becoming more common. Why is the same not common for males? What will be an ideal response?

Biology & Microbiology

Compare and contrast the sensory neurons, motor neurons, and interneurons

What will be an ideal response?

Biology & Microbiology