How many differentiated cell types exist in an adult?
a. 50
b. 100
c. 150
d. 200
e. it varies from person to person
D
Biology & Microbiology
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The clonal selection theory implies that
A. related people have similar immune responses. B. antigens activate specific lymphocytes. C. only certain cells can produce interferon. D. memory cells are present at birth. E. the body selects which antigens it will respond to.
Biology & Microbiology
Protection Mechanism I: temporal
What will be an ideal response?
Biology & Microbiology
"Jumping genes" that have the ability to move within and between chromosomes are called
A. oncogenes. B. transposons. C. introns. D. retroviruses. E. exons.
Biology & Microbiology
The Ames test demonstrates that a chemical is
A) carcinogenic. B) carcinogenic in Salmonella. C) mutagenic in Salmonella. D) carcinogenic in humans. E) mutagenic in humans.
Biology & Microbiology