During a specific defense, the process of increasing the numbers of the selected cells is called:a
mitotic expansion.
b. clonal selection.
c. divisional activation.
d. lymphocytic activation.
e. memory establishment.
b
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As oceans began to form on Earth billions of years ago, they were small, warm, and not very salty
Indicate whether the statement is true or false
Which one of the following causes the most severe illness in humans, with a mortality rate of 30 percent?
A) western equine encephalitis
B) eastern equine encephalitis
C) St. Louis encephalitis
D) California encephalitis
E) West Nile encephalitis
The maturation promoting factor stimulates meiotic maturation in oocytes and in doing so inhibits mitosis in somatic cells.
a. true b. false
Which statement regarding DNA packing is false?
A) A nucleosome consists of DNA wound around a protein core of eight histone molecules. B) DNA packing tends to promote gene expression. C) Highly compacted chromatin is generally not expressed at all. D) Prokaryotes have proteins analogous to histones.