The lining of the digestive tube is formed from:a
endoderm.
b. ectoderm.
c. germ cells.
d. mesoderm.
e. pseudoderm.
a
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TH cells express a ________ protein coreceptor
A) CD4 B) CD8 C) CD12 D) T cell receptin
Proper design of a urogenital swab expressly intended for the collection of urethral discharge should include what feature?
a. Charcoal-treated cotton or rayon b. Antibiotic-treated calcium alginate c. Non flexible Shaft of wood and not flexi-ble d. Dacron-tipped swabs
Lichens are mutualisms between
A. fungi and a green plant. B. yeast and another fungi. C. fungi and a mycorrhizae. D. mycorrhizae and yeast. E. fungi and an alga.
Assume a biallelic locus in a diploid population has the following genotype frequencies: A1A1 = 0.59; A1A2 = 0.16; and A2A2 = 0.25. What is the observed allele frequency (p) of the A1 allele?
a. 0.59 b. 0.16 c. 0.25 d. 0.67 e. 0.33