The following bacterial species are all implicated in dental caries EXCEPT
A) Fusobacterium.
B) Borrelia.
C) Streptococcus.
D) Lactobacillus.
Answer: D
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Reabsorption of water in the hindgut of insects is controlled by which of the following?
A) osmotic gradients created by ion pumps B) selective absorptive processes that take place in the Malpighian tubules C) ion concentration of hemolymph D) osmoregulators in the rectal gland
All of the following types of culture media are enriched and selective except:
A) blood agar. B) colistin-nalidixic acid agar. C) phenylethyl alcohol agar D) Thayer-Martin agar.
Human skin color is thought to be determined by at least three pairs of alleles. If dark skin (D) is dominant to light skin (d), the genotypes that will produce the darkest skin are
A. D1d1 D2d2 D3d3. B. D1D1 D2d2 d3d3. C. d1d1 D2D2 D3d3. D. D1d1 D2d2 D3D3.
The genotype FF is known as __________________
A. Homozygous dominant B. Homozygous recessive (ff) C. Heterozygous (Ff)