In which of the following structures does fertilization typically take place?
A. fallopian tubes
B. ovaries
C. uterus
D. cervix
E. vagina
A
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In a partially diploid F? exconjugant, there are two alleles for lac (1 and 2 ) and two alleles for his (3 and 4). The phenotype of this cell is identical to a lac 1 his 4 cell. What is the best interpretation?
A) Lac 1 and 2 and his 3 and 4 share only lac 1 and his 4 phenotypes. B) Lac 1 complements lac 2 and his 3 complements his 4. C) Lac 1 and his 4 are dominant. D) Lac 1 and his 4 are wild types. E) Lac 1 shows its phenotype only if his 4 is also present.
Which of the following components is/are found in the cell walls of gram-positive bacteria but NOT gram-negative bacteria?
A. Cytoplasmic membrane B. Lipopolysaccharide C. Outer membrane D. Peptidoglycan E. Teichoic acid
What was the species concept used by Linnaeus?
A) biological B) morphological C) paleontological D) ecological E) phylogenetic
Preservation of food to limit microbial survival and growth includes
A. refrigeration and freezing. B. high temperature. C. irradiation. D. pasteurization. E. All of the choices are correct.