Ammonia is the most toxic of the three major forms of nitrogenous waste
A. true
B. false
A
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Which embryonic tissue is incorrectly associated with its derivative?
a. skin; ectoderm b. nervous system; ectoderm c. liver; endoderm d. circulatory system; mesoderm e. brain; mesoderm
Modification enzymes typically methylate specific bases within the recognition sequence to prevent digestion of the nucleotide sequence by restriction endonucleases
Indicate whether the statement is true or false.
For the genetic cross Aa × Aa, 3:1 is the:
a. phenotypic ratio for the offspring if inheritance was by complete dominance. b. phenotypic ratio for the offspring if inheritance was by incomplete dominance. c. genotypic ratio for the offspring if inheritance was by incomplete dominance. d. genotypic ratio for the offspring if inheritance was by complete dominance. e. None of the above are correct.
Rickets is caused by
a. overexposure to UV radiation. b. an excess of calcitonin. c. inadequate amounts of vitamin D. d. an excess of ascorbic acid. e. a fetal deficiency of thyroid hormone.