Why are most infants with phenylketonuria usually healthy at birth?
a. The defect causing the condition has usually been repaired by that time.
b. The mother breaks down phenylalanine for both herself and her fetus.
c. The infant can produce sufficient quantities of the enzymes needed by birth.
d. Phenylalanine can be completely excreted in infants.
e. Phenylalanine is completely metabolized in infants
b
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If a plant species exhibits maternal inheritance for leaf pigmentation, what is the phenotype of the parents of a variegated (green and white leaves) plant?
A. The maternal plant must be white and the paternal plant must be green. B. The maternal plant must be green and the paternal plant must be white. C. The maternal plant must be variegated and the paternal plant can be any color. D. Both the maternal and paternal plant must be variegated. E. The maternal plant must be variegated and the paternal plant must be white.
The antibodies that activate the complement system are
a. IgA and IgD. b. IgG and IgM. c. IgG and IgD. d. IgE and IgM. e. IgA and IgE.
Functions of the mantle in clams include
a. secreting the shell. b. forming pearls around irritating grains of sand. c. forming the incurrent and excurrent siphons. d. all of the above.
An accurate and comprehensive description of pseudogenes must include the statement that (Select all that apply)
A. pseudogenes encode proteins, but the translated proteins are non-functional. B. pseudogenes may have some gene-like features such as a promoter and splice sites. C. all pseudogene pretend to transcribe other genes when they only transcribe one type of genetic information. D. pseudogenes can provide insight into the evolutionary history of the related functional gene. E. every pseudogene has a similar DNA sequence to some functional gene.