The antibodies found in mucus, saliva, and tears are
A) IgG.
B) IgM.
C) IgA.
D) IgD.
E) IgE.
C
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Phenylketonuria (PKU) is a recessive human disorder in which an individual cannot appropriately metabolize the amino acid phenylalanine. This amino acid is not naturally produced by humans
Therefore, the most efficient and effective treatment is which of the following? A) Feed them the substrate that can be metabolized into this amino acid. B) Transfuse the patients with blood from unaffected donors. C) Regulate the diet of the affected persons to severely limit the uptake of the amino acid. D) Feed the patients the missing enzymes in a regular cycle, such as twice per week. E) Feed the patients an excess of the missing product.
Height (tallness) in humans is a polygenic trait. Assume the following: There are 4 genes that determine height (Aa, Bb, Cc, Dd). Each dominant allele adds 2 inches of height to an individual. The height of the recessive individual (aa, bb, cc, dd) is 5 feet. What is the height of a person with the genotype (AA, Bb, cc, DD)?
A. 5 feet, 4 inches B. 5 feet, 10 inches C. 5 feet, 8 inches D. 6 feet, 6 inches E. 5 feet, 6 inches
If a cell from the blastoderm of the Drosophila embryo is committed to form part of an abdominal segment of the adult, such as the sixth one, and this cell is transplanted into the thorax-committed region of another embryo, will it develop properties
of a thoracic or an abdominal segment?
Extracts of pathogenic bacteria can transform harmless bacteria to harmful bacteria unless ____ enzymes are added to the extract.
A. protein transfer B. mRNA-degrading C. tRNA-degrading D. DNA-degrading E. nucleic transfer