Of the following human trisomies, the one that generally has the most severe impact on the health of the individual is
A) trisomy 21.
B) Klinefelter syndrome (XXY).
C) trisomy X.
D) XYY.
E) All of the above have equal impact
Answer: A) trisomy 21.
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The normal RB gene product functions as
A) a transcription factor. B) a signaling pathway protein. C) an apoptosis pathway protein. D) a cell-surface receptor. E) a cell-cycle protein.
Which of the following is NOT a member of the segmented worms, phylum Annelida?
a. earthworms b. oligochaetes c. polychaetes d. roundworms e. leeches
In the analysis of quantitative traits, positions on chromosomes called quantitative trait loci (QTLs) are often discussed. In the same context, restriction fragment length polymorphisms (RFLPs) are also discussed. What is the relationship between QTLs
and RFLPs? What will be an ideal response?
Which of the following described roles attributed to accessory pigments such as carotenes and phycobiliproteins? (Check all that apply.)
A. The accessory pigments are involved in maintaining the Calvin cycle. B. These pigments extend the spectrum of wavelengths that will drive photosynthesis. C. These pigments absorb light in ranges not absorbed by chlorophylls and transfer the energy to chlorophylls. D. Accessory pigments protect organisms from potentially damaging intense sunlight.