A gene mutation is defined as change in the
A) structure of ribosomes. B) activation of a gene.
C) nucleotide sequence of DNA. D) nucleotide sequence of RNA.
C
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Which of the following chemical properties or interactions of purines and pyrimidines does not affect the structure and function of nucleic acids?
A. planar nature of bases due to resonance B. tautomerism of the bases C. absorbance of UV light D. hydrophobic stacking E. base pairing
________ proteins stabilize the arrangement of the chlorophyll within a photosystem and modify the absorption spectra of specific chlorophyll molecules.
Fill in the blank(s) with the appropriate word(s).
Select the potential problems with using current dispersal barriers (for example, a mountain range) to delineate biogeographical regions. Check all that apply.
_____ A barrier for one group of organisms may not be a barrier for another group of organisms. _____ The world's biota correspond more closely to political boundaries. _____ Global climate change may change the distribution of taxa and the size and/or location of some of the dispersal barriers. _____ Human conflicts lead to ever-changing political boundaries. _____ Distantly related organisms with similar appearance and habits may exist on either side of a dispersal barrier.
Julie has pigmented spots and tumors on her skin and nervous system. It is determined the disease
Julie has is autosomal dominant. Julie most likely has _____________. A. hemophilia D. Marfan syndrome B. neurofibromatosis E. fragile-X syndrome C. achondroplasia