Which of the following bacterial genera plays an important role in environmental nitrogen cycles?
A. Nitrobacter
B. Rhizobium
C. Azospirillum
D. both Nitrobacter and Rhizobium
E. Nitrobacter, Rhizobium, and Azospirillum
Answer: E
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Which of the following are considered to be fossils?
A) Footprints or other impressions preserved in stone B) Mineralized bones C) Animals frozen in ice or preserved in amber D) All of these
A mutation in the ruvB gene mostly likely will:
A. reduce resistance to UV light. B. increase binding of RuvA to DNA. C. increase binding of RuvB to DNA. D. stabilize the Holliday intermediate. E. increase recombination of DNA.
Select the best process listed below for each statement numbered
125–129. Note that you need to know that the sequence of amino acids directly reflects the sequence of genes that coded for their placement. a. an inversion b. a deletion c. a gene duplication d. a translocation e. an addition D 125. Homologous sets of genes ABCDEF and aBCdEF are located on nonhomologous chromosomes. Crossing over between them is suppressed because their locations are the result of this. D 126. Homologous sets of genes ABCDEF and AEDCBF are located on homologous chromosomes. Crossing over between them is suppressed because of this. D 127. A small region of a protein from three species is sequenced and found to be as follows:species X is alanine, glycine, glycine, threonine, alanine species Y is alanine, glycine, threonine, alanine species Z is alanine, valine, glycine, threonine, alanine The difference in the amino acid sequence of species Y is most likely due to this. Chapter 12 Chromosomes and Human Inheritance 127 D 128. A small region of a protein from three species is sequenced and found to be as follows:species X is alanine, valine, threonine, alanine species Y is alanine, glycine, threonine, alanine species Z is alanine, valine, glycine, threonine, alanine The difference in the amino acid sequence of species Z is most likely due to this. D 129. The nucleotide sequences of homologous regions of DNA of two species are AATGCCCCGTTA and AATGCCCCGCTTA. If this is not the result of a nucleotide base-pair addition, then it is most likely the result of this.
Communication among neurons and between neurons and other target cells occurs across short distances at a structure called the __________, a region where the signaling cell and the target cell are very close together.
a. catecholamine b. neurotransmitter c. synapse d. epinepherine