The smallest subatomic particle is the ________.
A. proton
B. electron
C. neutron
D. ion
E. isotope
Answer: B
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During the initiation of nitrogen-fixation nodules, the Rhizobium bacteria release what type of molecules to signal the host plant?
A. sugars B. proteins C. transcription factors D. flavonoids E. Nod factors
Trace elements dissolved in seawater are present in concentrations less than one part per thousand
Indicate whether the statement is true or false
Which of the following is true of a population?
a. Members of a population are all genetically identical. b. Members of a population live together and interbreed. c. A population may include both predators and prey. d. Members of a population spend much of their time living apart. e. More than one of these is true
DNA methylation may be a significant mode of genetic regulation in eukaryotes. Methylation refers to ________
A) changes in DNA-DNA hydrogen binding B) altering translational activity, especially of highly methylated tRNAs C) altering RNA polymerase activity by methylation D) alteration of DNA polymerase activity by addition of methyl groups to glycine residues E) addition of methyl groups to the cytosine of CG doublets