Comparing the sequence of ________ in the genomes of many organisms has allowed evolutionary biologists to create a comprehensive "tree" of life showing that every organism falls into one of three domains: Bacteria, Archaea, and Eukarya
Fill in the blank with correct word.
Answer: homologous nucleotides OR ribosomal RNAs
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True or false: The valence electrons of an atom are at the lowest energy level because their increased distance from the nucleus reduces their attraction to the atom's protons
A. true B. false
The four covalent bonds in methane (CH4) are arranged around carbon to give which one of the following geometries?
A) linear B) tetrahedral C) trigonal bipyramidal D) trigonal planar E) trigonal pyramidal
Answer the following questions true (T) or false (F)
1. AIDS is an autoimmune disease. 2. Therapy involving Toll-Like Receptors may be useful in treating some autoimmune disorders and cancers. 3. The blood consists entirely of blood cells and water.
Shigella species have the following characteristics except
A. not motile B. release endotoxin C. belong to Enterobacteriaceae D. infect the small intestine E. produce enterotoxin