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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology