BIOL 351 Lecture Exam 1 Questions with Complete Solutions Which are the three currently accepted domains? - Correct Answers ✅Archaea, Bacteria, and Eukarya The current widely accepted estimates for the origin of life on earth and formation of earth are (in years: life and earth): - Correct Answers ✅3.6 ×10^9 and 4.6 ×10^9 Which of the following are arranged from smallest to largest?
- Correct Answers ✅nano, micro, milli, kilo
The FIRST self-replicating systems likely contained which molecule(s) as a central component? - Correct Answers
✅RNA
Bacteria are generally identified to species by using which of the following? - Correct Answers ✅a combination of genetic, biochemical, and microscopic approaches The categorization of cells into "three domains" of life was originally based on what evidence? - Correct Answers ✅Small subunit ribosomal rRNA comparison Which is the best description of the primary purpose of a phylogeny? - Correct Answers ✅Phylogenies show evolutionary relatedness between organisms. 1 / 2
BIOL 351 Lecture Exam 1 Questions with Complete Solutions Which of the following taxonomic ordering is correct (either top to bottom or bottom to top)? - Correct Answers ✅domain, phylum, class, order, family, genus, species Based on the phylogenetic tree shown below, which of the following statements about evolutionary distance (E.D.) is correct? - Correct Answers ✅Organism K is equally related to Organisms L and M Once several different but related sequences are obtained, which step must be performed BEFORE a phylogenetic tree is constructed? - Correct Answers ✅sequence alignment Which term refers to proteins that extend across the plasma membrane from one side to the other? - Correct Answers ✅transmembrane proteins In which types of organisms are phospholipids with branched chains common? - Correct Answers ✅archaea The lipopolysaccharide molecule is an important component of the cell membranes of which organisms? - Correct Answers ✅gram-negative bacteria Bacteria use flagela to move purposefuly toward or away from a chemical by which of the following? - Correct
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