One of the most significant steps in the evolution of true cells from macromolecular assemblages was the evolutionof:a
electronegativity.
b. covalent bonding.
c. hydrogen bonding.
d. valence electrons.
e. molecular reproduction
e
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The Archaea generally lack which of the following that are normally found in gram-negative bacteria?
A. A complex peptidoglycan network B. Outer membrane C. Lipopolysaccharide D. All of the choices are correct.
The pH of pure water is ________ because ________.
a. 7.0; water dissociates an equal number of H+ ions and OH- ions b. 14.0; water dissociates and more OH- ions are formed because there are more hydrogen atoms in water c. 1.0; water dissociates and more H+ ions are formed since hydrogen is smaller and can separate from the oxygen easily d. 7.0; there are no ions formed in pure water e. acidic; there are more H+ ions than OH- ions present
In a life cycle such as that shown in part III of the figure above, if the zygote's chromosome number is 10, which of the following will be true?
A) The sporophyte's chromosome number per cell is 10 and the gametophyte's is 5. B) The sporophyte's chromosome number per cell is 5 and the gametophyte's is 10. C) The sporophyte and gametophyte each have 10 chromosomes per cell. D) The sporophyte and gametophyte each have 5 chromosomes per cell.
Subunits sometimes build up to form a macromolecule. Which molecule is least likely to be a subunit of a macromolecule?
A. amino acids B. glucose C. nucleotides D. steroids E. fatty acids