What kind of bond holds two water molecules to each other?
A) hydrogen bonds
B) ionic bonds
C) nonpolar covalent bonds
D) polar covalent bonds
A
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The rRNA gene sequences of hyperthermophilic Archaea and Bacteria have diverged ________ over time, likely due to ________
A) relatively little / strong constraints on sequence changes at higher temperatures B) substantially / higher mutation rates at higher temperatures C) relatively little / low mutation rates in these ancient organisms D) substantially / DNA damage at higher temperatures
General type of reaction for the formation new biological material
a. Anabolism b. Respiration c. Catabolism d. Fermentation
The building blocks of nucleic acids are
a. amino acids. b. nucleotides. c. pentose sugars. d. phosphate groups. e. nitrogenous bases.
After a region of DNA has been replicated, ________ removes the RNA primers
A) DNA polymerase I B) DNA polymerase III C) DNA helicase D) RNA primase E) DNA ligase