#Question id: 4932
#Unit 11. Evolution and Behavior
Which of the following is the best hypothesis regarding origins of nucleic acids?
#Question id: 1562
#Unit 4. Cell Communication and Cell Signaling
________ are cells of the mammalian innate immune response that help destroy tumors.
#Question id: 3644
#Unit 3. Fundamental Processes
In replication: soon after synthesis, the DNA fragments are joined to make one continuous piece of DNA by the enzyme:
#Question id: 685
#Unit 1. Molecules and their Interaction Relevant to Biology
A protein has a molecular weight of 5600 daltons; its subunits are about 1960 daltons. There are ________ protein chains per oligomer.
#Question id: 59
#Unit 1. Molecules and their Interaction Relevant to Biology
Nitrogen (N) normally forms three covalent bonds with a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). What do you predict to be the charge on ammonium?