#Question id: 2262
#Unit 2. Cellular Organization
Ribosomes are made up of ____ subunits.
#Question id: 4306
#Unit 3. Fundamental Processes
Which of the following molecules helps to "turn off" genes in a cell?
#Question id: 4169
#Unit 3. Fundamental Processes
The first amino acid incorporated into proteins __.
#Question id: 673
#Unit 1. Molecules and their Interaction Relevant to Biology
How many complete turns are there in an ideal α-helix that contains 15 amino acids and has a pitch of 0.54 nm and a rise of 0.15 nm?
#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?