1. protein phosphorylation is an example of "covalent modification" of proteins. however, it is not understood what enzymes catalyze phosphorylation nor is the importance of phosphorylation well understood. 2. the peptide "backbone" consists of repetitive "units" of amino group nitrogen-alpha carbon-carbonyl carbon, moving from the n-terminus to the c-terminus.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.