Which of the following characterizes the Domain Bacteria?
A) Prokaryotic cells; ether linkages in phospholipids
B) Eukaryotic cells; ester linkages in phospholipids
C) Prokaryotic cells; ester linkages in phospholipids
D) Complex cellular structures
E) Multicellular

C)

Explanation:

Bacteria are prokaryotic, which means they (generally) don't have organelles or a nuclear envelope around their nucleus.  They have ester linkages in the phospholipids in their cell membranes, while archea, which are also prokaryotic, have ether linkages.  Ether linkages are more chemically stable than ester linkages, and since archea live in extreme environments this is helpful.  

Bacteria are not multicellular and do not have organelles (complex cellular structures) besides ribosomes.

a neutral ph of 7 and normal organism temperature is needed for a certain enzyme to be effective.  

what would happen to the enzyme if the ph and/or temperature fluctuate greatly from the norm?  

a.the enzyme’s hydrogen bonds will break.  

b.the activation energy will increase.  

c.more product will be formed.

d.the ideal temperature and ph for the enzyme function will decrease.