Er, golgi body and other membrane bound organelles often work together to produce a finished functional product. what structure connects them?

The ER synthesizes most substances of the cell, and then the Golgi body ins the one to classify, distribute, and modify them.

The proteins forming the cytoskeleton are the ones that hold everything in place.

The main proteins doing this are the microtubules, microfilaments, and Intermediate filaments.

Also, mention the carrier proteins, that move substances inside the cell.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.