I will give brainliest Protein synthesis can occur on the rough endoplasmic reticulum (ER) but not on the smooth ER. Which cell structures are attached to the surface of the rough ER that allow it to make proteins? Choose 1 (Choice A) A Ribosomes (Choice B) B Vacuoles (Choice C) C DNA strands (Choice D) D Chloroplasts

What makes the rough Endoplasmic reticulum rough are the ribosomes studded on it's surface. Answer is A ribosomes.

A. Ribosomes

Explanation:

Rough ER is called rough because it has ribosomes attached to its surface. The double membranes of smooth and rough ER form sacs called cisternae. Protein molecules are synthesized and collected in the cisternal space/lumen.

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation: