Question

ribosomes may be either free within the cytoplasm or bound to a membrane system known as the
○ cytoskeleton.
○ rough endoplasmic reticulum.
○ microtubule organizing center.
○ golgi apparatus.

question 16 1 pts
this membranous organelle is the site of protein synthesis for proteins that are secreted by the cell.
○ golgi apparatus
○ lysosome
○ rough endoplasmic reticulum
○ mitochondria
○ peroxisome

question 17 1 pts
a spherical membrane - bound structure that contains the genetic material of the cell and is often referred to as the \command center\ of the cell is the
○ nucleolus.
○ nucleus.
○ mitochondrion.
○ chromosome.

Explanation:

• For the first question, ribosomes can be free - floating in the cytoplasm or attached to the rough endoplasmic reticulum. The rough endoplasmic reticulum has ribosomes bound to its surface.
• For the second question, the rough endoplasmic reticulum is the site of protein synthesis for secreted proteins. It has ribosomes that synthesize proteins which are then transported out of the cell.
• For the third question, the nucleus is a spherical, membrane - bound structure that contains the cell's genetic material and is often called the "command center" of the cell.

Answer:

• Question 1: rough endoplasmic reticulum
• Question 16: rough endoplasmic reticulum
• Question 17: nucleus