Question

the outer boundary of a human cell is called the
cytoplasm.
plasma membrane.
nucleus.
cell perimeter.
question 13
1 pts
in the matrix of the plasma membrane, a variety of proteins are embedded. some of these proteins serve as passageway for na+ ions or glucose. these proteins are called
receptor proteins.
transport proteins.
signal proteins.
amino acids.
question 14
1 pts
which of the following is a type of cell extension that lines the intestines and other areas of the body?
cilia
flagella
microvilli
microfilaments

Explanation:

• The outer - boundary of a human cell is the plasma membrane which separates the cell's interior from the outside environment.
• Proteins in the plasma membrane that act as passageways for substances like Na+ ions or glucose are transport proteins.
• Microvilli are cell extensions that line the intestines and other areas of the body to increase surface - area for absorption.

Answer:

Question 12: plasma membrane.
Question 13: transport proteins.
Question 14: microvilli.