Which of the following statements are true of the cell wall?

i. composed of proteins and lipids
ii. composed of proteins and cellulose
iii. located in animal cells
iv. located in plant cells
v. semipermeable
vi. not permeable at all

a. ii, iii, iv, and vi only
b. ii, iv, and v only
c. i, iv, and vi only
d. i, iii, iv, and v only

The answer is B because:

Cell walls are made of cellulose and proteins (hence II).

Animal cells don't have cell walls (only cell membrane) but plant cells do so IV

They must be semipermeable since materials for example carbon dioxide and water for photosynthesis have to go into the cell some way.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.