Bacterial cell walls are made of peptidoglycan (also called murein), which is made from polysaccharide chains cross-linked by unusual peptides containing D-amino acids. ... Gram-positive bacteria possess a thick cell wall containing many layers of peptidoglycan and teichoic acids.
invertebrates and Vertebrates
Answer: B. They allow for specific substance to travel throughout the cell.
Explanation: I know this because carrier proteins and channel proteins are some types of embedded proteins.
Answer:
B
Explanation:
Grassland biomes are in the Northern Hemisphere :)
