The plasma membrane is composed of a phospholipid bilayer with embedded proteins. What is one of the functions of the embedded proteins? A.
B.
C.
D.
protecting the cell from physical harm
defining the cell's structure and shape
preventing the phospholipid tails from binding together
allovwing specific substances to flow into the cell

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b. diffusion c. endocytosis d. exocytosisc. endocytosis