Answer:
1. The correct answer is cell-recognition protein.
These kinds of proteins are classified as a glycoprotein as they are the proteins with a molecule of carbohydrate associated with it. These proteins tag the cell and assist the immune system to determine them so the cells are identified and not destructed.
2. The correct statement is the nonpolar tails are repelled by water, so they position themselves in the middle of the bilayer. The polar heads are attracted to water, so they point outward.
Water refers to a polar molecule, thus, dissolves charged molecule with which it can produce hydrogen bonds. The uncharged or nonpolar molecule seems to be water-hating and thus produces clumps when putting in water and does not get dissolved. The amphipathic molecules like phospholipids seem to produce the lipid bilayer with the polar heads from the external and getting associated with water, and the non-polar carbon chains remain sandwiched in between, that is, away from the water.
3. As the cell increases, the surface-area-to-volume ratio increases is false, with the decrease of the cell size, the surface area to volume ratio increases will be the correct statement.
As the cell size decreases, the volume of the cell increases is false, the correct statement is that as the cell size decreases, the volume of the cell decreases.
As the cell size decreases, the surface-area-to-volume ratio decreases are false. The correct statement is that as the cell size decreases, the surface-area-to-volume ratio increases.
4. The correct answers have no nucleus and have no membrane-bound organelles.
In prokaryotes, the DNA is not enveloped by a nucleus membrane, and thus, there DNA is not separated from cytoplasm as in the case with eukaryotes. Also, they are devoid of membrane-bound organelles as they are primitive organisms.
