One way to remove dirt and harmful substances from water is by filtering.
Answer:
B. Australia is isolated
Explanation:
They originated in South America and spread throughout the world, but due to competition on other continents, the other marsupials died out, while the ones on Australia lived.
Answer:
Abstract. DNA polymerase I (pol I) processes RNA primers during lagging-strand synthesis and fills small gaps during DNA repair reactions. However, it is unclear how pol I and pol III work together during replication and repair or how extensive pol I processing of Okazaki fragments is in vivo
Explanation:
Answer: A fluid phospholipid bilayer with embedded proteins.
Explanation: Biological membranes are composed of phospholipids that interact with each other to form a bilayer in which proteins are embedded. Phospholipids have the fatty acyl chains (hydrophobic tails) which face each other to form the interior of the bilayer, while their polar head groups face the outward environment interacting with water molecules. The fluid mosaic model for structure of biological membranes is due to the interactions between the hydrophobic tails of the lipids. The fatty acyl chains of the phospholipids (nonpolar/ hydrophobic tails) in the interior of the membrane form a fluid hydrophobic region while the integral proteins float in the sea of these lipids. The proteins and lipids move freely and laterally in the plane of the bilayer, but movement there is restriction in the movement from one face of the bilayer to the other. The proteins are embedded at regular intervals and are held by hydrophobic interactions between the membrane lipids and the hydrophobic regions of the proteins.
The membrane mosaic is fluid because most of the interactions among its components are noncovalent, thereby leaving the lipid and protein molecules free to move laterally in the plane of the membrane.
Mitosis, resulting in two identical diploid cells. Sex cells, on the other hand, are made by meiosis, resulting in four different haploid cells.
