Osmosis is important because it stabilises our internal environment <span>by keeping the water and intercellular fluids levels balanced, and because of osmosis nutrients make their way to the cells which is important to the survival of cells</span>
The plasma membrane is composed of the phospholipid bilayer. The phosphilipids have one head and two tails. The head is polar (hydrophilic) as the tail is non-polar (hydrophobic).
Answer:
Population
Explanation:
Population is a group of individuals that live in the same geographical area which have the ability to interbreed because they belong to the same species. So organisms of the same species when live in a particular area are considered in population but members of the same species that are geographically isolated and can not interbreed do not make a population.
Many population comes together to form community and many communities together forms an ecosystem. An ecosystem is a functional unit which is made up of many communities with interacts with its physical environment. So the correct answer is population.
Answer:.
→The α‑helix is held together by hydrogen bonds between the amide N − H N−H and C = O C=O groups
→ In a β‑pleated sheet, the side chains are located between adjacent segments.
→ In an α‑helix, the side chains are located on the outside of the helix. .
→ The secondary level of protein structure refers to the spatial arrangements of short segments of the protein
Explanation:
This is the level of protein which results from spatial arrangement produced by the formation of hydrogen bonds between the oxygen atom of one carboxyl group(c=0) group, and hydrogen of the NH group of amino acids four places ahead of it .( The resulting structure is coiled and are therefore called alpha-helices)
<u>AND</u>
Hydrogen bonds between adjacent amino acids that join them side by side so that the bonds appear straight rather than coil, and the chains form upwards-downwards-upward- downwards format to form flat shaped structure called beta-pleated sheet.
The hydrogen bonding is due to strong polarities of the –NH- CO- groups of amino acids.
The two structures account for the spatial arrangement of secondary protein structure. Secondary structure is stabilized by the orientation and aggregation of these hydrogen bonds. . The outwards distributions of the side chains, the non-polar nature (hydrophobic) of alpha-helix makes some secondary proteins ideal as integral membrane proteins.
Note-<u> peptide bond stabilizes primary protein structure.</u>
