Answer:
They are opened either by the binding of ligands or by changes in electric potential across the membrane
Explanation:
Ion channels are the integral membrane proteins that form pores or holes for the transport of specific ions, such as potassium ions (K+), Na+, etc. Most ion channels are selective and allow only a single type of ion to pass through. These ion channels facilitate the diffusion of ions down the concentration gradient and do not require ATP.
Ion channels are mostly gated. Some ion channels open in response to change in the concentration of ions and electric charges across the membrane. Some ion channels open and close in response to the binding of specific molecules called a ligand. For example, binding of two molecules of acetylcholine to the receptor on the motor endplate of a neuromuscular junction opens an ion channel in the ACh receptor through which Na+ can flow across the membrane.
Answer:
question 4: lipids provide the energy for metabolic processes. serve as reserve energy of the body. so id say<u> </u><em><u>youre answer is d just because it says the "reserve".</u></em>
question 5:
Nucleic acids / nucleotide's.
carbohydrates / monosaccharide's.
Proteins / amino acids.
Lipids / glycerol and fatty acids.
question 6: i dont know this one sorry
question 7:
1. nucleic acid
2. lipid
3. protein
4. carbohydrate
question 8: i dont know sorry
hope this helped even though i didnt do much T^T
have a good day
Answer: elevation, landforms
, relief
Explanation:
Area's topography can be defined as the physical features with which the area of the land is associated with. These features are mountains, lakes, valleys and rivers.
The following are the elements of the parts of the area's topography:
Elevation: The elevation describes the height above the given level. This can be used to measure the height of the mountain.
Landforms: Landforms are the features of the Earth's surface that includes the parts like hills, plains and mountains.
Relief: A relief gives an idea of elevation from the concerned point in a landform.