Consider an experiment where a small amount of blue-coloured copper sulphate (Cu
ID: 220967 • Letter: C
Question
Consider an experiment where a small amount of blue-coloured copper sulphate (CuSO_4) salt s added to a mixture of water and paraffin oil and the solution is shaken so that the molecules making up the salt become hydrated by some of the other molecules in this solution. Complete the sentence with ONE of the following options: The Cuso_4 becomes hydrated by: Select one: polar water molecules giving rise to Cu^2+ cations and SO_4^-2 anions non-polar water molecules giving rise to Cu^2+ cations and SO_4^2- anions polar oil molecules giving rise to Cu^2+ anions and SO_4^2- cations non-polar oil molecules giving rise to Cu^2+ anions and SO_4^2- cations polar water molecules giving rise to Cu^2+ anions and SO_4^2- cations Which ONE of the following statements about ion channels is INCORRECT? Select one lon channels can be opened either directly or indirectly by neurotransmitters Ion channels allow transport of an ion against its electrochemical gradient. Ion channels allow transport of an ion against its chemical gradient, if the electrical driving force is sufficient. lon channels may be opened by stretch of the cell membrane lon channels have gates that may be opened by intracellular ligands. The cell membrane is composed of a lipid bilayer with membrane proteins embedded within In regards to the cell membrane, which ONE of the following statements is CORRECT? Select one Various membrane proteins dip into the lipid (or "anchor) from either the intracellular or extracellular surface but typically do not transverse or span across the membrane as this would make the bilayer collapse. The lipids that make up the membrane typically have a non-polar (hydrophobic) external surface and a polar (hydrophilic) interior. The membrane proteins and lipid molecules are fixed in a constant position, representing a mosaic pattern interspersed with cholesterol. The lipid molecules require constant energy in the form of ATP to keep their hydrophobic regions closely adjacent in the bilayer arrangement. The lipids within the cell membrane include phospholipids and sphingolipidsExplanation / Answer
Answer:
1. (a) The CuSO4 becomes hydrated by polar water molecules giving rise to Cu2+ cations and SO42- anions.
2. (b) Ion channels allow transport of an ion against its electrochemical gradient.
3. (e) The lipids within the cell membrane included phospholipids and sphingolipids.
4. (b) Opening of more K+ channels will hyperpolarize the membrane.
5. (b) Activation of nicotinic acetylcholine receptors, generation of an end-plate potential, enzymatic breakdown of the neurotransmitter.