Answer:
The correct answer is: C. Active Transport.
Explanation:
Because Na+ and K+ are ions, which makes them <em>charged molecules</em>, they can only diffuse through the cell membrane when using specialized protein channels. This is called <u>facilitated diffusion</u> and is a form of passive transport because sodium and potassium move <em>following their gradients</em>, which are made of the difference in concentration between the inside of the cell and the outside of the cell. For example, potassium is highly concentrated inside the cell and poorly concentrated outside the cell, so potassium diffuses from the inside to the outside to even the concentrations.
But the question asks in which process Na+ and K+ move in and out of the cell SIMULTANEOUSLY, so the answer is actually <u>active transport</u>. Active transport is the opposite of passive transport. While passive transport occurs naturally and doesn't need ATP (energy) to happen, active transport needs ATP because it moves molecules AGAINST their gradient. One of the most famous and important structures involved in active transport is the Na+/K+ pump, which consists of a <em>specialized protein using energy to enter 2 potassium ions and take out 3 sodium ions at the same time</em>. This Na+/K+ is fundamental to maintain the gradients, which are important for the correct functioning of many cells.
Answer:
The correct answer is C) selective transport through nuclear pore complexes
Explanation:
Nucleus is the place where the replication and the transcription of DNA occurs. The process of translation in eukaryotes occurs in cytoplasm therefore RNA has to come out of the nucleus.
Nuclear pore complexes are the openings in the nuclear membrane from where these molecules come out in the cytoplasm. Small RNA like tRNA directly comes out through binding directly to export receptors but large RNA like mRNA forms ribonucleoprotein particles which involves class-specific adaptor proteins for transport. So the right answer is C.
Both cells share one similar structure which is Ribosomes.
A heart attack happens when a coronary artery becomes out of no where in a instant blocked and it stops the flow of blood to the heart muscle and starts to damage it.
