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choose cell membranes from the drop down list of organelles. select \sh…

Question

choose cell membranes from the drop down list of organelles. select \show close-up\ in the bottom left corner. read the description and watch the animation. which kinds of molecules does the cell membrane allow to move directly in and out of the cell? choose two correct answers. charged ions uncharged ions large molecules small molecules any molecule needed by the cell

Explanation:

Brief Explanations

The question is about cell membranes and which molecules they allow to move directly in and out of the cell. From biological knowledge, cell membranes are selectively permeable. Small, uncharged molecules (like oxygen, carbon dioxide, water) can pass through the lipid bilayer directly (simple diffusion). Charged ions and large molecules (like glucose, proteins) generally need protein channels or carriers (facilitated diffusion or active transport) and can't pass directly. Also, "any molecule needed by the cell" is incorrect as the membrane is selective. So the correct ones should be small molecules and uncharged ions (and maybe we need to pick two, but based on the options, small molecules and uncharged ions (or maybe small molecules and any molecule? No, the membrane is selective). Wait, the options are: charged ions, uncharged ions, large molecules, small molecules, any molecule needed by the cell.

Cell membrane's lipid bilayer allows small, non - polar (uncharged) molecules to pass directly. So small molecules (like water, which is small and polar but still can pass to some extent, and other small uncharged like O₂, CO₂) and uncharged ions? Wait, ions are charged. Wait, maybe the question is about simple diffusion. So small molecules (e.g., O₂, CO₂, H₂O) and uncharged (since charged ions can't pass directly). Wait, maybe the correct two are small molecules and uncharged ions? Or small molecules and any molecule? No, the cell membrane doesn't allow any molecule needed, it's selective. So the correct options for molecules that can move directly (simple diffusion) are small molecules and uncharged (wait, ions are charged. Maybe the options have a typo, but based on standard biology, small, uncharged, non - polar molecules can pass directly. So among the options, small molecules and uncharged ions (if uncharged ions is a misnomer, maybe uncharged molecules). But given the options, the two correct ones should be small molecules and uncharged ions (or small molecules and any molecule? No). Wait, the question says "Choose two correct answers". Let's re - evaluate:

  1. Charged ions: Can't pass directly (need channels).
  2. Uncharged ions: Wait, ions are charged. Maybe a mistake, maybe uncharged molecules. But assuming the option is uncharged (molecules, maybe a typo for uncharged molecules), then uncharged (molecules) can pass.
  3. Large molecules: Can't pass directly (need endocytosis/exocytosis or carriers, but not directly through the bilayer).
  4. Small molecules: Can pass directly (e.g., O₂, CO₂, H₂O).
  5. Any molecule needed by the cell: No, the membrane is selective, so it doesn't allow any, only specific ones.

So the two correct ones should be small molecules and uncharged ions (assuming uncharged ions is a misprint for uncharged molecules) or small molecules and maybe uncharged ions. Alternatively, maybe the correct answers are small molecules and any molecule? No, that's wrong. So based on standard cell membrane permeability, small molecules (and uncharged, non - polar) can pass directly. So the two correct options are small molecules and uncharged ions (or maybe small molecules and the "any molecule" is wrong). Wait, maybe the question is from a basic biology context where small molecules and uncharged (ions? No, ions are charged) – maybe the options are misworded. But given the options, the two correct answers are small molecules and uncharged ions (or small molecules and the "any molecule" is incorrect). Wait, perhaps the intended answers are small molecules and uncharged ions (even though ions are charged, maybe the question c…

Answer:

small molecules, uncharged ions (assuming the options are to be selected as the two correct ones; if the options are in boxes, then the boxes for small molecules and uncharged ions should be checked)