Question

imagine a cell needs to move a lot of chlorine ions (cl) across its plasma membrane. which information would tell you whether this movement will be active or passive transport? select all that apply.
whether the ions are moving from high to low concentration
whether an integral membrane protein is needed
whether energy input is needed
whether there is cholesterol in the membrane
whether the ion is hydrophilic

Explanation:

• For "whether the ions are moving from high to low concentration": Passive transport moves substances down their concentration gradient (high to low). Active transport moves against (low to high). So this info helps.
• For "whether an integral membrane protein is needed": Both passive (facilitated diffusion) and active transport can use integral membrane proteins. So this alone doesn't distinguish.
• For "whether energy input is needed": Active transport requires energy (e.g., ATP). Passive transport doesn't. So this info helps.
• For "whether there is cholesterol in the membrane": Cholesterol affects membrane fluidity, not transport type (active/passive).
• For "whether the ion is hydrophilic": Chloride ions are hydrophilic, but this just tells about solubility, not transport type (active/passive).

Answer:

• whether the ions are moving from high to low concentration
• whether energy input is needed