Question

learning: chapter 03: sections 5-7
question
match the type of membrane transport with the appropriate characteristic: primary active transport.
answer
random motion of a substance resulting in movement from an area of high to lower concentration
a passive process utilizing a protein carrier or channel
movement of a substance that utilizes a carrier; energy comes directly from hydrolysis of atp
movement of a substance that utilizes a carrier, and has a concentration gradient as the source of energy
i dont know yet

Explanation:

To solve this, we recall the characteristics of primary active transport: it uses a carrier (like a pump) and directly uses energy from ATP hydrolysis (since "primary" means the energy source is ATP itself, not from a gradient). Let's analyze each option:

• First option: Describes simple diffusion (random motion, high to low, no carrier, passive) – not primary active transport.
• Second option: Describes facilitated diffusion (passive, uses carrier/channel) – primary active transport is active (needs energy), so no.
• Third option: "Movement of a substance that utilizes a carrier; energy comes directly from hydrolysis of ATP" – this matches primary active transport (e.g., sodium - potassium pump uses ATP directly and a carrier).
• Fourth option: Describes secondary active transport (uses a carrier and energy from a concentration gradient, not ATP directly).
• Fifth option: Not a valid answer for the match.

Answer:

The correct option is the one with the description: "Movement of a substance that utilizes a carrier; energy comes directly from hydrolysis of ATP" (the third option in the list of answer choices).