Examlex
Which of the following cannot pass through a plasma membrane by primary active transport?
Water Jets
High-pressure water pumps used for cutting a variety of materials, including metals and stones, through a precise and controlled erosion process.
Caulk
A waterproof filling and sealing material used in building works and repairs to prevent water penetration in gaps or joints.
Pet Flea Collars
Devices worn around the necks of pets, such as dogs and cats, designed to repel or kill fleas.
Think It Over
A common response from potential customers indicating a need for more time to consider a purchase or decision.
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