The model shows two types of proteins, channels and carriers, allowing the movement of molecules into the cell. as indicated by the model, what question is best asked about the role of the proteins in this type of transport? a) how can proteins be used in active transport? b) how do proteins allow for endocytosis of large molecules? c) how can molecules move against the gradient through proteins? d) how do proteins allow for facilitated diffusion of molecules into the cell?

D

Explanation: Since proteins are being used but energy is not, this process is called facilitated diffusion. Protein channels and carriers are both types of facilitated diffusion.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.