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True or false 5. carrier proteins have the ability to to change shape and physicially move molecules across the cell membrane. 6. in a facilitated diffusion, the concentration of the molecules to be moved across the cell membrane is higher inside the the cell.

Which of the following statements is a scientific claim? a. the early solar system had large amounts of water; so, the oldest objects in the solar system should also be abundant in water. b. earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea. c. the mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency. d. planet earth is abundant in water, but there is no way to scientifically determine from where earth's water originated.

How would you best describe the role of gene expression in cells a- cells destroy the dna of genes that they do not use b- when cells divide in mitosis, they pass on only the genes that are required. c- to become specialized, cells need to control the production of proteins coded for in their dna d- all genetic information in a cells dna is fully expressed at all times.