In appositional growth of cartilage, Select one: a. chondroblasts within the tissue proliferate and add more matrix from the inside. b. new chondrocytes and new matrix are added on the outside of the tissue. c. osteoblasts replace the chondroblasts. d. the tissue becomes vascularized in order to grow. e. the cartilage is replaced with another kind of connective tissue.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

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while the heads of the phospholipid structure attract water, the tails are hydrophobic. the model shows how the hydrophilic section folds around the fluid molecules to bring them into the cell so they don’t need to pass through the hydrophobic tails.