Transmembrane movement of a substance with a concentration gradient utilizing a membrane protein is called ________.
Fill in the blank(s) with the appropriate word(s).
passive transport or facilitated transport
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All of the following statements about the cohesion-tension model are true EXCEPT
A. it is a model of how water and minerals are transported in xylem. B. it is dependent on the cohesive and adhesive properties of water. C. there is no expenditure of energy. D. tension created by transpiration in the leaves pulls water along the phloem from the roots hairs to the leaves.
________ are the blood cells that carry oxygen throughout the body.
A. Platelets B. Leukocytes C. Erythrocytes D. Thrombocytes
Gene therapy is a modern approach to preventing infectious disease
Indicate whether the statement is true or false
Mature human red blood cells
A. are biconcave discs without a nucleus. B. have a nucleus. C. fight pathogens. D. carry plasma. E. are rare in the bloodstream.