BIO 2870 LATEST MIDTERM EXAM-2023/2024 WITH VERIFIED QUESTIONS AND 100% CORRECT ANSWERS (answers on the last page). SPRING QTR. GUARANTEED GRADE A+ LATEST UPDATE 2024

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The smallest living unit within the human body is 1) A) a protein. B) an organ system. C) a tissue. D) the cell. E) an organ. 2) Which of the following terms is/are not used to define the structure that separates the contents of a human cell from its surrounding medium? A) cell wall B) phospholipid bilayer C) plasma membrane D) cell membrane E) both a cell wall and a phospholipid bilayer 2) 3) Functions of the plasma membrane include all of the following except 3) A) separation of the cytoplasm from the extracellular fluid. B) thermal insulation. C) sensitivity to chemical changes in the extracellular fluid. D) regulation of exchange of materials with the extracellular environment. E) structural support. 4) The plasma membrane is composed of 4) A) a bilayer of phospholipids. B) carbohydrates and lipids. C) a bilayer of proteins. D) carbohydrate molecules. E) carbohydrates and proteins. 5) Which of the following is not a function of membrane proteins? 5) A) bind to ligands B) regulate the passage of ions C) act as carrier molecules for various solutes D) storage of cellular nutrients E) act as anchors or stabilizers for the cell membrane 6) The tails of a phospholipid molecule are 6) A) hydrophobic. B) interlocked to provide membrane strength. C) hydrophilic. D) facing the cytosol. E) composed of amino acids. 7) The plasma membrane includes 7) A) phospholipids. B) integral proteins. C) glycolipids. D) cholesterol. E) All of the answers are correct. 8) What is the first part of the cell that is affected when the pH of extracellular fluid changes? 8) A) nucleus B) cytoskeleton C) the cytosol D) nucleolus E) plasma membrane 9) Identify the role of cholesterol in the plasma membrane. 9) A) forms enzymes B) affects membrane permeability C) enables ions to pass D) anchors the phospholipids E) All of the answers are correct. 10) Membrane proteins perform which of the following functions? 10) A) receptors B) recognition C) anchoring D) enzymes E) All of the answers are correct. ANSWERS 1) D 2) E 3) B 4) A 5) D 6) A 7) E 8) E 9) B 10) E