HCS 212 TEST BANK 2 EXAM PRACTICE QUESTIONS AND ANSWERS

HCS 212 TEST BANK 2 EXAM PRACTICE QUESTIONS AND ANSWERS The study of the structure and function of cells is A) biochemistry. B) gross anatomy. C) cytology. D) electron microscopy. E) phrenology. - Ans:-c Which of the following shows the fine structure of a plasmalemma (cell membrane) and the details of intracellular structures? A) light microscopy B) transmission electron microscopy ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 2/26 C) scanning electron microscopy D) ultrasound E) magnetic resonance imaging - Ans:-b Cells float in a watery medium called A) cytoplasm. B) extracellular fluid. C) cytosol. D) cellular fluid. E) None of the answers are correct. - Ans:-b Which of the following describes phospholipids in the plasmalemma? A) The lipid tails are hydrophobic. B) The lipid tails are hydrophilic. C) The phosphate heads are hydrophobic. D) The tails are at the surface. E) The heads are on the inside. - Ans:-a ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 3/26 The viscous, superficial coating on the outer surface of the plasmalemma is called the A) glycocalyx. B) pseudopodia. C) inclusions. D) tubulin. E) cytosol. - Ans:-a How do peripheral proteins contribute to the structure of the plasmalemma? A) They form a structural element by being embedded in the plasmalemma. B) Some form channels to permit passage of water molecules, ions, and small water-soluble compounds into and out of the cell. C) Some may function as catalysts or receptor sites to signal through the plasmalemma. D) They are attached to only one side of the membrane. E) None of the answers are correct. - Ans:-d Substances that enter the cell usually do so through the A) cholesterol. ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 4/26 B) glycocalyx. C) glycolipids. D) integral proteins. E) peripheral proteins. - Ans:-d The general functions of the plasmalemma include A) physical isolation of the cell contents from the extracellular fluid. B) regulation of exchange of materials with the environment. C) sensitivity to changes in the extracellular fluid. D) structural support of the cell. E) All of the answers are correct. - Ans:-e Which statement describes how the plasmalemma is used in communication and sensitivity? A) It serves as a storage site for large amounts of proteins for future use by the cell. B) It effectively isolates the cytoplasm from the surrounding fluid environment. C) It contains gated channels that can be opened or closed to regulate the passage of materials. ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 5/26 D) It acts as a site for the attachment of glycoproteins and glycolipids, which act as receptors for molecules present in the extracellular fluid. E) It provides for specialized connections between neighboring cells. - Ans:-d Because the plasmalemma blocks some substances and allows others through, it is referred to as being A) structurally rigid. B) impermeable. C) selectively permeable. D) freely permeable. E) both structurally rigid and selectively permeable. - Ans:-d Which of the following is a passive process for material movement across a plasmalemma?