Analyze function of lysosomes assignment
Answer is C: polar = hydrophilic head of phosphate, which can dissolve in the aque-
ous extracellular solution because water molecules are polar; non-polar = hydro-
phobic tails of lipid, which being non-polar, cannot dissolve in aqueous solutions.
67. One of the functions of integral proteins in cell membranes is to:
A. Maintain the rigid structure of the cell
B. Support mechanically the phospholipids
C. Interact with the cytoplasm
D. Form channels for transport functions
Answer is D: Some proteins form channels which allow molecules and ions to enter
68. Which one of the following best describes what a cell membrane consists of?
A. Lipids, proteins, ribosomes
B. Lipids, cholesterol, proteins
C. Cholesterol, proteins, cytoplasm
D. Lipids, proteins, cytoplasm
Answer is B: These are the three major constituents. Ribosomes and cytoplasm are
found inside the cell.
69. Which one of the following organelles is considered as the “energy-producing”
centre of the cell?
A. Rough endoplasmic reticulum
B. Golgi apparatus
Answer is C: Mitochondria are where ATP molecules are produced from glucose.
70. What is the major function of lysosomes? They:
A. Package proteins
B. Detoxify toxic substances
C. Catalyse lipid metabolism
D. Digest unwanted particles within the cell
Answer is D: The prefix “lys-” refers to the ability to alter molecules by dividing
them into smaller pieces.
71. What is the purpose of the “sodium-potassium pump”?
A. To perform endocytosis
B. To move sodium and potassium by facilitated diffusion
C. To perform bulk transport through the plasma membrane
D. To produce a concentration gradient for sodium ion
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