60. Which cells of the epidermis are part of the immune system? A. keratinocytes
ID: 271754 • Letter: 6
Question
60. Which cells of the epidermis are part of the immune system? A. keratinocytes B. melanocytes C. Langerhan's cells D. Merkel's cells E. fibroblasts 61. Plasma membrane phospholipids A. have polar (charged) tails. B. are arranged in a single layer. C. have tails that face the exterior of the membrane. D. are 95% cholesterol. E. have a hydrophilic head and hydrophobic tails. 62. Which of the following pairs is mismatched? A. synthesis reaction - two reactants combine to form a larger product B. decomposition reaction - large reactant broken into smaller products C. oxidation- gain of electrons D. dehydration reaction - water is a product of the reaction E. hydrolysis- water is used in decomposition reaction 63. The nucleus of a cell functions to A. digest lipids. B. produce ATP. C. produce secretory vesicles. D. control and coordinate cellular activities. E. synthesize proteins. 64. Ribosomes are organelles responsible for A. protein synthesis. B. manufacturing lipids. C. cell movement and cell shape. D. packaging "cell products" for export. E. energy production.Explanation / Answer
60. The correct answer is option C – Langerhans cells
These cells are part of the dendritic cell family. They are present in the basal and suprabasal layers of the epidermis, and the respiratory epithelium, as well as those of the digestive and the urogenital tracts. The main function of these cells is to act as antigen-presenting cells, and they belong to the skin immune system (SIS).
61. The correct answer is option E – Hydrophilic head and hydrophobic tail
The phospholipids are a diverse family of lipids that are arranged in a bi-layer on the cell membrane. Their polar head region faces both the cytoplasm, and the external aqueous external medium. Their role is to protect the internal composition of the cell, as well as selectively transport nutrients and solutes inside the cell.
62. The correct answer is option C- Oxidation: gain of electrons
Oxidation is actually the loss of electrons. The gain of electrons is called reduction.
63. The correct answer is option D - Control and coordination of cellular activities.
The nucleus can be thought of as the ‘control centre’ of the cell. It dictates which genes are to be turned on and off to regulate various physiological activities in the cell. Lipid digestion is done by enzymes secreted in the stomach. Production of ATP is done by mitochondria. Golgi bodies produce secretory vesicles. The production of proteins is done by the endoplasmic reticulum and the ribosomes.
64. The correct answer is option A – Resposible for protein synthesis
Ribosomes, along with Endoplasmic reticulum are responsible for protein synthesis.
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