Histology NBME Exam Questions with Correct Answers

Hematoxlyin and Eosin Correct Answer 1. Hematoxylin = basic dye stains acidic molecules like nucleus, DNA, RNA 2. Eosin = acidic dye stains basic molecules like cytoplasm Plasma membrane Correct Answer lipid bilayer in which proteins are embedded -has 2 layers 1. hydrophilic = head 2. hydrophobic = tail 2 types of proteins in plasma membrane: 1. Integral membrane proteins = inside the plasma membrane 2. Peripheral membrane proteins = outside of the membrane *steroids are lipid soluble molecule, anything that is lipid soluble can pass through the lipid bilayer* B-galactosidase Correct Answer An enzyme located in lysosomes breaks down lactose -activity at the cell surface of enterocytes Enterocytes Correct Answer specialized absorptive cells in the villi of the small intestine Merkels cells Correct Answer detect light touch and superficial pressure Langerhans cells Correct Answer special macrophages that serve as antigen-presenting cells in the skin Types of collagen Correct Answer type 1 - bone type 2- cartilage type 3 - reticular fibers type 4 - basement membrane Respiratory flow Correct Answer Trachea Primary bronchi Secondary bronchi Tertiary bronchi Respiratory bronchioles Alevolar ducts