Please answer the true and false questions Which of the following is not true of
ID: 86837 • Letter: P
Question
Please answer the true and false questions Which of the following is not true of the basal lamina? a) It is the structure upon which epithelial cells rest B) It contains osteoblasts C) Its composed of collagen and D) Epithelial cells attach to it through the hemidesomosomes Clathrin coat proteins remain around the vesicle after it has budded off from the membrane. Proteins have to be unfolded in order to be transported into the nucleus through the nuclear pore Phagocytosis is the ingestion of large particles, such as bacteria, into vesicles. T-SNARE protein on the vesicle binds V-SNARE protein on the target membrane Misfolded proteins are degraded in the lumen of the endoplasmic reticulum Pseudopodia are stubby, three-dimensional membrane protrusions During muscle contraction the length of the actin filaments in the sarcomere decreases Integrin adhesion proteins are found in focal adhesions Bending of the cilium is dependent on the dynein motor protein Cadherin proteins are found in tight junctions.Explanation / Answer
1-False- Clathrin-mediated endocytosis remains the best studied. Clathrin-mediated endocytosis of many receptor types begins with ligand binding its receptor. The ligand and receptor (sometimes bound to an adaptor protein) then diffuse through the plasma membrane until captured by a preformed or forming clathrin-coated pit.Other receptors can nucleate a clathrin-coated pit allowing formation around the receptor. A mature pit will pinch off from the plasma membrane forming a clathrin-coated vesicle that then uncoats and typically fuses to an early endosome. Once fused the endocytosed cargo (receptor and/or ligand) can then be sorted to lysosomal, recycling, or other trafficking pathways
2-True
3-True-Phagocytosis is the process in which a cell engulfs a particle, digests it, and expels the waste products. Process of phagocytosis:
4-FALSE-SNAREs can be divided into two categories: vesicle or v-SNAREs, which are incorporated into the membranes of transport vesicles during budding, and target or t-SNAREs, which are associated with nerve terminal membranes
5-True
6-True-Pseudopods or pseudopodia are temporary cytoplasm filled projections of eukaryotic cell membranes or unicellular protists. They may be used for motility, or ingesting nutrients or other particulate matter. Cells that possess this faculty are generally referred to as amoeboid
7-True
8-True
9-True-Bending of the cilium is dependent on dynein motor protein
10-False-Adherens junctions initiate cell–cell contacts, and mediate the maturation and maintenance of the contact. Adherens junctions consist of the transmembrane protein E-cadherin, and intracellular components, p120-catenin, -catenin and -catenin. Tight junctions regulate the paracellular pathway for the movement of ions and solutes in-between cells. Tight junctions consist of the transmembrane proteins occludin and claudin, and the cytoplasmic scaffolding proteins ZO-1, -2, and -3