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- QUESTION 20 You are studying the effects of removing integrins from cells. Which of the following abilities is the cell most likely to lose? A The cells are going to lose their ability to make connections with the ECM. B The cells will lose their ability to secrete growth factors. C The cells are going to lose their ability to form cell-cell adhesions. D The cells are going to lose their ability to communicate with the cytoskeleton.QUESTION NO. 1Statements: (1) Glucose is both a hexose and a aldose. (2) There can never be more than three enantiomers for a molecule. (3) All common disaccharides have beta-one-four linkages. Which statements are true?QUESTION NO.2 Erythrocyte glucose transporter illustrates the type of A. ion driven active transport B. facilitated diffusion C. active transport D. simple diffusion E. secondary active transportQUESTION NO.3 which of the following statement/s accurately describe the surface of a lipid droplet? A. a monolayer of phospholipids B. a bilayer of phospholipid C. a network of perilipin protein D. a structured layer of triacylglycerol E. a chaotic hydrophobic/ hydrophilic interfaceQUESTION 18 Which of the following are features of the basement membrane but not the ECM? A Contains both laminins and fibrillar collagens (e.g. collagen I and III). B Contains all types of collagens. C Contains both laminin and network-forming collagens (e.g. collagen IV). D Contains network-forming collagens (e.g. collagen IV) E Contains fibrillar collagens (e.g. collagen I and III).
- Question: A cell membrane is ______________? a. Permeable b. Semipermeable c. Nonpermeable d. None of the above.Question 33 Which of the following is true about the movement of ions across excitable living membrane? A) Ions always move actively across membranes through leakage channels B) Ions always move from an area of higher concentration to an area of lower concentration C) Ions always move passively across membranes D) Sodium gates in the membrane can open in response to electrical potential changes Please provide a brief explaination of each one correct or incorrectQUESTION 29 Which of the following is NOT a primary method used to regulate the activity of cyclin-dependent kinases (cdks)? A. Binding to cyclins B. Binding to a CDK inhibitor C. Dephosphorylation of a specific amino acid D. Degradation by a proteasome E. Phosphorylation on a specific amino acid
- QUESTION 32 "The cell volume shrinks, cells lose cell-cell contact, the actin cytoskeleton is fragmented, the cell membrane forms blebs, chromatin is chopped into small pieces, and the cell is eventually phagocytosed" is a description of which of the following cell states? A. G0 B. Quiescence C. Mitosis D. Senescence E. ApoptosisQUESTION 15 Which of the following molecules is NOT a component of desmosomes? A Intermediate filaments B Actin C Plakoglobin D Desmoplakin E DesmocolinQuestion 17 Which of the following activities are present in the endomembrane system organelles? I. glycoprotein synthesis II. calcium sequestration III. glycosylation IV. di-sulfide bond formation and protein folding I, II, III, Iv II, III, IV only I, II, III only I, II, IV only
- QUESTION 38 The following statement: Overall polarity/asymmetry of structure when subunits are polymerized applies to... actin/microfilaments tubulin/microtubules both cytoskeletal systemsQUESTION 19 Match the cellular junction with its characteristic (side of cell, cellular role, intracellular connection or transmembrane protein) tight junctions focal adhesions desomsomes gap junctions A. integrins link the actin-myosin stress fibers to the extracellular matrix B. connexons form pores between cells in an epithelial sheet or tube C. link the intermediate filaments of neighboring cells using homophilic cadherin-cadherin binding D. occludins bind to occludins and prohibit the diffusion of membrane proteins from the baso-lateral surface to the apical surface of epithelial cellsQUESTION 31 Protein makes up what percentage of the mass of the plasma membrane in a typical cell (e.g. red blood cells)? 80% 20% 50% 2%