Question 24 (Select all that are correct) Which ones of the following statements are true? Mesenchymal stem cells are a type of pluripotent cells Growing stem cells in vitro (outside of the body) is difficult because they tend to differentiate spontaneously stem cells can be extracted from bone marrow Human mesenchymal Mesenchymal stem cells can differentiate into blood cells The natural skin tissue has a unique single-layer structure

Question 24 (Select all that are correct) Which ones of the following statements are true? Mesenchymal stem cells are a type of pluripotent cells Growing stem cells in vitro (outside of the body) is difficult because they tend to differentiate spontaneously stem cells can be extracted from bone marrow Human mesenchymal Mesenchymal stem cells can differentiate into blood cells The natural skin tissue has a unique single-layer structure

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter4: Cell Structure

Section: Chapter Questions

Problem 13RQ: Tay-Sachs disease is a genetic disorder that results in the destruction of neurons due to a buildup...

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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 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. Apoptosis
QUESTION 14 Which of the following statements is FALSE? A Microtubules will rapidly disassemble in response to a drop in the ATP concentration. B G-actin monomers and alpha-tubulin/beta-tubulin dimers assemble into filaments in their ATP-bound and GTP-bound forms, respectively. C Microtubules are stabilized by microtubule-binding proteins, such as Tau. D Actin-binding proteins allow F-actin to assemble in cells in many different ways. E Hydrolysis of ATP and GTP changes the conformation of the monomers once they are incorporated into actin filaments and microtubules, respectively.
QUESTION 33 Of the following cell types, which one would be most likely to exist in the G0 state? A. An epithelial cell in the intestine of a developing embryo B. A primary spermatocyte C. An intestinal epithelial cell line growing rapidly in a cell culture dish D. A differentiated intestinal epithelial cell in an adult
QUESTION 32 All living organisms, including both bacteria and Eukaryotes have: (Select all that apply) the ability to extract energy from the environment to do work Ribosomes double stranded DNA L-amino acids Peptidoglycan Nuclei D-monosaccharides Plasma membranes made of phospholipids Robust cytoskeleton, including actin and microtubules
QUESTION 38 The following statement: Overall polarity/asymmetry of structure when subunits are polymerized applies to... actin/microfilaments tubulin/microtubules both cytoskeletal systems
QUESTION 15 Which of the following molecules is NOT a component of desmosomes? A Intermediate filaments B Actin C Plakoglobin D Desmoplakin E Desmocolin
QUESTION 30 Which of the following methods can be used to regulate the activity of cyclin-dependent kinases (CDKs)? A. Phosphorylation at a specific amino acid B. Dephosphorylation at a specific amino acid C. Binding to cyclins D. A, B and C E. A and C
QUESTION 35 What event occurs to divide the sister cells in two during cytokinesis? A. Constriction of the cell body by the sliding of myosin filaments on actin filaments. B. Contraction of the cell body by the shortening of actin and myosin filaments. C. Contraction of the cell body by shortening of the microtubules. D. Dissolving of the cytoplasm at the center of the cell body followed by polymerization of new actin filaments.
QUESTION 39 The following statement: Polymer provides tracks for dyneins applies to... actin/microfilaments tubulin/microtubules both cytoskeletal systems
QUESTION 28 Which of the following is the primary method by which cyclin proteins are regulated to influence entry into the cell cycle or transition from one stage to the next? A. Transcriptional upregulation and translation followed by targeted ubiquitin-mediated degradation by a proteasome. B. Phosphorylation to regulate the activity of the kinase site. C. An activating phosphorylation and an inactivating phosphorylation. D. All of these are mechanisms that can be used to regulate cyclins.
QUESTION 2 [20]In your own words explain the term “phagocytosis” and discuss the three (3) stages that are involved in the process