Concept explainers
SCIENTIFIC INQUIRY Although both ends of a microtubule can gain or lose subunits, one end (called the plus end)
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- Match each term with its best description. ___ cell plate a. lump of cells ___ spindle b. made of microfilaments ___ tumor c. divide plant cells ___ cleavage furrow d. spindle originates here ___ contractile ring e. dangerous metastatic cells ___ cancer f. made of microtubules ___ centrosomes g. indentation ___ telomere h. shortens with agearrow_forwardThe subunits of which filament bind to GTP, a condition that favors the polymerization of the cytoskeletal subunits? O Intermediate filaments Microfilaments O Microtubulesarrow_forwardWhat is the function of the nuclear matrix?arrow_forward
- Put the following in order of size from smallest to largest microtubules sarcomere intermediate filaments microfilaments dynienarrow_forwardScientists often extract DNA from the nucleus of cells for analysis or use. This process breaks the cell membrane, spins the solution to remove the large particles through high g-force, adds alcohol to make the DNA less soluble aqueous solution, then spins the solution again to pull the DNA out of solution. Consider a cell in metaphase compared to a cell in rest (not in the cell cycle leading to cell division). What properties of a metaphase cell might let you extract more DNA compared to the resting cell? Are there any that might make the extraction more difficult?arrow_forwardMicrotubules within a cell appear to be arranged in specific arrays. What cellular structure is responsible for determining the arrangement of microtubules within a cell? How many of these structures are found in a typical cell? Describe how such structures serve to nucleate microtubule assembly.arrow_forward
- + 1. What are the components of the cytoskeleton in an animal cell? Fill in the table below to explain: Type of Cytoskeletal Structure Subunits and Shape Size (smallest, intermediate, largest) Function(s) Associated Motor Proteins Microtubules Intermediate Filaments n/a Microfilaments 0arrow_forwardHow many of the following are present in a long and growing microtubule (with no motor proteins)? I. GTP II. GDP III. ATP IV. ADP O 4 O 2 3. O 1arrow_forwardBased on the motors moving along the microtubule in the center of the field, would you propose: That a single microtubule can accommodate motors moving in both directions, or not? That all of the motors moving along a single microtubule move at the same speed, or not?arrow_forward
- Which of the following statements applies to all three major classes of cytoskeletal polymers (microtubules, actin filaments and intermediate filaments)? They have intrinsic polarity They assemble from protein subunits synthesized on free polyribosomes They add subunits only at their ends They are involved in cell motility Their constituent proteins are tissue specificarrow_forwardCytoskeleton proteins that form cleavage furrow during cytokinesis is: intermediate filaments, actin filaments, myosin filaments, vimentin filaments, or microtubules?arrow_forwardWhich of the following statements regarding cytoskeletal filaments is FALSE? Microtubules will rapidly disassemble in response to a drop in the ATP concentration. G-actin monomers and alpha-tubulin/beta-tubulin dimers assemble into filaments in their ATP-bound and GTP-bound forms, respectively. Microtubules are stabilized by microtubule-binding proteins, such as Tau. Actin-binding proteins allow F-actin to assemble in cells in many different ways. Hydrolysis of ATP and GTP changes the conformation of the subunits once they are incorporated into actin filaments and microtubules, respectively.arrow_forward
- Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax