If GTP hydrolysis occurs on a tubulin molecule at the plus end of a microtubule protofilament before another tubulin molecule is added, what typically happens? the GDP is rapidly exchanged for a fresh molecule of GTP the microtubule depolymerizes the microtubule polymerizes the microtubule is stabilized the protofilaments assemble into a hollow tube

If GTP hydrolysis occurs on a tubulin molecule at the plus end of a microtubule protofilament before another tubulin molecule is added, what typically happens? the GDP is rapidly exchanged for a fresh molecule of GTP the microtubule depolymerizes the microtubule polymerizes the microtubule is stabilized the protofilaments assemble into a hollow tube

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter6: Reproduction At The Cellular Level

Section: Chapter Questions

Problem 11RQ: FtsZ proteins direct the formation of a ________ that will eventually form the new cell walls of the...

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Which of the following is reponsible for the synthesis of proteinsthat are being exported from the cell?a. smooth ERb. rough ERc. lysosomed. peroxisome
In plant cells, the function of the lysosomes is carried outby __________.a. vacuolesb. peroxisomesc. ribosomesd. nuclei
In lysosomes there are many different enzymes that break down e.g. proteins, fats, etc. If a lysosome breaks down, what protects the rest of the cell from the enzymes in the lysosome?
Which type of cytoskeletal element is characterized as a hollow, rigid cylindrical tube with walls composed of tubulin subunits? a) microfilamentsb) microtubulesc) intermediate filamentsd) all of these choicese) minitubules
If a cell's lysosomes burst, the cell would ______. digest itself divide into two cells shrivel need to manufacture more lysosomes
Which of the following statements regarding microtubules is FALSE? Microtubules are typically arranged in cells such that thoir plus (+) ends are directed towards the plasma membrane and their minus (-) ends are attached to the centrosomes. Microtubules are composed of 13 protofilaments that are arranged into a hollow cylinder. Microtubules are polar. Microtubule-binding proteins, such as Tau, bind to microtubules to destabilizo thom. Microtubules are inherently unstable and rapidly disassemble with low/ GTIP concentrations.
Vacuoles are fluid-filled organellespresent in some cells.Which function isNOT normally performed by vacuoles?
Each of the following is part of the endomembrane system, _except_ A) Golgi complex B) endosomes D) peroxisomes E) zymogen granules
What controls the passage of molecules into and out ofthe nucleus?a. endoplasmic reticulum, an extension of the nucleusb. nuclear pores, which consist of membrane proteinsc. nucleoli, in which ribosome subunits are maded. dynamically assembled microtubulese. tight junctions
Cells specialized for absorption of matter from the ECF are likely to show an abundance of:- a. lysosomes. d. secretory vesicles. b. microvilli. e. ribosomes. c. mitochondria
In a given sample (whole organism, tissue, cell, subcellular compartment), what fraction of the whole proteome is expressed (i.e., which proteins are present)?
How does a cell maintain theright amount of every component(organelles, molecules), and how doesit change these amounts as needed(for example, to greatly expand theendoplasmic reticulum when the cellneeds to produce large amounts ofsecreted proteins)?