What role do the proteins profilin and cofilin play in the cytoskeleton? O Accelerate actin fibre bundling O Cap actin fibres Accelerate actin fibre treadmilling Switch the polarity of the actin fibres Cleave actin protein to active monomers In vertebrates, which cell-cell junction allows for direct chemical communication between adjacent cell cytoplasms, without contact with the extracellular fluid, and is composed of the transmembrane protein connexin? O Desmosome O Gap junctions O Adherens junctions O Tight junctions O Focal adhesions

What role do the proteins profilin and cofilin play in the cytoskeleton? O Accelerate actin fibre bundling O Cap actin fibres Accelerate actin fibre treadmilling Switch the polarity of the actin fibres Cleave actin protein to active monomers In vertebrates, which cell-cell junction allows for direct chemical communication between adjacent cell cytoplasms, without contact with the extracellular fluid, and is composed of the transmembrane protein connexin? O Desmosome O Gap junctions O Adherens junctions O Tight junctions O Focal adhesions

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter2: Cells And Cell Division

Section: Chapter Questions

Problem 2QP: Assign a function(s) to the following cellular structures: a. plasma membrane b. mitochondrion c....

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A plasma membrane ________. a. controls exchanges between the cell and the external environment b. is a mesh of intermediate filaments c. is a type of extracellular matrix
Cytoplasmic extensions of _______ send and receive chemical messages. a. glial cells b. neurons c. fibroblasts d. melanocytes
Most of a membranes diverse functions are carried out by ________ . a. proteins c. nucleic acids b. phospholipids d. hormones
In the fluid mosaic model: plasma membrane proteins orient their hydrophilic sides toward the internal bilayer. phospholipids often flip-flop between the inner and outer layers. the mosaic refers to proteins attached to the underlying cytoskeleton. the fluid refers to the phospholipid bilayer. the mosaic refers to the symmetry of the internal membrane proteins and sterols.
Enzymes. contalned in _______ break down worn-out organelles, bacteria, and other particles. a. lysosomes b. amyloplasts c. endoplasmic reticulum d. peroxisomes
Define the following terms:a. glycocalyxb. extracellular matrixc. cell cortexd. endoplasmic reticulume. ER lumen
which of the following cellular behavior does not directly depend on the cell membrane/ a)cell-cell communication b)DNA replication c)Cell adhesion d)cell sorting e)Cell signaling
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
Which of the following is most likely to have the greatestconcentration of smooth endoplasmic reticulum?a. a cell that secretes enzymesb. a cell that destroys pathogensc. a cell that makes steroid hormonesd. a cell that engages in photosynthesis
Which cell junctions form junctions between cells connected to the cytoskeleton? a. tight junctionsb. hemidesmosomesc. desmosomesd. focal adhesionse. gap junctions
Which of the followings is not true about the function of the Tight Junctions? (LO- K8) They hold the cells together They act as a barrier They help maintain cell polarity They prevent lateral diffusion of proteins, ions, molecules They play an important role in maintaining the blood brain barrier They connect the adjacent cells intercellularly to the intermediate cytoskeletal filaments
Which of the following processes is involved in the bulktransport of molecules out of the cell?a. phagocytosisb. pinocytosisc. receptor-mediated endocytosisd. exocytosise. None of these are correct.