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

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter3: Cell Structure

Section: Chapter Questions

Problem 13SQ

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Similar questions

Tissue boundaries are established based on the types of present of the cell membrané. fibronectin lipids integrin D) cadherin E glycolipid
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 substance on the plasma membrane helps identify chemical signals from outside the cell? O transport protein O lipids O glycoprotein O cholesterol
Plasmodesmata are channels composed of plasma membrane, SER, and cytoplasm. O True O False
Which substance on the plasma membrane helps identify chemical signals from outside the cell? O transpoit protein O lipids O glycoprotein O cholesterol
Which of the following is NOT correct: The quantity of ER inside a cell fluctuate depending on cell size ER allowing molecules to move from one part of the cell to another The ER function is act as an internal transport system short polypeptides containing less than 20-30 amino acids called .. O oligopeptides O polypeptide O long chain of protein
Endocytosis, is the process where the cell engulfs cell surface receptors bound with ligands; whereas phagocytosis is the process where the cell uptakes particulate matter False O True
What type of movement is passive and down a concentration gradient? O None of these is correct O Facilitated diffusion O Active transport O Phagocytosis O Simple diffusion
Which of the following statements related to intercellular junctions is false? Cadherins are important cell-cell adhesion proteins. A cadherin-mediated junction involves many cadherin molecules to achieve strong adhesion. The cytoplasmic domain of cadherins interacts with actin or intermediate filament cytoskeleton through adaptor proteins. Because tight junctions seal the membrane of adjacent epithelial cells, transmembrane proteins in the apical portion of the plasma membrane cannot move to the basal lateral domain or vice versa. Proteins can diffuse through an open gap junction.
Which of the following cell junctions are involved with anchoring of the cell to the extracellular matrix? Select all that apply Desmosomes Gap Junctions Hemidesmosomes Adherens junctions
The role of proteins in a cell include the following (choose all that apply) identifying self and distinguishing it from an invading organism none of the answers is correct O making up the phospholipid bilayer O transporter molecules embedded in the cell membrane O a means of locomotion
The cell membrane controls what enter and ex its the cell. O True O False