Question

For each of the following, decide whether it applies to actin filaments, intermediate filaments, and/or microtubules....

  1. For each of the following, decide whether it applies to actin filaments, intermediate filaments, and/or microtubules. NOTE: there may be multiple answers for each statement.
  1. Found in the nucleus and cytoplasm

ANSWER:

  1. Involved in the transport of vesicles and organelles

ANSWER:

  1. Associate with proteins that help adhere cells to the extracellular matrix

ANSWER:

  1. Their stability is influenced by nucleotide hydrolysis

ANSWER:

  1. Directly involved in phagocytosis

ANSWER:

  1. Can associate into bundles with the help of other proteins

ANSWER:

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Answer #1

1- Found in the nucleus and cytoplasm

ANSWER- All 3 protein filaments, microtubules, intermediate filaments, and microfilaments are found in the cytoplasm and near the nucleus.

2-Involved in the transport of vesicles and organelles.

ANSWER- Microtubules:- These are the thickest cytoskeleton and are involved in the intracellular translocation of vesicles and organelles.

3- Associate with proteins that help adhere cells to the extracellular matrix

ANSWER- Actin filaments- They associate with proteins aiding adherence to the extracellular matrix.

intermediate Filaments- In hemidesmosomes the integrin proteins link ntermediate filament with the extracellular matrix.

Microtubules - They are the structural component of cilia and flagella which are the locomotory organ used for adherence

Hence all the 3 cytoskeletons are associated with protein to aid adherence to the extracellular matrix

4- Stability is measure by hydrolysis of a nucleotide

ANSWER- Microtubules and actin filaments -These two polymers are assembled with energy expenditure.

5-Directly involved in phagocytosis

ANSWER- The actin cytoskeleton is directly involved in the phagocytosis during signal transduction.

6-Can associate into bundles with the help of other proteins.

ANSWER - All the three microtubules, intermediate filament, and actin filament can associate into bundles with the help

of other proteins.

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