Citoesqueleto

Question 1

What is the primary function of the cytoskeleton?

Answer 1

The primary function of the cytoskeleton is to provide structural support, shape, and organization to the cell.

Question 2

True or False: Microfilaments are composed of actin.

Answer 2

True

Question 3

Fill in the blank: Microtubules are primarily composed of __________.

Answer 3

tubulin

Question 4

What are the three main components of the cytoskeleton?

Answer 4

Microfilaments, intermediate filaments, and microtubules.

Question 5

Which component of the cytoskeleton is involved in muscle contraction?

Answer 5

Microfilaments

Question 6

What is the diameter range of microtubules?

Answer 6

Microtubules have a diameter of about 25 nanometers.

Question 7

Multiple Choice: Which of the following is NOT a function of intermediate filaments? (a) Mechanical support (b) Cell motility (c) Anchoring organelles

Answer 7

b) Cell motility

Question 8

What role do microtubules play in cell division?

Answer 8

Microtubules form the mitotic spindle that separates chromosomes during cell division.

Question 9

True or False: Intermediate filaments are more stable than microtubules.

Answer 9

True

Question 10

What are the two main types of microfilaments?

Answer 10

Actin filaments and myosin filaments.

Question 11

Fill in the blank: The dynamic instability of microtubules refers to their ability to __________.

Answer 11

rapidly grow and shrink

Question 12

Which protein is primarily associated with microfilament function?

Answer 12

Actin

Question 13

What is the role of the cytoskeleton in cell signaling?

Answer 13

The cytoskeleton helps transmit signals from the cell surface to the interior, affecting cellular responses.

Question 14

Multiple Choice: Which of the following is a characteristic of microfilaments? (a) Hollow tubes (b) Solid rods (c) Intermediate thickness

Answer 14

b) Solid rods

Question 15

What is the main structural role of intermediate filaments?

Answer 15

To provide mechanical strength and support to cells.

Question 16

True or False: Microtubules are involved in the transport of organelles within the cell.

Answer 16

True

Question 17

What is the role of the centrosome in relation to microtubules?

Answer 17

The centrosome serves as the main microtubule organizing center in the cell.

Question 18

Fill in the blank: The polymerization of actin filaments is regulated by __________.

Answer 18

actin-binding proteins

Question 19

What are the two main types of microtubule-associated proteins?

Answer 19

MAPs (Microtubule-Associated Proteins) and motor proteins.

Question 20

Multiple Choice: Which of the following is a function of microtubules? (a) Cell shape maintenance (b) Muscle contraction (c) Cell division

Answer 20

c) Cell division

Question 21

What is the significance of the plus and minus ends of microtubules?

Answer 21

The plus end is where growth occurs, while the minus end is where disassembly occurs.

Question 22

True or False: Intermediate filaments are not involved in cell motility.

Answer 22

True

Question 23

What is the role of dynein and kinesin in relation to microtubules?

Answer 23

Dynein and kinesin are motor proteins that transport cellular cargo along microtubules.

Question 24

Fill in the blank: The main function of actin filaments is to facilitate __________.

Answer 24

cell movement and shape changes

Question 25

What is the relationship between the cytoskeleton and cellular signaling pathways?

Answer 25

The cytoskeleton interacts with signaling pathways to regulate cell behavior and responses.

Question 26

Multiple Choice: Which component of the cytoskeleton is the largest in diameter? (a) Microfilaments (b) Intermediate filaments (c) Microtubules

Answer 26

c) Microtubules

Question 27

What is the role of the actin cortex?

Answer 27

The actin cortex provides mechanical support and determines cell shape.

Question 28

True or False: Microfilaments can form networks that assist in cellular movement.

Answer 28

True

Question 29

What are lamellipodia and filopodia?

Answer 29

Lamellipodia are broad, sheet-like extensions, while filopodia are thin, spike-like extensions formed by actin filaments.

Question 30

Fill in the blank: The primary function of the nuclear lamina is to provide __________ to the nucleus.

Answer 30

structural support

Question 31

What type of cell junctions are associated with intermediate filaments?

Answer 31

Desmosomes

Question 32

Multiple Choice: Which of the following is a characteristic feature of microtubules? (a) They are dynamic (b) They are rigid (c) They are fixed in length

Answer 32

a) They are dynamic

Question 33

What is the role of actin in cell division?

Answer 33

Actin forms the contractile ring that helps separate daughter cells during cytokinesis.

Question 34

True or False: Microtubules are static structures that do not change.

Answer 34

False

Question 35

What is the function of the mitotic spindle?

Answer 35

To segregate chromosomes during cell division.

Question 36

Fill in the blank: The process of microtubule assembly is known as __________.

Answer 36

polymerization

Question 37

What is the significance of the actin-myosin interaction?

Answer 37

It is crucial for muscle contraction and various cellular movements.

Question 38

Multiple Choice: Which cytoskeletal component is involved in intracellular transport? (a) Microfilaments (b) Intermediate filaments (c) Microtubules

Answer 38

c) Microtubules

Question 39

What is the role of spectrin in the cytoskeleton?

Answer 39

Spectrin is involved in maintaining the shape and stability of the plasma membrane.

Question 40

True or False: Microtubules are essential for maintaining cell shape.

Answer 40

True

Question 41

What is the primary structural protein of intermediate filaments?

Answer 41

Vimentin, keratin, or neurofilament proteins, depending on the cell type.

Question 42

Fill in the blank: Microtubules are organized into __________ structures.

Answer 42

hollow cylindrical

Question 43

What is the role of the extracellular matrix in relation to the cytoskeleton?

Answer 43

The extracellular matrix provides external support and interacts with the cytoskeleton to influence cell behavior.