Question

cytoskeleton
an elaborate network of protein structures extends throughout the cytoplasm. this network, or (1. ), acts as a cells “bones and muscles” by furnishing an internal framework that determines cell shape, supports other organelles, and provides the machinery for intracellular (2. ) and various types of cellular movements. from its smallest to its largest elements, the cytoskeleton is made up of microfilaments, intermediate filaments, and microtubules (figure 3.7). although there is some overlap in roles, generally speaking microfilaments (such as actin and myosin) are most involved in cell (3. ) and in producing changes in cell shape. (you could say that cells move when they get their act(in) together.) the strong, stable, ropelike intermediate filaments are made up of fibrous subunits. they help form desmosomes (see figure 3.3) and provide internal guy wires to resist pulling forces on the cell. the tubelike microtubules are made up of repeating subunits of the protein tubulin. they determine the overall shape of a cell and the distribution of organelles. they are very important during cell division (see pp. 82 - 85). centrioles the paired centrioles (sentre-olz), collectively called the (4. ), lie close to the nucleus (see figure 3.4). they are rod - shaped bodies that lie at right angles to each other; internally they are made up of a pinwheel array of nine triplets of fine microtubules. centrioles are best known for their role in generating microtubules and also for directing the formation of the mitotic spindle during (5. ) division (look ahead to figure 3.15, p. 84). cell parts and their structures and functions are summarized in table 3.1

o 1. centrosome 2. cell 3. cytoskeleton 4. transport 5. motility

o 1. cell 2. cytoskeleton 3. transport 4. motility 5. centrosome

o 1. motility 2. centrosome 3. cell 4. cytoskeleton 5. transport

o 1. transport 2. motility 3. centrosome 4. cell 5. cytoskeleton

o 1. cytoskeleton 2. transport 3. motility 4. centrosome 5. cell

Explanation:

The cytoskeleton is the network in question (1). It provides for intracellular transport (2). Microfilaments are involved in cell motility (3). Paired centrioles are called the centrosome (4). They are important in mitotic (cell) division (5).

Answer:

1. cytoskeleton 2. transport 3. motility 4. centrosome 5. cell