Chapter 6(2) - Chapter 6 A Tour of the Cell 6.6-6.7...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 6 A Tour of the Cell 6.6-6.7
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cytoskeleton Network of fibers microtubules microfilaments intermediate filaments
Background image of page 2
Function of the Cytoskeleton Support Maintain shape Animal cells lack a cell wall Motility Changes in cell location Movement of parts of the cell Involve Motor proteins Regulation
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Components of the Cytoskeleton Microtubules - 25 nm diameter hollow Subunits are Tubulin dimers Microfilaments – 7 nm diameter 2 actin strands Intermediate filaments – 8-12 nm diameter keratin type proteins
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Components of the Cytoskeleton Microfilaments two intertwined strands of actin 7nm diameter actin subunits Functions maintenance of cell shape Changes in cell shape Muscle contraction cytoplasmic streaming cell motility (pseudopodia) Cell division – cleavage furrow
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Centrosomes and Centrioles Animal Cells centrosome– near the nucleus; microtubule organizing center contains a pair of centrioles at right angles to one another
Background image of page 10
Cilia and Flagella Specialized arrangement of microtubules motility Flagella – few in number, longer 9+2 Cilia – many per cell, shorter 9+2 or 9+0 – ONE per cell; “antennae” transmit signals from the environment to the interior
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Fig. 6-23 5 µm Direction of swimming (a) Motion of flagella Direction of organism’s movement Power stroke Recovery stroke (b) Motion of cilia 15 µm
Background image of page 12
Fig. 6-24 0.1 µm Triplet (c) Cross section of basal body (a) Longitudinal section of cilium 0.5 µm Plasma membrane Basal body Microtubules (b) Cross section of cilium Plasma membrane Outer microtubule doublet Dynein proteins Central microtubule Radial spoke Protein cross- linking outer doublets 0.1 µm
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cilia and flagella share a common ultrastructure: A core of microtubules sheathed by the plasma membrane A basal body that anchors the cilium or
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/20/2012 for the course BIOLOGY 1305 taught by Professor Adair during the Spring '09 term at Baylor.

Page1 / 37

Chapter 6(2) - Chapter 6 A Tour of the Cell 6.6-6.7...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online