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Chapter 3 Questions

Describe the structure of a cell membrane and explain how this structural organization provides the membrane's function double layer of phospholipid molecules that self assemble///heads form outer and tails form interior
List three functions of membrane proteins receptors for communicating, help move small molecules and ions in and out of membrane, allow cells to touch or bind
Golgi Apparatus sacs that package and modify protein molecules for transport and secretion
Mitochondria sacs that release energy from food molecules and convert the energy into a usable form
Peroxisomes sacs that contain enzymes capable of digesting worn cellular parts
Cilia projections attached beneath membrane that propel fluids
Endoplasmic Reticulum connected sacs, canals, and vescicles that transports materials in the cell and synthesize lipids
Cytoskeleton network of microfilaments and tubules that provide support and structure for the cell
Vescicles sacs that contain substances that recently entered the cell and stores and transports newly synthesized molecules
Ribosomes particles composed of protein and RNA molecules that synthesize proteins
List the parts of nucleus and explain why each is important nucleolus- composed of protein and RNA molecules that is the site of ribosome formation///chromatin-fibers composed of protein and DNA that carries info for synthesizing proteins
Simple diffusion molecules movement through bilayer from region of high con. to low con.
Facilitated diffusion ions move through channels or carrier molecules across membrane from high con. to low con. without energy
filtration hydrostatic pressure forces small substances through a membrane
active transport movement against a concentratin gradient with a carrier protein and energy input (low con. to high con.)
endocytosis the cell membrane engulfs a particle drawing it into the cell
exocytosis a particle exits the cell
Define osmosis movement of water across a selectively permeable membrane into a compartment containing solute that cannot cross the same membrane
Distinguish among hypertonic, hypotonic, and isotonic solutions isotonic-same osmotic pressure of body fluids, hyper-higher, hypo-lower
The period of the cell cycle when DNA replicates is S phase
Describe the events of mitosis in sequence prophase, metaphase, anaphase, telophase
List five factors that control when and if a cell divides telomeres, waxing and waning levels of kinases and cyclins, cell size, hormones and growth factors, space availability
A stem cell self renews
Created by: wmisaacharris