What are centrioles?
Paired organelles that organize spindle microtubules that attach to chromosomes during mitosis
The area next to the nucleus that contains the centrioles is called the ____.
Centrioles are only visible in a cell when that cell is doing what?
What is referred to as the "colored stuff" fund in the nucleus & consisting of uncoiled chromosomes & assoc proteins?
What structure acts to suspend cellular organelles & contains enzymes that mediate cytosolic reactions such as glycolysis or fermentation?
What is the function of the cytoskeleton?
Provides structural support for the cell.
What 3 things compose the cytoskeleton?
T or F; The cytoskeleton is not generally visible under the light microscope
What occurs in the smooth ER?
Detox of drugs and alcohol
What processes occur in the RER?
Synthesis of proteins destined for the cell membrane, lysosomes or secretion
In neurons the RER stains very dark & is called ___ substance.
The ___ ___ is a stack of flattened membranes.
Which organelle receives proteins fr the RER & then modifies, packages & sorts for delivery to other organelles or the plasma membrane?
Lysosomes are what?
Membrane enclosed sacs containing digestive enzymes
The function of a lysosomes is to what?
Breakdown intracellular debris
What organelle is the powerhouse" of the cell?
Cellular respiration occurs in the ____.
Define cellular respiration.
Metabolic pathway that utilizes O2 in breakdown of food molecules to produce ATP
What are the 2 functions of the nucleolis?
Assembles ribosomes in the nucleus
What is contained within the nucleus?
A cells genetic material (DNA)
Membrane enclosed sacs that contain catalase & other oxidative enzymes are called ___.
Peroxisomes utilize enzymes to break down lipids & toxic substances how?
1st converting them to H2O2 then breaking down H2O2 into water & O2
What provides a selectively permeable barrier between intracellular and extracellular environments of the cell?
What occurs in the ribosomes?
Fixed ribosomes can be found where?
Attached to RER
Where are free ribosomes found?
Floating within the cytoplasm
What does the nucleus look like under a light microscope?
A very dark stained feature in the center of a cell
How do we recognize the nucleolus in a cell?
Sm dark circular structure within the nucleus
Can we view the plasma membrane w/a light microscope?
No, only with electron microscopy however outer border of cell where it is located IS often visible