lecture test 2 ch.3
5 Written Questions
5 Matching Questions
- Endoplasmic reticulum
- light microscope
- a (endoplasmic - within the cytoplasm; reticulum - network) p. 54
1. Complicated system of membranous channels and saccules (little membrane bound sacs) and
tubules (little tubes).
2. Continuous with the outer layer of the nuclear envelope.
3. Rough ER: ER with attached ribosomes. Involved in protein synthesis (provides a "work
surface" for ribosomes), modification of newly formed protein (Ex.: glycoprotein - protein
- b disproved the theory of spontaneous generation (life from non-life), a view held even by scientists for many centuries.
- c stated that cells come only from pre-existing cells (biogenesis: life
begins from life).
- d first described living cells.
- e gives a view of general detail at the cell level--not much of internal cell
structure. Resolution to 0.2 microns. Limited by the wavelength of visible light. Magnification
limit about 1500 X (Most microscopes available provide 1000X.)
Photomicrograph: picture taken through a light microscope.
5 Multiple Choice Questions
- 1. Membrane bound vesicles (vesicle = little vacuole) within the cytoplasm; produced by the Golgi
2. Contain digestive enzymes.
a. Function in digestion:
Phagocytosis (cell feeding): a process by which some cells engulf particles. White blood
cells may engulf bacteria; some protozoans engulf food particles.
b. These particles are taken into the cell into a membrane bound vacuole (note food vacuole
in Protozoa Lab material). A lysosome fuses with the vacuole and the contents are
c. Function in autodigestion (self digestion): "housekeeping" digestion of worn out cell parts.
- first used word cell to describe the compartments he saw in cork under
- [true nucleus] possessing a membrane-bound nucleus and other organelles:
a. DNA is located in a membrane bound structure called the nucleus.
b. Organelles: specialized structures in the cell performing specific cellular functions.
c. Examples: the four kingdoms of Domain Eukarya: Plantae, Animalia, Fungi, Protista.
- ovum (egg) = 140 ìm, a pinpoint just visible with good
- Prokaryotic Cells: 1 - 10 microns in diameter.
Eukaryotic Cells: 10 - 100 microns.
5 True/False Questions
Centrioles → similar to lysosomes; contain enzymes that form hydrogen peroxide; especially
prevalent in cells that are synthesizing or breaking down fats.
chromatin → long threadlike strands of genetic material in a non-dividing cell.
unicellular → having or consisting of a single cell
nuclear pores → structures in the nuclear envelope that allow passage of certain materials between the cell nucleus and the cytoplasm
electron microscope → Uses a beam of electrons for illumination instead of visible light. Provides a highly detailed
view of cell structure.