LAB #3
osmosis
(movement of water through cell membrane) follows this same pattern; isotonic, same number of water molecules in and outside of cell; hypotonic, the solution has a lower solute concentration, water moves into the cell, and the cell bursts; hypertonic, the solution has a higher solute concentration, water moves out of the cell, and the cell shrivels
phospholipid bilayer
a structure that barriers between the inside and outside of the cell and have a hydrophilic heads and two hydrophobic tails
When you want to view a specimen with a compound light microscope using the 40x objective lens you should - start with the 10x objective to center your specimen and work your way up - start with the 40x objective since that is the one you want to use - start with the 100x objective since it is the scanning -power objective - always start with the 4x objective to center your specimen and work your way up, focusing each objective and moving on
always start with the 4x objective to center your specimen and work your way up, focusing each objective and moving on
Which of the following best describes the appearance of amyloplasts in potato cells stained with iodine? - currents of green round dots - bricks in a wall - bundles of grayish-white to lavender to blackish-purple pebbles - flattened fried egg-like shapes with darker centers
bundles of grayish-white to lavender to blackish-purple pebbles
Why might the cell theory actually be considered a law? - cell theory explains why cells exist - cell theory has been proven and is now considered a law - cell theory just has a few more tests to pass before it can be certified as a law - cell theory describes a repeated pattern in nature
cell theory describes a repeated pattern in nature
After a long period of coevolution, the photosynthetic bacterium consumed by the predatory cell became the cellular organelle know and the - endoplasmic reticulum - mitochondrion - nucleus - centriole - chloroplast
chloroplast
stressors
extreme temp or pH (denature), chemicals, solvents, and detergents (dissolve lipids and create holes), and alcohols
All specimens for Lab 3 should be viewed and drawn at 40x, 100x, and 400x - true - false
false
Several drops of each stain should be added to a blank slide before applying a specimen. After the specimen is added, distilled water should be used to dilute the stain before adding a cover slip - true - false
false
You must draw everything that you see in your field of view - true - false
false
Some bacteria contain appendages such as _______________, which are long whip-like structures to aid in locomotion, fimbriae, which are small bristle-like fibers to function in attachment, or conjugation pill, which are short tubular structures to aid in the exchange of genetic material
flagella
Which of the specimens viewed in Lab3 had cells identifiable as eukaryotic? - bacteria - human check cells - yeast - potato - onion - Elodea
human check cells, yeast, potato, onion, Elodea
The plant cell wall - makes food by converting light energy to chemical energy - is very similar to the animal cell wallis found just inside the plasma membrane - regulates the composition of the cytoplasm - is a protective structure made of cellulose fibrils
is a protective structure made of cellulose fibrils
passive transport
molecules move against the gradient and requires ATP
The DNA of a prokaryote is arranged in a single coiled chromosome located in the
nucleoid
Prokaryotes are surrounded by a ________________ ____________________ that regulates the entry and exit of materials through the cell wall to help maintain cell shape and structure, and the _______________, which increases the ability of pathogenic bacteria to cause disease
plasma membrane, capsule
Some prokaryotes carry genes on extrachromosomal pieces of circular DNA called
plasmids
Embedded within the cytoplasm are small organelles composed of rRNA and protein called ___________________ that function in protein synthesis
ribosomes
Which of the following structure(s) is/are found in prokaryotic cells? - ribosomes - endoplasmic reticulum - nucleus - mitochondria
ribosomes
transports
small,non-polar molecules can pass through cell membrane, but large, charged molecules must move through passive or active transport
polarity
the charge of a molecule, no charge=no-polar and charged=polar
Some prokaryotes, such as cyanobacteria, are photosynthetic and contain ___________________ to aid in photosynthesis
thylakoids
It is ok to view the cheek cells slides other students have made even though they are considered biohazardous - true - false
true
You will need to wear gloves during lab 3 - true - false
true
If you get a foreign substance into your eye or eyes on accident, then what should you do? - all stated answers are correct- run to the bathroom - rub them vigorously with your hands - use the eyewash station located at the sink in the classroom to flush them well
use the eyewash station located at the sink in the classroom to flush them well
active transport
when molecules move along the gradient (high to low)