Lab Quiz. 5

Bacterial cells occur in one of the three shapes

coccus, bacillus, spirillum

coccus

spherical-shaped bacteria

bacillus

rod-shaped bacterium

spirillum

comma shape (virgo) or corkscrew shaped

What is detain used for when observing a specimen?

slows down rapid movement of protozoans to permit more detailed observations

For which organisms will we be using Detain?

Paramecium (Alveolata)

Amoeba requires detain.

F

What structures are found in plant cells that are not found in animal cells?

Plant cells— rigid cellulose cell wall

Chloroplasts organelles

Liquid filled central vacuole

Animal cells have… which plant cells do not have.

Centrioles

More lysosomes than plant cells

centriole

cylindrical structures composed of nine triplet microtubule 'blades' organized around a central cartwheel

In what type of organisms are heterocysts found?

Fialmentous bacteria, Anabaena 

What is the function of a heterocyst?

performs nitrogen fixation when there is a lack of fixed

How do you prepare a wet mount for observing an amoeba? (steps 1)

place a drop of water on clean slide & place specimen in the drop of water (if using a suspended in liquid medium, place a drop of liquid containing the specimen)

Step 2 of wet mount slide 

Place one edge of coverslip against slide @ 45 degree angle →

slide it toward drop of water so coverslip touches liquid on slide

Final step of wet mount slide preparation

Lower coverslip gently → slide

(prevents production of air droplets under cover slip)