Lab 2 - Microbes I: Bacterial Colonies & Protists

25 important questions on Lab 2 - Microbes I: Bacterial Colonies & Protists

How do Amoeba consume their food?

Amoeba consume their food via phagocytosis.

What is the name of the granular material that is observed flowing inside the cell of an Amoeba?

The name of the granular material is the endoplasm.

What is the blade in the Laminaria?

The blade is the leaf-like structure of Laminaria, which performs photosynthesis and provides support.
  • Photosynthesis process
  • Support function
  • Leaf-like appearance
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What is the stipe in the Laminaria?

The stem-like structure

How does flexible movement observed in the live culture of Protists ocur?

The movement occurs via the contraction and strokes of flagella and pellicle.

What is the difference between diatoms and diatomaceous earth according to the highlighted text?

Diatoms are living organisms while diatomaceous earth are massive accumulations of fossilized diatom walls.

What is the function of the macronucleus and the micronucleus?

The macronucleus carries out functions in the organism, and the micronucleus carries the genetic information for reproduction.

Why are Paramecium heterotrophic?

These organisms are heterotrophic because they have a food vacuole but no chloroplast and therefore cannot make their own food.

Why are Amoeba heterotrophic?

These are heterotrophic organisms because they don't have chloroplasts. As well, they have food vacuoles.

What is Trypanosoma lewisi characterized as?

Trypanosoma lewisi is one euglenozoan that is also characterized as a kinetoplastid because of the unique structure of its mitochondria.

Why are Euglena considered mixotrophic?

These organisms are mixotrophic because they have both chloroplasts and a food vacuole

What do colonies of bacteria contain that are not visible to the naked eye?

Colonies of bacteria contain millions of individual cells that are not visible to the naked eye.

What is a pellicle in Euglena?

A pellicle is a specialized membrane that has strong bands of protein to enable flexible movement and engulfment of food.

Where are bacteria often grown in the lab?

In the lab, bacteria are often grown on agar plates which contain the different nutrients, salts, or sugars that each species needs in order to metabolize.

How do heterotroph protists derive their food?

Protists are heterotrophs, deriving their food from outside sources including absorption and ingestion of particles based on size.

What is the most commonly used agar in the lab?

The most commonly used agar is Nutrient Agar (NA) which contains peptone (a source of nitrogen), beef and yeast extract (provides vitamins and carbohydrates), agar and salts.

What do brown algae exhibit?

The brown algae exhibit an alternation of generations.

Why are protists considered eukaryotes?

Protists are eukaryotes, along with plants, animals, and fungi, since they have a membrane-bound nucleus and a variety of organelles.

What are alveoli in Alveolates?

Alveoli are flattened sacs near the cell membrane that provide structural support.

What is Archeplastida characterized by?

Organisms in this grouping are characterized by having a primary plastid which is derived from cyanobacteria through the process of endosymbiosis.

What does the SAR clade include?

The Stramenopiles, the Rhisarians, and the Alveolates

What are the four main "supergroups" of protists?

The four main "supergroups" of protists are the Excavata, the SAR clade, the Archaeplastida, and the Unikonta.

Where do protists live?

Protists live in a wide range of water habitats, including puddles, ponds, lakes, and oceans

What is the holdfast in a Laminaria?

The structure that anchors the plant into the ground

What is the movement like in a live culture of Protists?

It is fast and in a random direction

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