You Are Given Five Test Tubes, Each Containing an Unknown

question 11

Multiple Choice

You are given five test tubes, each containing an unknown protist, and your task is to read the following description and match these five protists to the correct test tube.
In test tube 1, you observe an organism feeding. Your sketch of the organism looks very similar to Figure 28.1. When light, especially red and blue light, is shone on the tubes, oxygen bubbles accumulate on the inside of test tubes 2 and 3. Chemical analysis of test tube 3 indicates the presence of substantial amounts of silica. Chemical analysis of test tube 2 indicates the presence of a chemical that is toxic to fish and humans. Microscopic analysis of organisms in test tubes 2, 4, and 5 reveals the presence of permanent, membrane-bounded sacs just under the plasma membrane. Microscopic analysis of organisms in test tube 4 reveals the presence of an apicoplast in each. Microscopic analysis of the contents in test tube 5 reveals the presence of one large nucleus and several small nuclei in each organism.

Figure 28.1
-Test tube 4 contains

• A) Paramecium.
• B) Navicula (diatom).
• C) Pfiesteria (dinoflagellate).
• D) Entamoeba.
• E) Plasmodium.

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Definitions:

Flat Tapers

Tapering geometry where the taper is flat, usually referring to a gradual decrease in thickness or diameter over the length of an object.

Cutting Plane

An imaginary plane where an object is assumed to be cut through to produce sectional views for technical drawings.

Theoretical

Pertains to concepts or ideas existing in theory and not necessarily by practice or actual implementation.

Countersink

A method to create a conical hole matching the angled shape of a countersink screw, allowing the head to sit flush with or below the surface of the material.