Homework answers / question archive / Life University - BIO 112 LAB 4 PROTISTS 1)Which of the following correctly describes protists as a whole? A

Life University - BIO 112 LAB 4 PROTISTS 1)Which of the following correctly describes protists as a whole? A

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Life University - BIO 112

LAB 4 PROTISTS

1)Which of the following correctly describes protists as a whole?

A.            Each species only remains a protist for a short period of time until it evolves to form amulticellular organism.

B.            Protists are all closely related to each other and form one unified group.

C.            Protists are not closely related to each other; they are superficially similar in that they are unicellular and aquatic.

D.            Protists form two supergroups; the members of a single supergroup are closely related to each other, but not to the members of the other supergroup.

 

2.            Mixotrophic organisms like euglena and chlorarachniophytes are photosynthetic but...

A.            they prey on bacteria in order to get protein to supplement the carbohydrates they produce by photosynthesis.

B.            their photosynthetic pigments can only process red and orange light.

C.            they often loose their symbiotic relationship with algae and need to becomeheterotrophs.

D.            they will eat other unicellular organisms or dead organic matter when there is not enough sunlight for photosynthesis.

 

3.            Which protists are the most abundant marine photosynthetic producers?

A.            chlorarachniophytes and chromalveolates

B. diatoms and dinoflagellates

C. euglena

D. green, red, and brown algae

 

4.            To explain the difference between the green structures in the Stentor and the green structures in the diatoms (pictured below), select the answer choice that correctly fills in the blanks: The green dots in the Stentor are algae,    that the Stentor swallowed. The green dots in the diatoms are chloroplasts,        that evolved from endosymbiosis

A.            independent organisms, organelles

B.            eukaryotes, protists

C.            food, live bacteria

D.            multicellulars, colonies

 

5.            Choose the statement that explains the difference between the diatom colony and the more advanced spirogyra.

A.            The diatoms are only photosynthetic thanks to symbiotic algae. The spirogyra have their own chloroplasts.

B.            The diatoms do not have any specialized structures. The spirogyra have specialized structures, like holdfasts and leaves.

C.            The diatom cells are not interconnected and are very similar to diatoms that are living unicellularly. The spirogyra cells are the building blocks of the filaments.

D.            The diatoms are protected by cellulose cell walls. The spirogyra are protected by silicate shells that could link together to form several larger structures.

 

6.            In the following list, which organisms are NOT correctly matched to their mode oflocomotion?

A. volvox: pseudopods

B.            paramecium: cilia

C.            euglena: flagella

 

D.            diatoms: mucus swelling

 

7.            Which of the following is NOT true about euglena's pellicle?

A.            It protects the euglena.

B.            Although it is flexible enough that it can contract and expand its width while swimming, it cannot extend pseudopods like the amoeba.

C.            It is so durable that most protist fossils are fossilized euglena's pellicles.

D.            It is able to open a breach in itself to allow food to enter.

 

8.            What is unique about the highlighted structure in the paramecium in the picture Below

A.            The paramecium has one of the few subcellular structures specialized for defense.Trichocyst darts are ejected from that grove. Most other protists only have shells forprotection, if that.

B.            The paramecium ejects its second nucleus through the highlighted nuclear grove duringreproduction.

C.            The paramecium ejects excess water through the contractile grove, allowing parameciumto live in fresher water than other protists.

D.            The paramecium has one of the few subcellular structures specialized for absorbingfood; most protists engulf food with all regions of the cell.

 

9.            What is the difference between Stentor 1 and Stentor 2 in the picture below?←← A.Stentor 1's symbiotic partner is red algae; Stentor 2' symbiotic partner is green algae.

B. The colonial cells in Stentor 1 are arranged in rows; in Stentor 2, the colonial cells are spotted.

C. Stentor 1 is swimming freely; Stentor 2 is fixed to a surface.

D. Stentor 1 is multicellular; Stentor 2 is colonial.

 

 

 

 

10.          What is highlighted in the Volvox image below?

A.            individual Volvox cells that are interconnected by cytoplasmic filaments

B.            symbiotic algae that provide the Volvox with carbohydrates for energy and live off theVolvox's waste products

C.            daughter colonies growing inside the mother colony until they are ready to break out ontheir own

D.            eyespots that allow the Volvox colony to swim towards the light

 

11.          Only red algae can grow in relatively deep regions of the ocean because red algae are:

A.            capable of absorbing carbon dioxide even from the carbon dioxide depleted deep watersand using the carbon dioxide to build sugars during photosynthesis.

B.            capable of absorbing ultraviolet light for photosynthesis, rather than visible light

C.            able to perform chemosynthesis, rather than photosynthesis.

D.            specialized for absorbing longer wavelengths of light that penetrate deeper into the water for photosynthesis.

 

12.          Why are seaweeds not considered "true plants"?

A.            They are only capable of living in the water and cannot make the transition to life onland.

B. They lack a specialized vascular system, roots, stems, or leaves.

C. They use other photosynthetic pigments besides for chlorophyll.

D. All of the answer choices are reasons why seaweeds are not considered "true plants".

 

 

13.          In the image below, which characteristics allow you to identify it as an ameoba's pseudopods?

A.            The lack of a girdle to store the pseudopods is characteristic of an ameoba's pseudopods.

B.            There are only a few pseudopods, not the vast array of the foram, and the pseudopodsare flat.

C.            The gray outline around the pseudopods is typical of the secretion of mucuscharacteristic of an ameoba's pseudopods.

D.            The green chloroplasts allow you to identify it as an endosymbiotic amoeba and not aheterotrophic entamoeba.

 

14.          What happens to the amoeba's cytoplasm as it moves?

A.            It is pushed out into the pseudopods. This can be seen through the movement of smallgranules in the cytoplasm flowing into the pseudopods.

B.            It stays in place; the pseudopods are rigid structures that are extended from the cellbody.

C.            The cytoplasm expands and contracts as the amoeba flexes the entire cell to propel itselfforward.

D.            The amoeba jettisons excess cytoplasm as it moves, making itself lighter to float to thesurface of the ocean.

 

15.          In the image of Choanoflagellates below, what is the function of the highlightedstructure?

 

A.beat and propel the Choanoflagellates forward

 B.aid in the digestion of food

C.help the Choanoflagellates float in a higher level of the ocean so the Choanoflagellates receive enough light to perform photosynthesis

D. excrete carbon dioxide and other waste