Question

~!FREE 5 POINTS + HELP ON 2.6.7: PROTISTS!~

Answer 1

Answer:

All of them are correct, I just provided explanations.

Explanation:

1. B is correct. Protists more closely resemble members of other eukaryotic kingdoms than they do other protists. Biologists used to classify all protists as part of Kingdom Protista, but almost every rule used to describe them has some major exception. They are now attempting to revise the classification of the organisms in this kingdom. Some scientists have tried to sort protists in comparison to three of the other kingdoms: plant, animal and fungus. This has not worked because many protists exhibit characteristics from two or more of these kingdoms. The current attempts of classification focus on grouping protists into between three and ten kingdoms, based on species’ common evolutionary ancestors. So, yes, B is correct.

2. C is correct. Rhodophyta, or red algae. This is because, apart from their ability to capture light energy and fix CO2, they lack many structural and biochemical traits that distinguish plants from protists. So, yes, C is correct.

3. B is correct. A boat is moved forward by a current. Non-motile protists rely on another organism to transport them, they may also rely of forces such as water or wind.

4. A is correct. The micronucleus. Paramecia Asexual Reproduction: 1. Conjugating begins when two paramecia attach to each other, 2. Meiosis of their diploid micronuclei produces four haploid micronuclei 3. In each cell three haploid micronuclei disintegrate, 4. The remaining micronuclei in each cell divides by mitosis, 5. The two cells engaged one haploid micronuclei from each other, 6. In each cell the micronuclei fuse to form a single diploid micronuclei and the macronuclei disintegrate, 7. Each cell forms a new macronucleus from its micronucleus. So, yes, A is correct.

5. A is correct. Alternation of generations. Haploid- term used to refer to a cell that contains only a single set of genes; represents meiosis

Diploid- term used to refer to a cell that contains two sets of homologous chromosomes; represents fertilization. Some protists reproduce asexually by mitosis, others have a life cycle that combine asexual and sexual form of reproduction. Alternation of generations is a reproductive cycle of plants, fungi, and some protists in which a sexual reproductive phase alternates with an asexual reproductive phase. So, yes, A is correct.

6. A is correct. They are eaten by some whales. Fish get sustenance from the organisms that have fed on the phytoplankton, including baleen whales, which strain the plankton out of the water and into their mouths. Then phytoplankton get nutrients from the feces of whales, helping keep the carbon cycle of the ocean in check. So, yes, A is correct.

7. A is correct. Nitrogen-rich fertilizer washes off of fields into the ocean. Some algal blooms are the result of an excess of nutrients (particularly phosphorus and nitrogen) into waters and higher concentrations of these nutrients in water cause increased growth of algae and green plants. So, yes, A is correct.

8. A is correct. Plasmodia. Most of the life of a slime mold is spent as a microscopic amoeba that roams by itself. It moves around, feeding on organic matter like bacteria and other microscopic particles. During food shortages, plasmodial slime molds swarm and merge together into a large, multinucleated single cell called a plasmodium. The plasmodium has thousands of nuclei and does not contain a cell wall. One variety of plasmodial slime molds is often seen as a slimy, yellow network in and on rotting logs, as shown in Figure below. Cellular slime molds live as individual cells and come together in times of food shortage to form a reproductive structure called a fruiting body. So, yes, A is correct. Fun fact: Mushrooms are also fruiting bodies.

9. D is correct. Sweeping food particles into their gullet. Sexual process in which two lower organisms of the same species, such as bacteria, protozoans, and some algae and fungi, exchange nuclear material during a temporary union ( ciliated protozoans), completely transfer one organism's contents to the other organism. So, yes, D is correct.

10. B is correct. Walter molds. Water molds and other protists reproduce asexually by producing spores in a structure called a sporangium. They are filamentous protists which must absorb their food from the surrounding water or soil, or may invade the body of another organism to feed. So, yes, B is correct.

Answer 2

Answer:

1 - What is one reason why the classification of protists in one kingdom is difficult?

Incorrect A. Some protists are unicellular while other protists are multicellular.

CORRECT B. Protists more closely resemble members of other eukaryotic kingdoms than they do other protists.

incorrect C. Protists may be funguslike, plantlike, or animal-like, but they do not have characteristics of more than one of these groups.

Incorrect D. Because they are unicellular, protists fit better in the two domains of prokaryotes.

2 -

Figure 21-1

Based on Figure 21-1, which of the major groups of protists is MOST closely related to plants?

Incorrect answer A. Amoebozoa

Incorrect answer B. Excavates

CORRECT C. Rhodophyta

Incorrect answer D. Choanozoa

3 - Which of the following analogies best describes the motion of a nonmotile protist?

Incorrect answer A. A boat is moved forward by several oars.

CORRECT B. A boat is moved forward by a current.

Incorrect answer C. A boat is moved forward by a single long oar.

Incorrect answer D. A boat is moved forward by a motor.

4 - Which structure of a paramecium holds a “reserve copy” of all the cell’s genes?

CORRECT A. the micronucleus

Incorrect answer B. the zygote

Incorrect answer C. the sporangium

Incorrect answer D. the macronucleus

5 - Many protists alternate between diploid and haploid stages during their life cycle in a process known as

CORRECT A. alternation of generations.

Incorrect answer B. conjugation.

Incorrect answer C. sexual reproduction.

Incorrect answer D. asexual reproduction.

6 - How are phytoplankton important to whales?

CORRECT A. They are eaten by some whales.

Incorrect answer B. They provide calcium carbonate for whales.

Incorrect answer C. They provide the whales with shelter.

Incorrect answer D. They recycle wastes into materials whales can eat.

7 - Which of the following events might lead to an algal bloom?

CORRECT A. Nitrogen-rich fertilizer washes off of fields into the ocean.

Incorrect answer B. Oxygen is removed from ocean water by decomposition.

Incorrect answer C. New sewage plants remove more wastes from discharge.

Incorrect answer D. The population of baleen whales increases.

8 - When the amoebas of slime molds join, they form structures with many nuclei called

CORRECT A. plasmodia.

Incorrect answer B. sporangia.

Incorrect answer C. spores.

Incorrect answer D. zygotes.

9 - Ciliates get food by

Incorrect answer A. surrounding a cell or particle and taking it inside themselves.

Incorrect answer B. absorbing molecules from the environment through their cell membranes.

Incorrect answer C. forming a plasmodium in order to get food.

CORRECT D. sweeping food particles into their gullet.

10 - Which of the following protists gets nutrients mainly by absorbing molecules from other organisms through their cell walls and cell membranes?

Incorrect answer A. amoebas

CORRECT B. water molds

Incorrect answer C. ciliates

Incorrect answer D. slime molds​

Explanation: