1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
iris [78.8K]
3 years ago
9

Help me describe how these protists feed, move, and reproduce.

Biology
1 answer:
NARA [144]3 years ago
7 0

Explanation:

Protists are mostly one-celled organisms. Some make

their own food, but most take in or absorb food. Most

protists move with the help of flagella, pseudopods, or

cilia. Some protists, like the one-celled amoeba and paramecium, feed on other

organisms.

Fungus-like protists share many features with fungi. Like fungi, they are heterotrophs, meaning they must obtain food outside themselves. They also have cell walls and reproduce by forming spores.

Ciliates reproduce asexually by division: the micronucleus undergoes mitosis, while in most ciliates the macronucleus simply pinches apart into two. This process is shown in the drawing above. However, ciliates also reproduce sexually, through a process known as conjugation. Conjugation is often induced by lack of food. Two ciliates of opposite mating types come close together and form a cytoplasmic bridge between the two cells; the micromuclei divide by meiosis, the macronuclei disintegrate, and the conjugating cells exchange haploid micronuclei over the cytoplasmic connection. They then separate, reform new macronuclei from their micronuclei, and divide, but remember that the essence of sexual reproduction is forming a new organism from the combined genetic material of parents. After conjugation, each ciliate partner has acquired new genetic material, and divides to give rise to progeny with a new combination of genes. This is essential to the survival of ciliate lineages; most ciliates cannot reproduce indefinitely by asexual fission, and eventually die out if prohibited from conjugating.

One convenient way to categorize protozoans is by how they move. Some move rapidly, while others creep slowly. Still others are not capable of active movement at all, but instead rely on a host organism to supply their food.

Protozoans With Flagella

Zooflagellates (zoh oh FLAJ uh lits) move by means of one or more flagella. (Recall from Chapter 6 that flagella are long, thin, whip-like cellular projections.) Zooflagellates generally reproduce asexually by binary fission. Recall that asexual reproduction results in genetically identical offspring.

Sarcodines reproduce sexually by syngamy (fusion of two gametes) and asexually by division or budding. In multinucleate forms, cytoplasmic division with distribution of the nuclei occurs.Members of the phylum Sarcodina are ameboid. They move about by using pseudopods and usually eat by phagocytosing food particles, usually bacteria. Some amoeba form calcium carbonate or silica skeletons called tests to protect themselves.

The sporozoans are able to form spore-like cells, from which they get their name. Sporozoans do not have flagella, cilia, or pseudopodia. They are capable of gliding movements. ... The apical complex secretes enzymes which allow the sporozoan to enter a host cell.Apicomplexan, also called sporozoan, any protozoan of the (typically) spore-producing phylum Apicomplexa, which is called by some authorities Sporozoa. ... Apicomplexans feed by absorbing either dissolved food ingested by the host (saprozoic nutrition) or the host's cytoplasm and body fluids.Protozoa reproduce asexually by fission, schizogony, or budding. Some protozoa can also reproduce sexually. Relatively few protozoa cause disease

You might be interested in
Which scientist would agree with this statement: Giraffes all had short necks originally. Individual giraffes stretched their ne
anyanavicka [17]

Answer:

Jean-Baptiste de Lamarck

Explanation:

His two principles were "use and disuse" and "inheritance of acquired characteristics." The latter is what the statement is referring to.

6 0
3 years ago
Read 2 more answers
The movement of which kind of molecules is controlled by osmosis? lipid protein water salt
ycow [4]
Water.
Osmosis is the movement of water.

Hope this helps!
6 0
3 years ago
Read 2 more answers
H
vazorg [7]

Answer:

I don't know the question u are trying to say

7 0
3 years ago
How was the Earth different 4.6 billion years ago than it is today
vfiekz [6]
The geological features were different. And humans development was different.
8 0
3 years ago
What is a climber organism​
fgiga [73]

Answer: epiphyte organsim

Explanation:

4 0
2 years ago
Other questions:
  • Which is not an example of someone maintaining homeostasis
    15·2 answers
  • DNA encodes the cell's genetic instructions for making proteins. The process of making proteins from DNA is divided into two sta
    11·1 answer
  • What are some viable ways of lessening the effect that increased carbon has on the following?
    6·1 answer
  • Natural systems (respiring animals, decomposition, fires, the ocean) contribute approximately 700 giga-tons of Carbon (GtC) to t
    15·1 answer
  • Acetyl-CoA can be generated by which three metabolic pathways for potential use by the Citric Acid Cycle for energy metabolism?
    13·1 answer
  • The Evolutionary Arms race:
    8·1 answer
  • Pls help pls pls pls​
    9·1 answer
  • What is the formula for 1 molecule of water
    14·2 answers
  • Based on your understanding of nucleic acids, what type of bonds form between the CRISPR/guide RNA molecule and the target DNA
    12·1 answer
  • during the process of cellular respiration, energy is released from(1)Carbon dioxide (2) Oxygen atoms(3)Water molecules (4) chem
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!