Are protozoans presenting contractile, or pulsatile, vacuoles easily found in fresh or in salt water?

Are protozoans presenting contractile, or pulsatile, vacuoles easily found in fresh or in salt water?
by

1 Answer

Answer :

Fresh water is the less concentrated of solutes than sea water and it (fresh water) tends to be less concentrated than the intracellular environment making cells to swell. Sea water, on the other hand, since it is very concentrated tends to dehydrate the cell. The vacuoles of protozoans are internal structures specialized in water storage that when necessary liberate water to the cytoplasm. Vacuoles thus can dilute the cytoplasm for it to enter into osmotic equilibrium with the environment. Protozoans of fresh water then need vacuoles more since their intracellular is hypertonic in relation to the exterior. Without the dilution mechanism provided by the vacuoles, protozoans of fresh water would absorb too much water and would die.
by
selected by

Related questions

Ciliates differ from all other protozoans in (a) using flagella for locomotion (b) having a contractile vacuole for removing excess water (c) using pseudopodia for capturing prey (d) having two types of nucle

Description : Ciliates differ from all other protozoans in (a) using flagella for locomotion (b) having a contractile vacuole for removing excess water (c) using pseudopodia for capturing prey (d) having two types of nucle

Last Answer : d) having two types of nuclei.

Ciliates differ from all other protozoans in (1) using flagella for locomotion (2) having a contractile vacuole for removing excess water (3) using pseudopodia for capturing prey (4) having two types of nuclei

Description : Ciliates differ from all other protozoans in (1) using flagella for locomotion (2) having a contractile vacuole for removing excess water (3) using pseudopodia for capturing prey (4) having two types of nuclei

Last Answer : (4) having two types of nuclei

Contractile vacuoles of Paramecium are analogous to

Description : Contractile vacuoles of Paramecium are analogous to

Last Answer : Contractile vacuoles of Paramecium are analogous to A. Sweat glands of mammals B. Uriniferous tubules ... cavity of Hydra D. Typhlosole of Earthworm

Why contractile vacuoles would be of little value to one cell organisms living in the ocean?

Description : Why contractile vacuoles would be of little value to one cell organisms living in the ocean?

Last Answer : I do get it,for the organism living in the hypertonic saltwater(ocean) the contractile vacuole is most not needed since thewater in the organism are already on thier way out!

In most species of Paramecium there are how many contractile vacuoles? Is it: a) one b) two c) three d) four

Description : In most species of Paramecium there are how many contractile vacuoles? Is it: a) one b) two c) three d) four

Last Answer : ANSWER: B -- Two

Uricotelism is found in (a) mammals and birds (b) fish and fresh water protozoans (c) birds, land reptiles and insects (d) frogs and toads.

Description : Uricotelism is found in (a) mammals and birds (b) fish and fresh water protozoans (c) birds, land reptiles and insects (d) frogs and toads.

Last Answer : (c) birds, land reptiles and insects

Anyone with Pulsatile Tinnitus and have you handled it with medication?

Description : Anyone with Pulsatile Tinnitus and have you handled it with medication?

Last Answer : I had it for years- the pulsing drove me crazy. I had a genioplasty in s Africa about a year and a half ago now I don’t have the pulsing which for me was the worst part. I just live with the rest. I’ve been préscribed neuro medications but I don’t take them.

Water soluble pigments found in plant cell vacuoles are (a) carotenoids (b) anthocyanins (c) xanthophylls (d) chlorophylls.

Description : Water soluble pigments found in plant cell vacuoles are (a) carotenoids (b) anthocyanins (c) xanthophylls (d) chlorophylls.

Last Answer : (b) anthocyanins

What are contractile proteins found in what?

Description : What are contractile proteins found in what?

Last Answer : Muscles

In cell, digestive enzymes are found mainly in (A) Vacuoles (B) Lysosomes (C) Ribosomes (D) Lomasomes

Description : In cell, digestive enzymes are found mainly in (A) Vacuoles (B) Lysosomes (C) Ribosomes (D) Lomasomes

Last Answer : Answer : B

Which one of the following is NOT found in the ciliates? a. A contractile vacuoLe b. Macronuclei and micronucLei c. A compLex of organelles in the tip d. Mitochondria

Description : Which one of the following is NOT found in the ciliates? a. A contractile vacuoLe b. Macronuclei and micronucLei c. A compLex of organelles in the tip d. Mitochondria

Last Answer : d. Mitochondria

Performs and granzymes are found in a. Helper T cells. b. Antigen-presenting cells. c. Cytotoxic T cells. d. B cells.

Description : Performs and granzymes are found in a. Helper T cells. b. Antigen-presenting cells. c. Cytotoxic T cells. d. B cells.

Last Answer : c. Cytotoxic T cells.

Protozoans ingest food through?

Description : Protozoans ingest food through?

Last Answer : cytostome

What Protozoans have been traditionally grouped according to their?

Description : What Protozoans have been traditionally grouped according to their?

Last Answer : What is the answer ?

How are protozoans differentiated by means of their locomotory organelles?

Description : How are protozoans differentiated by means of their locomotory organelles?

Last Answer : Need answer

What are the four groups of protozoans?

Description : What are the four groups of protozoans?

Last Answer : The four main groups of protozoans are the sarcodines (that form pseudopods, like amoebae), the mastigophores (flagellated, like the trypanosome that causes Chagas' disease), the ... forming, like plasmodia). Protists Review - Image Diversity: sarcodines mastigophores ciliated protozoans sporozoans

Do protozoans have sexual or asexual reproduction?

Description : Do protozoans have sexual or asexual reproduction?

Last Answer : In protozoans reproduction is sexual or asexual. The most frequent form of sexual reproduction is binary division, or scissiparity, in which the cell divides itself by mitosis originating two ... mosquito, the definitive host, and the zygote undergoes mitosis (sporogony) creating many sporozoites.

How is digestion performed in protozoans?

Description : How is digestion performed in protozoans?

Last Answer : Digestion in protozoans is intracellular digestion: organic material is internalized and degraded inside the cell. Protozoans get food by phagocytosis and then the food is digested when phagosomes fuse ... at specialized regions of the plasma membrane, the cytostom and the cytopyge, respectively.

What do protozoans “eat”? Do they move in search for food?

Description : What do protozoans “eat”? Do they move in search for food?

Last Answer : Protozoans are heterotroph beings, i.e., they do not make their own food and thus they need to search for it in the environment. Protozans have developed several locomotion mechanisms and they actively move towards food.

Do protozoans have a cellular nucleus?

Description : Do protozoans have a cellular nucleus?

Last Answer : All protozoans, as eukaryotes, have nucleus. Some species, like the paramecium, have two nuclei: the macronucleus and the micronucleus. Protists Review - Image Diversity: paramecium

What are the characteristics of protozoans that make them resemble animals?

Description : What are the characteristics of protozoans that make them resemble animals?

Last Answer : Protozoans are unicellular beings with some similar characteristics to animal cells. In comparison to pluricellular organisms protozoans are more proximal to the animal kingdom than to plants: ... The evolutionary hypothesis that animal cells have come from differentiation of protozoans is strong.

What is the fundamental difference between protozoans and algae?

Description : What is the fundamental difference between protozoans and algae?

Last Answer : The basic difference between protozoans and algae is the fact that protozoans are heterotrophs while algae are photosynthetic autotrophs.

Why Amoeba and other protozoans do not have proper respiratory system?

Description : Why Amoeba and other protozoans do not have proper respiratory system? 

Last Answer : In small aquatic animals (unicellular) oxygen from water diffuses directly into the cell surface. This is the simplest way of respiration therefore they do not have proper respiratory system.  

During the formation of bread it becomes porous due to release of CO2 by the action of (a) yeast (b) bacteria (c) virus (d) protozoans.

Description : During the formation of bread it becomes porous due to release of CO2 by the action of (a) yeast (b) bacteria (c) virus (d) protozoans.

Last Answer : (a) yeast

acob and Monod studied lactose metabolism in E. coli and proposed operon concept. Operon concept is applicable for (a) all prokaryotes (b) all prokaryotes and some eukaryotes (c) all prokaryotes and all eukaryotes (d) all prokaryotes and some protozoans

Description : acob and Monod studied lactose metabolism in E. coli and proposed operon concept. Operon concept is applicable for (a) all prokaryotes (b) all prokaryotes and some eukaryotes (c) all prokaryotes and all eukaryotes (d) all prokaryotes and some protozoans

Last Answer : (c) all prokaryotes and all eukaryotes

Protozoans living within the digestive tract of a termite and digesting the cellulose the termite takes in is an example what?

Description : Protozoans living within the digestive tract of a termite and digesting the cellulose the termite takes in is an example what?

Last Answer : ANSWER: MUTUALISM

Photographic plates are covered with black paper because (a) the cellulose acetate of the paper must remain fresh (b) sunlight is easily absorbed by black paper and it helps develop the film (c) the silver bromide present on the plate is very sensitive to light and black paper prevents contact with light (d) the conversion of silver bromide to metallic silver is essential

Description : Photographic plates are covered with black paper because (a) the cellulose acetate of the paper must remain fresh (b) sunlight is easily absorbed by black paper and it helps develop the film ... paper prevents contact with light (d) the conversion of silver bromide to metallic silver is essential

Last Answer : Ans:(c)

The osmotic expansion of a cell kept in water is chiefly regulated by (a) mitochondria (b) vacuoles (c) plastids (d) ribosomes.

Description : The osmotic expansion of a cell kept in water is chiefly regulated by (a) mitochondria (b) vacuoles (c) plastids (d) ribosomes.

Last Answer : (b) vacuoles

What are gas vacuoles? -Biology

Description : What are gas vacuoles? -Biology

Last Answer : Gas vacuoles are air-filled, cylindrical compartments present in prokaryotes. They help in the buoyancy. Gas vacuoles are found in many aquatic bacteria such as blue-green algae or cyanobacteria, halophilic ... .g. Halobacterium, a halophile, has gas vesicles, which help them float in salt water.

What are the functions of gas vacuoles? -Biology

Description : What are the functions of gas vacuoles? -Biology

Last Answer : Gas vacuoles help bacteria in buoyancy and enable them to float at the desired depth. They do so by inflating and deflating the vesicles. Main functions include:They help the photosynthetic bacteria in ... E.g. Halobacterium, a halophile, has gas vesicles, which help them float in salt water.

Which is responsible for initiating and maintining the rhythmic contractile activity of the heart ?

Description : Which is responsible for initiating and maintining the rhythmic contractile activity of the heart ?

Last Answer : Which is responsible for initiating and maintining the rhythmic contractile activity of the heart ? A. Sino- ... ) C. Purkinje fibres D. Bundle of his

$ Amoeba is a type of sporozoan. ! Sporozonas have two contractile vacules.

Description : $ Amoeba is a type of sporozoan. ! Sporozonas have two contractile vacules.

Last Answer : $ Amoeba is a type of sporozoan. ! Sporozonas have two contractile vacules. A. If both As and R are ... is wrong D. If both As and R are wrong.

$ Vacuoles help in compartmentisation inside a cell. ! A eukaryotic flagellum is formed of a protein called flagellin.

Description : $ Vacuoles help in compartmentisation inside a cell. ! A eukaryotic flagellum is formed of a protein called flagellin.

Last Answer : $ Vacuoles help in compartmentisation inside a cell. ! A eukaryotic flagellum is formed of a protein called ... wrong D. If both As and R are wrong.

$ Rhodopsin of rod cells and iodospin of cone cells of retina are proteins ! Myosine and Actin are contractile proteins

Description : $ Rhodopsin of rod cells and iodospin of cone cells of retina are proteins ! Myosine and Actin are contractile proteins

Last Answer : $ Rhodopsin of rod cells and iodospin of cone cells of retina are proteins ! Myosine and Actin are ... wrong D. If both As and R are wrong.

The functional unit of the contractile system in the striped muscle is_____

Description : The functional unit of the contractile system in the striped muscle is_____

Last Answer : The functional unit of the contractile system in the striped muscle is_____

A contractile mid body forms during cytokinesis in :-

Description : A contractile mid body forms during cytokinesis in :-

Last Answer : A contractile mid body forms during cytokinesis in :- A. Animals B. Higher plants C. Fungi D. Algae

Assertion:- Vacuoles are osmoregulatory components of cell. Reason:- lons and other materials are stored in vacuole.

Description : Assertion:- Vacuoles are osmoregulatory components of cell. Reason:- lons and other materials are stored in vacuole.

Last Answer : Assertion:- Vacuoles are osmoregulatory components of cell. Reason:- lons and other materials are stored ... D. If both Assertion & Reason are false.

The contractile unit of muscle is a part of myofibril be- tween

Description : The contractile unit of muscle is a part of myofibril be- tween

Last Answer : The contractile unit of muscle is a part of myofibril be- tween A. Z line and I band B. Z line and Z line C. Z line and A band D. A band and I band

Mammalian kidney resemble contractile vacuole of Amoeba in excretion of

Description : Mammalian kidney resemble contractile vacuole of Amoeba in excretion of

Last Answer : Mammalian kidney resemble contractile vacuole of Amoeba in excretion of A. Glucose B. Excess water C. Urea D. Ammoriia

What forms food vacuoles to digest food particles?

Description : What forms food vacuoles to digest food particles?

Last Answer : What is the answer ?

What are two facts about vacuoles?

Description : What are two facts about vacuoles?

Last Answer : Vacuoles are both in plant and animal cell. It stores water,food and wastes. It has no proper shape.

Cells contain smaller parts known as organelles. The nucleus, chloroplasts, mitochondria, and vacuoles are all examples of organelles. What do these organelles have in common?

Description : Cells contain smaller parts known as organelles. The nucleus, chloroplasts, mitochondria, and vacuoles are all examples of organelles. What do these organelles have in common?

Last Answer : They are all enclosed by a membrane.

The material contained in vacuoles

Description : The material contained in vacuoles

Last Answer : Ans. Cell sap

Which of the following statement(s) is/are correct concerning the cardiovascular response to shock? a. Changes in cardiac contractile function shift the Frank Starling curve up and down b. Venoconstriction from skeletal muscle is a significant contributor to the restoration of blood volume with shock c. Arterial vasoconstriction affects all vascular beds equally d. The total circulating blood volume is equally split between the arterial and venous system

Description : Which of the following statement(s) is/are correct concerning the cardiovascular response to shock? a. Changes in cardiac contractile function shift the Frank Starling curve up and down b. ... d. The total circulating blood volume is equally split between the arterial and venous system

Last Answer : Answer: a Central in the general cardiovascular response to shock is the action of the heart itself. The principle determinants of cardiac function in the normal heart are the volume of blood ... Blood flow to the skin is sacrificed early, followed by that to the kidneys and splanchnic viscera

What are plant cell vacuoles ?

Description : What are plant cell vacuoles ?

Last Answer : What are their functions? How is the covering membrane of the vacuoles called? Plant cell vacuoles are cell structures delimited by membranes within which there is an aqueous solution made of ... delimits the vacuoles is called tonoplast, named after the osmotic function of the structure.

Which among the following parts of a plant is involved in gaseous exchange? (1) Stomata (2) Lenticels (3) Vacuoles (4) Stomata & Lenticels

Description : Which among the following parts of a plant is involved in gaseous exchange? (1) Stomata (2) Lenticels (3) Vacuoles (4) Stomata & Lenticels

Last Answer : (4) Stomata & Lenticels Explanation: Plants obtain the gasesthey need through their leaves. They require oxygen for respiration and carbon dioxide for photosynthesis.

The contractile proteins in a muscle are (1) Actin and Myosin (2) Actin and Tropomyosin (3) Myosin and Troponin (4)Troponin and Tropomyosin

Description : The contractile proteins in a muscle are (1) Actin and Myosin (2) Actin and Tropomyosin (3) Myosin and Troponin (4)Troponin and Tropomyosin

Last Answer : (1) Actin and Myosin Explanation: Muscle fibers or myofibrils are formed of three types of proteins which are (1) contractile, (2) regulatory, and (3) structural. Contractile proteins are the force ... are Actin which is part of thin filament and Myosin, which is part of the thick filament.

ATP is generated in C A. Lysosomes B. Food Vacuoles C. Mitochondria D. Golgi apparatus

Description : ATP is generated in C A. Lysosomes B. Food Vacuoles C. Mitochondria D. Golgi apparatus

Last Answer : Mitochondria

The part of the cell which binds to the mRNA during protein systhesis is C A. Golgi bodies B. Lysosomes C. Ribosomes D. Food vacuoles

Description : The part of the cell which binds to the mRNA during protein systhesis is C A. Golgi bodies B. Lysosomes C. Ribosomes D. Food vacuoles

Last Answer : Ribosome

ATP is generated in C A. Lysosomes B. Food Vacuoles C. Mitochondria D. Golgi apparatus

Description : ATP is generated in C A. Lysosomes B. Food Vacuoles C. Mitochondria D. Golgi apparatus

Last Answer : Mitochondria