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DIA [1.3K]
3 years ago
9

What structure keeps harmful chemicals out of animal cells?

Biology
1 answer:
Charra [1.4K]3 years ago
4 0

Cell membrane protects animals cells from harmful chemicals.

Explanation:

The cell membrane is a tough covering composed of the phospholipids and proteins and forms a bilayer around the cells. This acts as a semi-permeable membrane and controls the transport of ions, organic molecules and solutes to and from the cell through selective permeability.

The hydrophilic and hydrophobic properties and the corresponding polarity of the cell membrane and ionization status of the chemicals prevent the entry of harmful substances into the cell. The cell membrane functions as a barrier system and prevents the flow.

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What is free nitrogen?
UNO [17]

Answer:

Nitrogen thet cannot be used by organisms. C.

Explanation:

Free nitrogen is simply molecular nitrogen (N2). Nitrogen, in its molecular form, consists of two nitrogen atoms bound together with a tripple bond. Because it is very stable, N2 is typically nonreactive, and takes a lot of energy to break them apart. Among these are the amino acids necessary for life to begin and which are the building blocks DNA is made from. Basically, any nitrogen that is in an organic compound is considered “fixed” nitrogen and N2 is considered to be “free” nitrogen

5 0
3 years ago
Read 2 more answers
In a cell undergoing mitosis, chromatin fibers lengthen, the mitotic spindle is broken down, and nuclei start to
Leto [7]
Answer:
Cytokinesis
Explanation:
It is the first stage


8 0
2 years ago
I will mark as brainiest!
ArbitrLikvidat [17]

Answer:

Chromosome 17 is made of over   million (80) base pairs.

Approximately how many genes are found on chromosome 17?  

1600

Explanation:

took on edge2020 and got it right

hope this helps :)

6 0
3 years ago
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What are the three classes of bryophytes?
Margaret [11]

Answer:

Class I: Hepaticopsida ( Liverworts)

Class II: Anthocerotopsida ( Hornworts)

Class III: Bryopsida ( Mosses)

Explanation:

Bryophytes are small plants that grows in moist and shady places.They don't attain great heights because of absence of roots, vascular tissues, mechanical tissues and cuticle. They are terrestrial but require external water to complete their life cycle. Hence they are called as the" amphibians" of the animal kingdom.

Class I: Hepaticopsida or Hepaticae

  • Gametophytic plant body is either thalloid or foliose. If foliose the lateral appendages are  without midrib.
  • Rhizoids without septa
  • Each cell in the thallus contain many chloroplasts
  • Sex organs are embedded in the dorsal surface
  • Capsule lacks columella
  • Sporophyte may be simple having only one capsule or differentiated into root, seta and capsule
  • It has 4 orders: Calobryales, Jungermanniales, Spherocarpales and Marchantiales

Class 2: Anthocerotae or Anthocerotopsids:

  • Gametophytic plant body is simple, thalloid;thallus dorsiventra without air chambers shows no internal differentiation of tissues
  • Scales are absent in the thallus
  • Each cell of the thallus possess a single large chloroplast with a pyrenoid
  • Sporophyte is cylindrical only partly dependent on gametophyte for its nourishment. It is differentiated into bulbous foot and cyclindrical capsule. Seta is meristematic.
  • Endotheciumforms the sterile central column in the capsule. It have ony one order Anthocerotales

Class 3: Musci or Bryopsida

  • Gametophyte is differentiated into prostrate protonema and an erect gametophores
  • Gametophore ids foliose, differentiated into axis and lateral appendages like leaves but without midrib.
  • Rhizoids are multicellular with oblique septa
  • Elaters are absent in the capsule of sporangium
  • The sex organs are produced in seperate branches immersed in a group of leaves.
  • It has only three orders: Bryales, Andriales and Sphagnales

Bryophytes are used as a packaging material for fragile goods, glasswares etc.Mosses are good source of animal food in rocky and snow clad areas. Decoction prepared by boiling Sphagnum in water  is used for the treatment of eye disease.

3 0
3 years ago
What subunits form starch?
BaLLatris [955]
Carbohydrates: fructose, glucose, and <span>lactose</span>
4 0
3 years ago
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