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andrew-mc [135]
3 years ago
5

A flu virus can remain infectious on surfaces such as desk and doorknobs for long periods of time how does the ability of the fl

u virus to remain infectious on surfaces lead to high rates of the flu illness
Biology
1 answer:
Sunny_sXe [5.5K]3 years ago
3 0

Answer:

because the germs spread and when other people touch it and are carriers and they will probably get sick too

Explanation:

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Plants, algae, and many single-celled organisms can photosynthesize using a specialized cell organelle called a chloroplast. Do
Dovator [93]

Answer:

Yes

Explanation:

<em>The chloroplast is an organelle through which photosynthesis takes place. While the light reaction takes place in the thylakoid membrane of the chloroplast, the light-independent reaction or the Calvin cycle takes place in the stroma of the chloroplast. </em>

6 0
3 years ago
Read 2 more answers
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 method(s) do plants use to obtain nitrogen? Select all that apply.
elena-14-01-66 [18.8K]

Answer:

Plants can't use N2 as is so the first option is wrong. They do have relationships with bacteria that live in nodules of the root and convert the nitrogen into ammonia, a usable form for the plants. So the second option is correct. There are bacteria living in the soil as well that convert nitrogen to ammonia so technically option 3 is also correct. Again, nitrogen if present in water would be in the form N2 which is not usable by plants so 4 is wrong.

These are correct:

use bacteria to convert nitrogen to usable form

In obtain usable nitrogen compounds from the soil

4 0
3 years ago
Three genes control the production of tail structures in dogs. The wag1 gene promotes the production of tail structures. However
PIT_PIT [208]

Answer:

1. <u>ntrdr</u> --><u> brken</u> --|  <u>wag1</u>  --> <u>Tail structures </u>

2. Yes

Explanation:

(1) In this experiment three different genes are present;

     1) Wag-1 - promotes production of tail structures

      2) brkn gene - inhibits Wag-1 which leads to inhibition or inactive Wag1 gene and there is no tail formation.

      3) ntrdr gene - stimulates the activity of brkn gene thus this in turn inhibits Wag-1 gene and results in inhibiting the tail formation.

(2) The ntrdr gene stimulates the brkn gene and active brkn gene inhibits the wag-1 gene. As we know Wag1 gene is essential for tail formation. on removing out ntrdr gene result in inactive gene brkn thus allows the expression of the Wag-1 gene allowing tail growth in dogs.

3 0
3 years ago
As a participant in a study, Mary knew that the researchers believed if she worked under quiet conditions her productivity would
sergejj [24]
The answer is B hope that helps
3 0
2 years ago
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