Which of the following would be an example of how a model can be used in science.

Which cells are responsible for the movement of photosynthates through a plant?

jasenka [17]

Answer:

sieve-tube elements, companion cells

Explanation:

Sieve-tube elements and companion cells are responsible for the movement of photosynthes through a plant.

The sieve tube elements are shorter (almost organelle-free) living cells, placed end to end, forming the sieve tubes. Their transverse cell walls are called sieve plaques that make connections between cells and through openings called sieves establish the connection between the cytoplasm of adjacent cells. Each sieve is coated with calose (glucose polymer), which in winter can completely clog the vessel and then dissolve in spring. When infections occur or the vessel is parasitized, it can also be clogged with callose.

Companion cells are specialized parenchymal cells, which contain all the components that exist in living cells, including the nucleus, are the cells most closely linked to the sieved tube element. The Screened Tube Element and its companion cells are related in development, are derived from the same mother cell, and have several cytoplasmic connections to each other. Due to the many connections, the potential function of the companion cells is to release substances into the sieved tube element and, when the nucleus is absent, to include information molecules, proteins and ATP. When a screened element dies, its companion cells also die, which is a demonstration of this interdependence.

8 0

3 years ago

Why are nitrogen oxides considered harmful to humans?

Stolb23 [73]

Answer:

Nitrogen dioxide is an irritant gas, which at high concentration cause inflammation of the airways. ... Nox gases react to form smog and acid rain as well as being central to the formation of fine particles and ground level ozone, both of which are associated with adverse health effects.

6 0

2 years ago

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In the reaction that builds a fat,________ groups react with ________ groups

oee [108]

In the reaction that builds a fat, hydroxil groups react with carboxyl groups. Both hydroxil and carboxyl are functional groups in biological molecules. The hydroxil group is group of atoms found in organic compounds, expressed with the formula OH. The carboxyl group are found in acids.

4 0

3 years ago

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Coral reefs are built by a small organism called a polyp. The polyp creates the structure of the coral reef by building a ______

KatRina [158]

The correct answer that would best complete the given statement above would be the first option. Coral reefs are built by a small organism called a polyp. The polyp creates the structure of the coral reef by building a CUP out of a calcium carbonate. The skeletons of these tiny corals secreted by the lower portion of the polyp. Hope this answer helps.

6 0

3 years ago

Which of the following would be considered a human activity with a positive impact on the environment?

Galina-37 [17]

A and D I think or A and B

3 0

2 years ago