From the pith outward, if you looked at a cross-section of a eudicot plant stem, you would see Xylem, vascular, cambium, and phloem in that order. The vascular cylinder divides the ground tissue into two discrete areas and is structured in a ring in eudicot stems.
The pith refers to the area of ground tissue that is included within the vascular cylinder. In general, eudicots possess three or more of the following traits: There are 2, 4, or 5 flower parts, or multiples of 4 or 5, and leaves have netted venation (pinnate or palmate). A ring of stem vascular bundles surrounds the pith, and seeds have two seed leaves (cotyledons).
As a result, we can assert that if you cut a cross-section of a eudicot plant stem, Xylem, vascular, cambium, and phloem in that order, you will find various plant tissues from the pith outward.
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Answer:
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<span>Proteins are composed of __20__ amino acids, of which __9__ are essential amino acids and __11__ are nonessential amino acids.</span>
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Answer:
The sodium-potassium pump contributes to the resting membrane potential.
Explanation:
This is the stage in which the neuron is not depolarize. 3Na+ are pumped outside through the sodium channels, while K+ channels are open for2 K+ to enter the cells.After some time the Na+ channels closed up. However some K+ channels still leaks , so that K+ still escape out of the cells to the external environment ,which contains more of Na+. Therefore at this stage there are more Na+ outside the neuron compare to the inside the neuron. Therefore the inside of the neuron is negative , because more K+ are leaving the cells, leaving negatively charged anions inside, and the outside is positive due to more Na+ are outside, and because the K+ leaking outwards.
The regulation of the Na+ and K+ ions movements is regulated by sodium potassium pumps along the membrane of the neuron. if the potential at this stage is measured, it has a value of -70mv, and it is called membrane potential.
