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Katarina
5 days ago
8

Place the following events of excitation in the correct order. 1) ion channels on the sarcolemma open and sodium ions enter the

muscle fiber 2) the entry of sodium ions into the muscle fiber depolarizes the sarcolemma locally 3) acetylcholine is released from vesicles in the motor neuron into the synaptic cleft 4) an action potential arrives at the axon terminal of a motor neuron 5) acetylcholine binds to ligand-gated sodium ion channels in the motor end plate
Biology
1 answer:
11111nata11111 [2.5K]5 days ago
6 0
4, 3, 5, 1, 2.
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How does industrial agriculture promote farming techniques that are ecologically destructive?
s2008m [2378]

Industrial farming practices have harmful ecological impacts due to the use of fertilizers and processed animal feed. The fertilizers contain toxic chemicals that might not appear on the plants, as their primary role is to eliminate pests. The real harm occurs when fertilizer particles dissolve in water and seep into the soil, contaminating the water table. This results in the water that was once clean becoming tainted. The build-up of various pesticides can lead to the death of aquatic life and even affect humans. Furthermore, over time, it can degrade soil quality by reacting with other soil components to form toxic substances.

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21 day ago
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The structure labeled as X is the ______, so the cell in the image is a _________. The structure labeled as W is the __________,
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The structure identified as X is the Nucleus, indicating that the cell depicted is a Eukaryotic cell. The entity recognized as W is the Chloroplast, confirming that the cell is of a Plant type.

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6 0
20 days ago
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If a more concentrated initial solution of sodium bicarbonate was used in beaker C, would it require more or less bicarbonate to
lana [2441]

Response:

It would need a lower amount of bicarbonate to neutralize the acid.

Explanation:

Sodium bicarbonate (NaHCO3) is a partially soluble sodium salt that breaks down in water to create a weakly basic buffer solution. It separates in water releasing bicarbonate ions (HCO−), sodium ions (Na+), and H+.

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)

Buffer solutions are maintained in equilibrium. In a solution with a strong acid, the conjugate base reacts, while other carbonate ions release to form carbonic acid, driving the solution back toward balance.

HA ⇄ H+ + A-

Due to its buffering capability, which is how effectively it stabilizes the equilibrium, less bicarbonate will be required later on to neutralize the acid.

6 0
18 days ago
Two true-breeding stocks of pea plants are crossed. One parent has red, axial flowers, and the other has white, terminal flowers
-BARSIC- [2551]
The probability of generating plants with white axial flowers is 1/16. Based on the given illustration, all F1 offspring exhibited red axial flowers, indicating that the genes for red and axial traits are dominant over those for white and terminal traits in pea plants. Let's denote the allele for flower color as A (red) and a (white), and for flower position as B (axial) and b (terminal). The genotype of pure-breeding red axial flowers would be AABB, while pure-breeding white terminal flowers are represented as aabb. Crossing these results in F1 genotype AaBb, which shows all red axial flowers. For the F2 generation from AaBb crossed with AaBb, the progeny breakdown is: 9 A_B_ red/axial, 3 A_bb red/terminal, 3 aaB_ white/axial, and 1 aabb white/terminal. Consequently, the chance of generating plants with white axial flowers in the F2 generation is 1/16.
8 0
1 month ago
Calix’s karyotype showed that he has a genotype of XXY. Explain how nondisjunction caused Calix to be XXY.
vlada-n [2515]

Answer:

An XY or XY gamete combines with a standard gamete (X or Y)

Explanation:

Meiotic nondisjunction refers to the occurrence where chromosomes do not separate correctly during meiosis I or II. This process results in abnormal gametes, meaning gametes that may have excess or insufficient chromosomal content.

The fusion of these abnormal gametes created by nondisjunction with a typical gamete (either X or Y chromosome) leads to a condition known as ANEUPLOIDY, a chromosomal anomaly. In the instance of Calix, having an XXY configuration represents an ANEUPLOIDY state which may result from the fusion of either a XX gamete with a Y gamete, or an XY with an X. The XY or XX gametes are generated from nondisjunction.

4 0
1 month ago
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