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3 years ago

Air pollution:

Biology

1 answer:

Aleksandr-060686 [28]3 years ago

5 0

Answer:

Since the early 1900s, many glaciers around the world have been rapidly melting. Human activities are at the root of this phenomenon. Specifically, since the industrial revolution, carbon dioxide and other greenhouse gas emissions have raised temperatures, even higher in the poles, and as a result, glaciers are rapidly melting, calving off into the sea and retreating on land.

Explanation:

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_The endplate potential (EPP) at the frog neuromuscular junction occurs because ACh simultaneously increases the conductance of

Hoochie [10]

Complete question:

The endplate potential (EPP) at the frog neuromuscular junction occurs because ACh simultaneously increases the conductance of the postsynaptic membrane to Na and K

True
False

Answer:

TRUE

Explanation:

The Acetylcholine neurotransmitter is released from the presynaptic cell by the process of exocytosis.

Once the molecule is in the intercellular space, it moves forward the postsynaptic membrane to join its receptor in the motor plate.

Once the joining has occurred, the receptor acquires a channel shape allowing the ion transference that will make possible the modification of the action potential. Ions traffic will consist of the pass of sodium and calcium to the interior of the cell and potassium to the exterior. Quantitatively, the interchange Na-K is the most significant.

K+ follows a concentration gradient, while Na+ follows an electrochemical gradient. The interchange results in an increase of positive charges in the interior of the muscular cell.

Whenever there is a sufficient number of Acetylcholine receptors are active, the depolarization threshold of the motor endplate is exceeded. This activates an action potential that extends to the rest of the muscle membrane.

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2 years ago

Which of the following is the best representation of the limiting factors affecting the elk population in this ecosystem?

erastovalidia [21]

Answer:

Number of wolves, and harshness of winter.

Explanation: I took the test

7 0

3 years ago

HELPPPPP LOTS OF POINTS

ZanzabumX [31]

Answer:

Explanation:

its literally a cell law .-.

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3 years ago

Read 2 more answers

Which can reduce the amount of organic material discarded in landfills?

ch4aika [34]

Answer: A

Biomass energy can reduce the amount of organic material discarded in landfills.

7 0

2 years ago

The kernel color in wheat is a continuous trait determined by two additive genes, each with two alleles, that equally contribute

dedylja [7]

Answer:

Phenotypic ratio: 1:4:6:4:1

Punnett square: Below in the explanation box

Frequency distribution: In the attached files

Explanation:

<u>Available data</u>:

The kernel color in wheat is a continuous trait determined by two additive diallelic genes
The red kernels are determined by two genes and two dominant alleles (R1R1R2R2)
The white kernels are determined by two recessive alleles at the same two genes (r1r1r2r2)
R1 and R2 alleles are dominant over r1 and r2, respectively

1st Cross: a true-breeding red plant with a true-breeding white plant

Parentals) R1R1R2R2 x r1r1r2r2

Gametes) R1R2, R1R2, R1R2, R1R2

r1r2, r1r2, r1r2, r1r2

F1) 100% R1r1R2r2

2nd Cross: F1 progeny are selfed

Parentals) R1r1R2r2 x R1r1R2r2

Gametes) R1R2, R1r2, r1R2, r1r2

R1R2, R1r2, r1R2, r1r2

Punnett square) R1R2 R1r2 r1R2 r1r2

R1R2 R1R1R2R2 R1R1R2r2 R1r1R2R2 R1r1R2r2

R1r2 R1R1R2r2 R1R1r2r2 R1r1R2R2 R1r1R2r2

r1R2 R1r1R2R2 R1r1R2r2 r1r1R2R2 r1r1R2r2

r1r2 R1r1R2r2 R1r1r2r2 r1r1R2r2 r1r1r2r2

F2) Genotype:

1/16 R1R1R2R2 (dark red)
2/16 R1R1R2r2 (red)
1/16 R1R1r2r2 (light red)
2/16 R1r1R2R2 (red)
4/16 R1r1R2r2 (light red)
2/16 R1r1r2r2 (very light red)
1/16 r1r1R2R2 (light red)
2/16r1r1R2r2 (very light red)
1/16 r1r1r2r2 (white)

Phenotype:

1/16 R1 R1 R2R2, dark red phenotype
4/16 R1r1R2R2 + R1R1Rr2, red phenotype
6/16 R1r1 R2r2 + r1r1R2R2 + R1R1r2r2, light red phenotype
4/16 R1r1 r2r2 + r1r1R2r2, very light red phenotype
1/16 r1r1r2r2, White phenotype phenotype

Phenotypic ratio: 1:4:6:4:1

Frequency table:

<u>DOSAGE FREQUENCY</u>

Dark red 1/16

Red 4/16

Light red 6/16

Very light red 4/16

White 1/16

3 0

2 years ago