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Bumek [7]
3 years ago
10

which statement correctly describes how the amount of ofoxygen in the earth’s atmosphere has changed over time?

Biology
1 answer:
Kay [80]3 years ago
3 0

Answer:

Based on the relative volumes of the gases in Earth’s atmosphere, nitrogen is actually more than 3 times more than oxygen. Because the troposphere is the lowest atmosphere layer, it contains 75 percent of the atmosphere’s mass.. From largest to smallest, Earth’s atmosphere composition contains nitrogen, oxygen, argon, CO 2 and trace gases.

Explanation:

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You experimentally apply a toxin to a muscle and find that it does not contract when you electrically stimulate the motor neuron
Furkat [3]

The question provided is not complete as it lacks the group of choices, however the group of choices are given as follows:

A. A contraction fails to occur because an action potential is not generated in the muscle cell.

B. A contraction fails to occur because this toxin directly prevents ion release from intracellular stores.

C. A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction.

D. A contraction fails to occur because this toxin prevents cross bridge formation and thereby directly prevents contraction.

E. C and D are both true

Answer:

The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.

Explanation:

A muscle contraction takes place when action potential bring to muscles by nerves, which is traveled with the help of motor neuron and imitated the muscle contraction.

Acetylcholine or Ach is a chemical messenger to bring the nerve impulses between a nerve and a muscle. If the receptor is block with applying toxin muscle will not contract as ACh will not be able to propagate the nerve impulse to the muscle so there will be no action potential.

The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.

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3 years ago
What would be the effect on triacylglycerol and phospholipid synthesis if the gene for the lipin protein is underexpressed? plac
Nadya [2.5K]

Answer:

Explanation:

The concentration of the lipids will increase: phospholipids generated from CDP-DAG and a polar head group

The concentration of the lipids will decrease: phophosplipids generated from DAG and activated head groups "triacylglycerols"

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a semipermeable membrane has an 8 percent salt solution on the left side and a 9 percent salt solution on the right side. What w
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The water will move by osmosis from the less-concentrated solution each is on the left to the more-concentrated solution. Hope this helped!
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IRINA_888 [86]

Answer:

B

Explanation:

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