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Stella [2.4K]
3 years ago
9

What chemical ion is responsible for initiating the contraction of a muscle fiber?

Biology
1 answer:
Semenov [28]3 years ago
4 0
Calcium ion is responsible for Muscle Contractions.
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Which of the following statements correctly describes the effect a nonsense mutation would have on a gene?a) It changes an amino
TEA [102]

Answer:

c) It introduces a premature stop codon into the mRNA

Explanation:

Nonsense mutation is a type of point mutation (single nucleotide base is changed) which leads to premature stop codon. Stop codons are also called nonsense codons and that is way this type of mutation is called nonsense mutation. As a consequence, synthesized protein is incomplete and shorter than it should be (truncated protein), usually nonfunctional.

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List two ways in which an invasive species can be introduced to a new environment.
shtirl [24]

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Hitched a ride or Humans brought it and planted it.

Explanation:

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The distance, measured in degrees, north and south of the equator is referred to as _____.
Vlad [161]

Answer;

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-The distance, measured in degrees, north and south of the equator is referred to as latitude.

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PLEASE HELP ME ASAP
kati45 [8]

The only reasonable answer I can see is

D. Ectothermic animals need the warmth before they can move around to hunt food.

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A plants response to light is known as
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Photos means light
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phototropism means turning towards the light

answer is A

(gravotropizom is like gravity, if you hold that kind of plant sideways, it will try to turn sidewyas, dunno thigmatropism, helio tropizom is turning toward the sun (but ther are other light sources other than sun))
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3 years ago
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