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saveliy_v [14]
3 years ago
13

For excitation-contraction coupling, which of the following is/are required? and Why?

Biology
1 answer:
mihalych1998 [28]3 years ago
6 0

a). Calcium ion and ATP

Explanation:

The excitation and contraction of the muscles takes place by Action potential  creation.

The muscle contraction is initiated when calcium ions binds to troponin. The binding of calcium with protein complex troponin changes the configuraton to  make actin sites active for ATP binding. This binding causes myosin to reach the state of high energy ( excitation), in which myosin head gets detach from the active site.

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Gorillas are a predator. They eat food and rarely ever get killed for food. But if we take away their habitat by making buildings and houses then they will die for other causes like hunger. If the gorillas go extinct then the food change will get all messed up. The food they normally eat will over populate meaning the food gorillas eat (like fruit) will over populates and take over the area. That means it will start to take up the space that other plants need to grow. The other plants that other animals will need to eat will slowly start moving away because their food is dying. They will start to go somewhere else and mess up that habitat too. Those animals will eat the food needed by the animals that lived there originally and food will become scarce for animals that all need the same type of resources.
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3 years ago
A salamander relies on hydrogen bonding to stick to various surfaces. therefore, a salamander would have the greatest difficulty
Talja [164]

The hydrocarbons' surface.

Because the covalent link that exists between hydrocarbon surfaces is different from the surfaces to which the salamander can cling, the salamander has difficulties adhering to these surfaces.

The hydrogen bond is the bond that exists between hydrogen and a bigger molecule like nitrogen or oxygen, whereas a covalent bond includes sharing electrons.

<h3>What Are Hydrocarbons and What Do They Do?</h3>

Crude oil, natural gas, and coal are all examples of hydrocarbons, which are organic compounds made of hydrogen and carbon. The world's primary energy source and a highly flammable substance, hydrocarbons. Petrol, jet fuel, propane, kerosene, and diesel are only a few of its uses.

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5 0
2 years ago
What is The relationship between sunlight and chlorophyll why are both of these needed first photosynthesis
geniusboy [140]

Answer:

The relationship between sunlight and chlorophyll is that chlorophyll absorbs sunlight and uses its energy to synthesise carbohydrates from CO2 and water.

These are both needed in photosynthesis because without sunlight and the chlorophyll, photosynthesis would not be able to synthesise carbohydrates from CO2.

7 0
3 years ago
Temperate environments have some of the best soils in the world, even compared to tropical soils. The reason is
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Temperate environment have the best soil in the world because of higher nutrient levels.

<h3>What is soil?</h3>

Soil is the topmost layer of the earth on which plants grow.

Types of soil include:

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The best soil for plant growth is loamy soil because it contains the most nutrients.

Temperate environment have the best soil in the world because of higher nutrient levels.

Learn more about soils at: brainly.com/question/25831026

5 0
2 years ago
What was the purpose of adding methotrexate to the cells expressing a genetically-engineered Dihydrofolate Reductase enzyme in t
ira [324]

Answer:

Methotrexate inhibits the synthesis of DNA, RNA, and protein synthesis of the cells in the experiment.

Explanation:

Methotrexate competitively inhibits the enzyme dihydrofolate reductase (DHFR) which is involved in the synthesis of tetrahydrofolate from the inactive dihydrofolate. The methotrexate blocks the enzyme by binding to its active site thereby preventing further reaction of the dihydrofolate reductase enzyme and dihydrofolate. Tetrahydrofolate is a useful material for the de novo synthesis of thymidine, a nucleoside. And without thymidine, DNA synthesis is hindered. Methotrexate therefore inhibits the synthesis of DNA, RNA, thymidylates and of course protein synthesis.

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3 years ago
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