The link between a first messenger and a second messenger in a cell that responds to peptide hormones is usually

Biology

1 answer:

motikmotik4 years ago

4 0

Answer:

A G- protein

Explanation:

G proteins are molecules involved in signal transduction. They are often referred to as guanine nucleotide binding proteins. They bind to signal molecules at the exterior of the cell and are responsible for transmitting the signals from the exterior of a cell to the inside of the cell, which then results to a cellular response. G proteins are generally activated by a set of trans-membrane receptors called G protein coupled receptors and then deactivated by a set of proteins called the Regulator of G protein signaling (RGS proteins). In regulation, G proteins bind to GTP when they are active, but bind to GDP when they are inactive.

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Which statement best describes the difference between the sympathetic and parasympathetic nervous systems? A. The sympathetic sy

kvv77 [185]

The correct answer is option B, that is, the sympathetic system prepares the body for stress and activity and the parasympathetic system prepares the body for rest.

Both the parasympathetic and sympathetic nervous system are the components of the autonomic nervous system that works obligatorily. The sympathetic nervous system holds the key in controlling the body at the time of stress and injury, it is generally regarded as fight or flight. It contracts the muscles of the heart in order to enhance the rate of the heart.

On the other hand, the parasympathetic nervous system is responsible to monitor the function of the body when it is at rest. It assists in sustaining the homeostasis in the body. It relaxes the muscles of the heart in order to reduce the rate of the heart.

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shtirl [24]

Answer:

C. 1/2

Explanation:

Please see the attached Punnett square and probability.

1/2 = 2/4

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3 years ago

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The organelles that are known as the power plants or the powerhouses of the cell are the?

IrinaK [193]

That would be the mitochondria. They produce the energy needed for activities that occur in the cell, thus its being called the "powerhouse of the cell"

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4 years ago

The number of currently described species on the planet is about ________.

gayaneshka [121]

Answer:

The correct answer will be option- 1.5 million.

Explanation:

Biodiversity refers to the variety of species and ecosystem present on the earth in which they are part of it. The biodiversity comprises of three components: species diversity, ecosystem and genetic diversity.

The number of species present on this planet is found to be around 1.5 million in which 17,000 new species are being added to the existing number.

Thus, option- 1.5 million is the correct answer.

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3 years ago

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tankabanditka [31]

Answer
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Hope that helps

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