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3 years ago

Which hormone uses a second messenger mechanism? testosterone estrogen norepinephrine cortisol none of these choices?

1 answer:

jeka943 years ago

4 0

Norepinephrine uses the Second Messenger System, which means, cells signal to each other what molecules have been released that will trigger a physiological reaction.

This phenomenon is activated after the ligand (ion or molecule) is bonded to its receptor (protein molecule), creating a variation that causes a chain-reaction, that will finally activate the Second Messenger. The latter will activate intercellular molecules that will be able to control the cell’s activity.

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The physical feautre of the land surface whether it is sloping,rolling,flat or level is called

timurjin [86]

A landform is a feature on the Earth's surface that is part of the terrain. Mountains, hills, plateaus, and plains are the four major types of landforms. Minor landforms include buttes, canyons, valleys, and basins. Tectonic plate movement under the Earth can create landforms by pushing up mountains and hills.

A plain is nothing but a low-lying relatively flat land surface with very gentle slope and minimum local relief. About 55% of the earth's land surface is occupied by plains. Most of the plain have been formed by deposition of sediments brought down by rivers.

Plateaus are elevated flatlands. In other words, it is flat land which is standing high above the surrounding area. Furthermore, they may have one or more sides with steep slopes. Also, depending upon the plateau, their height varies from a few hundred meters to several thousand meters.

5 0

3 years ago

Some people have freckles, and some people do not have freckles. If a child has freckles, at least one parent has freckles.

Volgvan

Answer:

There are two alleles for freckles.

Explanation:

3 0

3 years ago

Read 2 more answers

A new microorganism is isolated from a lake and is placed into a solution of KCl. The voltage difference across its membrane is

Leona [35]

Answer: $\Delta U=$ 1.922x10⁻²⁰ Joules

Explanation: Electric Potential Energy (U) is the energy a charged object has due to its location in an electric field and it will only exist with the object is charged.

Voltage or Electric Potential Difference (V) is external work done to move a charge from one point to another in a electric field.

These terms have a relationship, which is given by:

$\Delta U=q\Delta V$

where

q is the charge

Proton is positive and has a charge of 1.6x10⁻¹⁹C.

Unit for potential energy is Joule (J). The relation between mV and J is

1mV = 10⁻³J

Then:

V = 120x10⁻³

V = 0.12

So, for a proton to move from the negative side of a membrane to the positive:

$\Delta U=q\Delta V$

$\Delta U=1.6.10^{-19}.0.12$

$\Delta U$ = 1.922 x 10⁻²⁰

Energy necessary to transport a proton from negative side of the membrane to the positive is 1.922 x 10⁻²⁰J.

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3 years ago

If the mitochondria and chloroplasts in eukaryotic cells resulted from endosymbiosis between various prokaryotes, what features

const2013 [10]

Answer: A plasma, membrane, DNA and ribosomes

Explanation:

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1 year ago

Which type of prehension is exhibited by a 5-month-old infant?

Arlecino [84]

Prehension in philosophy and by definition means an interaction of an organism with a certain entity or event. For an infant who is 5-month-old, the prehension that is most commonly observed is the grasping of objects voluntarily.

This happens as they begin to consciously use their fingers in order to take hold and grasps objects. As of this time, they have not learn the finger isolation so they tend to use all their fingers as a whole entity.

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3 years ago