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hoa [83]
3 years ago
11

Which part of an amino acid is the only one that varies and is what defines the properties

Biology
1 answer:
ahrayia [7]3 years ago
3 0

Answer:

D

Explanation:

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Compare and contrast the mechanisms of getting material across the plasma membranes of cells. Tells me what the mechanisms are i
stepladder [879]

Answer:

Materials get transported from the cell by some mechanisms such as Active Transport, Passive Transport, Diffusion, etc.

Explanation:

Active Transport :

It is a process by which, materials are transported from the extracellular membrane to the intracellular membrane with the help of ATP. It has a few types :  

Primary Active Transport :  

This system is standing upon the sodium-potassium pump. It moves out   Na⁺ from the cell and allows the entry of K⁺ into the cell. In this process ATP is a source of energy. E.g, Sodium-potassium pump.

Secondary Active Transport :

It is mainly standing upon Primary Active Transport. In this process, the main key point is the concentration gradient. There is already a concentration gradient set up by the primary active transport. This system uses that up and moves other substances against their own gradient concentration. E.g, assuming, there is a high concentration of sodium outside the cell,  if a route such as a channel or a carrier protein is open then sodium ions will move into the cell.  In this transport system, some cotransporters are used who move in the sodium ion into the sodium gradient.  

Passive transport :

It is a process by which, substances cross the plasma membrane without acquiring any energy from the cell. Here, no energy is needed because the substances are moving from higher concentration to its lower concentration. E.g, cell membrane or plasma membrane works as a permeable or semipermeable membrane.  

Diffusion :

It is the movement of a substance across a membrane, due to the concentration gradient, without any help from other molecules. E.g, movement of the gaseous molecule from cell to cell.

8 0
3 years ago
Pam described two substances which participate in photosynthesis. Substance
Novosadov [1.4K]
Substance A is water and Substance B is chlorophyll
3 0
3 years ago
Read 2 more answers
A geologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit
Alja [10]

Answer:

B. Corundum

Explanation:

Using the Mohs scale of hardness, the mineral has a hardness greater than 6.5 (Steel nail) but less than 8.5 (Drill bit). The corundum has a hardness of 9.0, which means it cannot be scratched by a drill bit, but all the other choices have a hardness scale less than 6.5 but the mineral was not scratched by the nail. So the best answer would be B.

5 0
3 years ago
What are some similarities and differences between SEM and TEM microscopes
Flura [38]

SEM and TEM are electron microscopes whereas the SEM uses reflected electrons and TEM uses transmitted electrons to form an image

Explanation:

  • SEM is the scanning electron microscopes and TEM is the Transmission electron microscope
  • SEM works by detecting the scattered electrons to create an image of the sample whereas the TEM detects the transmitted electrons to create the image of the sample
  • SEM will only be analysing the surface of the sample whereas TEM collects data vertically also
  • TEM sample needs to cut thinner than SEM and TEM will give high-resolution images than SEM
7 0
3 years ago
The nurse hears the ventilator alarm come from the room of a client who is receiving mechanical ventilation. when arriving in th
azamat
I guess the nurse needs to *turn off the mechanical ventilation and then check on the patient.*
Brainliest answer?! Hope it helps..
4 0
3 years ago
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