You note a fuzzy growth on some of the food in your refrigerator. What is the name given to this step of the scientific method?

"In proteins, structural segments called ____ provide flexibility that allow parts of the protein to bend, fold, or move."

Rainbow [258]

Answer:

The correct answer is "random coils".

Explanation:

Random coil is a type of polypeptide secondary structure comprised of conformation that do not follow an established conformation but rather are oriented randomly. These random coils conformations provides flexibility to proteins, since the lack of a particular structure (such as alpha helices or beta sheets), allows the protein to bend, fold or move.

4 0

3 years ago

What was Anton van leeuwenhoek’s contribution in the devolopment of cell theory?

Law Incorporation [45]

use of a microscope containing improved lenses that could magnify objects almost 300-fold, or 270x. Under these microscopes, Leeuwenhoek <span>found motile objects. </span>

7 0

3 years ago

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Help asap please!

andreyandreev [35.5K]

Answer:

Active transport:

requires energy
molecules move from low to high concentration sides
Na+ and K+ move by active transport

Simple diffusion:

molecules move from high to low concentration sides

molecules pass between lipids
small non-polar and polar molecules

Facilitated diffusion:

molecules move from high to low concentration sides
involves channel proteins
move large molecules

Explanation:

Simple Diffusion is the pathway of only small molecules that freely move through the membrane by momentary openings produced by the lipids' movements. Diffusion is a slow process that requires short distances and pronounced concentration gradients to be efficient. An example of diffusion is osmosis by which water is the transported molecule.
Facilitated diffusion is the transport of hydrophilic molecules that can not freely cross the membrane. Channel protein and many carrier proteins are in charge of this transport. When uncharged molecules cross the membrane, they do it according to their concentration gradients, going from the more concentrated side to the lower concentrated one. When ions need to cross the membrane, the process depends on an electrochemical gradient. Glucose is an example of a hydrophilic protein that gets into the cell by facilitated diffusion.

Simple diffusion and facilitated diffusion are both passive transport processes because they only depend on electrochemical gradients, so they do not need any energy to occur.

Active transport is the transport of molecules that move against the electrochemical gradient, so it does need energy to happen. Molecules move from the lower concentration side to the higher concentration side of the membrane. Carrier proteins are in charge of active transport. The needed energy might proceed from the ATP molecules or the membrane's electric potential. An example of molecules moved by active transport are the Na and K.