0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Where is it likely that you will find the receptor molecules for chemical signal?
neuron cells
Is protein needed to move water across a membrane?
Yes, water does not pass directly through the phospholipid bilayer of cell membranes. It must have a special protein channel to move through.The plasma membrane of all cells (archaea, eubacteria, plants, animals, fungi) is made of a double layer of phospholipids, which have tails of hydrophobic (water repelling) fatty acids that aggregate together in the middle of the membrane, and "heads" of a wide variety of phosphate complexes that are hydrophilic (water attracting) and form layers on both the inside and outside of the membrane.This structure forms the basic sheet of membrane that surrounds all cells on their outer surface.Only very small, uncharged, and nonpolar molecules can pass directly through the lipid bilayer structure, because the nonpolar layer of fatty acids tails repels ions (charged atoms or molecules) and molecules of any size that are polar.There are very few molecules small enough to simply diffuse (or float) through this structure.The only examples I can find are nonpolar gas molecules like oxygen, carbon dioxide, and nitrogen.All other molecules must have a specific membrane protein to allow them in or out of cells. These proteins can take various forms (channels, gates, transport mechanisms of multiple types.) Water is a very polar molecule and special channels called aquaporins were discovered in 1990 that allow water molecules to pass through in single file.Since they were first found, hundreds of specific types have been found, including eleven specific types in human cells. Cells that have these channels allow water to diffuse in and out.Cells without them are practically impervious to water.
What happens to a cell plant cell or animal cell when placed in following solution a hypotonic solution b isotonic solution c hypertonic solution?
When placed in an isotonic solution (i.e. a solution where the concentration of water molecules is roughly equal to the that within cells), there is equal diffusion of water into and out of the cells. Therefore, the cells find this environment suitable. In a hypotonic solution (i.e. a solution where the concentration of water molecules is much more than that within cells) water diffuses into cells as a result of which the cells swell. Excessive swelling causes the cells to burst, a phenomenon called cell lysis In a hypertonic solution (i.e. a solution where the concentration of water molecules is lesser than that within cells) water moved out from within cells to the surrounding medium. As a result of this, cells shrink.
How do you find if a molecule has a linear shape?
No, many linear molecules are nonpolar. A polar substance often has a bent or otherwise asymmetrical structure.
What weighs the motion of molecules?
thermometer. Temperature has to do with the average kinetic energy of molecules, and we find it with a thermometer
Carbohydrates and lipids are very large organic molecules Which two bonds do you expect to find most in these molecules?
ANSWER: nonpolar cavalent bonds and polar covalent bonds
Where is it likely that you will find the receptor molecules for chemical signal?
neuron cells
Where are molecules in the body?
You will find cells in any living thing or person.
Is protein needed to move water across a membrane?
Yes, water does not pass directly through the phospholipid bilayer of cell membranes. It must have a special protein channel to move through.The plasma membrane of all cells (archaea, eubacteria, plants, animals, fungi) is made of a double layer of phospholipids, which have tails of hydrophobic (water repelling) fatty acids that aggregate together in the middle of the membrane, and "heads" of a wide variety of phosphate complexes that are hydrophilic (water attracting) and form layers on both the inside and outside of the membrane.This structure forms the basic sheet of membrane that surrounds all cells on their outer surface.Only very small, uncharged, and nonpolar molecules can pass directly through the lipid bilayer structure, because the nonpolar layer of fatty acids tails repels ions (charged atoms or molecules) and molecules of any size that are polar.There are very few molecules small enough to simply diffuse (or float) through this structure.The only examples I can find are nonpolar gas molecules like oxygen, carbon dioxide, and nitrogen.All other molecules must have a specific membrane protein to allow them in or out of cells. These proteins can take various forms (channels, gates, transport mechanisms of multiple types.) Water is a very polar molecule and special channels called aquaporins were discovered in 1990 that allow water molecules to pass through in single file.Since they were first found, hundreds of specific types have been found, including eleven specific types in human cells. Cells that have these channels allow water to diffuse in and out.Cells without them are practically impervious to water.
Why it is difficult to find a completely covalent compound?
It is difficult to find a completely nonpolar covalent bond (which have no ionic character) because in this type of bond, the electrons are equally shared. This only happens when two atoms of the same electronegativity are bonded, which basically means to atoms of the same element. Thus, only elemental molecules such as diatomic chlorine gas have completely nonpolar covalent bonds.
In what types of cells do you find large numbers of ribosomes?
Large numbers of ribosomes are present in cells that specialize in producing protein molecules. The mitochondrion contains its own DNA and ribosomes.
What are examples of eukaryote are?
Animalia ( Animal cell), Plantae (Plant cell), Fungi.
DNA molecules are found in the nucleus?
Yes, all of the cells DNA is found in the Nucleus
What happens to a cell plant cell or animal cell when placed in following solution a hypotonic solution b isotonic solution c hypertonic solution?
When placed in an isotonic solution (i.e. a solution where the concentration of water molecules is roughly equal to the that within cells), there is equal diffusion of water into and out of the cells. Therefore, the cells find this environment suitable. In a hypotonic solution (i.e. a solution where the concentration of water molecules is much more than that within cells) water diffuses into cells as a result of which the cells swell. Excessive swelling causes the cells to burst, a phenomenon called cell lysis In a hypertonic solution (i.e. a solution where the concentration of water molecules is lesser than that within cells) water moved out from within cells to the surrounding medium. As a result of this, cells shrink.
Are hormones target molecules or signal molecules?
Hormones affect target cells because target cells have receptors that bind with certain hormones (they're specific). If a cell does not have a receptor then it is not affected by hormones. Target cells (which do have the receptor for a particular hormone) would be affected by the hormone.
What do you find in cells?
you can find amyloplast in animal and plant cells
What are three examples of eukaryotic organisms?
animal cells and plant cells are examples of Eukaryotes. Such cells can be found almost anywhere. Remember, Eukaryotic cells have a nucleus to them and Prokaryotic cells don't. The inside of your cheek is one of the easiest places to find animal cells if you want to look at them and for eukaryotic plant cells you can use the skin of an onion
