Biology, 22.08.2019 07:30 firepropr85

You have a liposome containing an interior aqueous solution containing 200 mm of nacl. if you want to shrink the liposome, what should be the concentration of solution of nacl in which you would you drop it? give a specific concentration (mm).

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Answer from: domdom71

To achieve this the solution in which the liposome is dropped must be hypertonic. In a hypertonic solution, there are more salts than in the cell or, in this case, a liposome. When we put cell or liposome in the hypertonic solution, there is more water inside than outside. The aim is to balance water concentration on the inside and outside of cell or liposome. So, the water will exit the cell and consequently it will shrink in size.
If we want the extracellular solution to be hypertonic, it must have more salts than the liposome. The concentration of NaCl must be higher than 200mM. If in liposome there are 200 mM of NaCl, in order to shrink, on the outside there must be twice that concentration (400 mM). So, all the water bound to the internal NaCl will exit the liposome and bind to the external NaCl.

Answer from: Quest

answer; i believe its (ovulation);

Answer from: Quest

transcription is a process in which information is rewritten. it is something our cells must do, in a more specialized and narrowly defined way. in biology, transcription is the process of copying out the dna sequence of a gene in the similar alphabet of rna. it needs to happen in the nucleus because that's where the dna is. dna is always inside the nucleus unless the cell is dividing.

transcription is the first step in gene expression, which involves copying a gene's dna sequence to make an rna molecule. transcription is performed by rna polymerases. it has three stages: initiation, elongation, and termination. rna molecules must be processed after transcription in eukaryotes.

explanation:

long version:

the protein synthesis consists two processes which are, transcription and translation. transcription takes place in the nucleus. it uses dna as a template to make an rna molecule. rna then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs. transcription is the first part of the central dogma of molecular biology: dna → rna. it is the transfer of genetic instructions in dna to messenger rna (mrna). during transcription, a strand of mrna is made that is complementary to a strand of dna.

these three stages are:

initiation: in which is the beginning of transcription.occuring when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

elongation: in which is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

termination: in which is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

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