_biology
which molecules in eukaryotic cells regulate gene expression?
a. recombinant dna
b. plasmids
c. transcription factors
d. lactose

C (Transcription factors)

Explanation:

Gene regulation refers to the mechanisms that act to induce or repress the expression of a gene. These include structural and chemical changes to the genetic material, binding of proteins to specific DNA elements to regulate transcription. Gene regulation controls the rate and manner of gene expression.

Transcription factors are proteins that play an important role in regulating the transcription of genes by binding to specific regulatory nucleotide sequences. They help turn specific genes "on or off" by binding to nearby DNA. Transcription makes it easy or hard for RNA polymerase (an enzyme that synthesizes a RNA molecule from DNA template) to bind to the promoter of a gene.

Transcription factors that boost gene expression are called ACTIVATORS while those that decrease it are called REPRESSORS.

its like this, "if i give a plant an unlimited amount of sunlight,then the plant will grow to its largest possible size."

hope it let me know if it does or doesn't =^-^=

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure