_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.

c genetic engineering

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.