Carbon, hydrogen and oxygen
Answer:
ABCD.Mga bobo kayo putanginanyo hahahahahahahahhaaha
Explanation:
12345
Steroid hormones affects cells by binding to intracellular receptor
complex that composed of a single polypeptide chains, which promote or inhibit
transcription of specific genes. The receptors for steroid hormones are located
inside the target cells specifically in the nucleus or cytoplasm, which bind to
regions of receptive genes.
<span>Therefore, the function of steroid hormones is to control gene
expression in target cells by selectively affecting the transcription of a set
of genes. The proteins concentration of the target cells are altered, which
could result to the modification of the phenotype of cell. </span>
Answer:
Please find the detailed explanation of this statement below
Explanation:
Firstly, a repressed gene is a gene whose expression has been inhibited or repressed. The lac operon in E.coli bacteria is a regulatory unit containing structural genes, a single promoter and operator regions. The promoter is the region where the transcription enzyme (RNA polymerase) binds to in order to transcribe the genes in the lac operon. The structural genes in the lac operon can only be expressed in the presence of lactose sugar.
However, in the absence of lactose, LAC REPRESSOR, which is a transcription factor (protein), prevents the binding of RNA polymerase to the PROMOTER region by binding to the OPERATOR region of the lac operon. This inhibits the expression of the lactose genes in the operon.
Note that, the structural genes in the lac operon (lacZ, lacY, lacA) code for proteins that help break down lactose sugar for energy in the E.coli bacteria. Therefore, a bacteria cell with a repressed lac operon will be unable to degrade lactose sugar.