Answer:
A. Mediator
Explanation:
Enhancers are cis regulatory sequences which are located very far - off from promoter sequence either upstream or down stream. They are capable of showing their impact even if they located far apart from promoter and Loop/Combinatorial model best describes the mechanism of action of enhancers.
The sequence of events are mentioned as under:
(1) First of all, activator binds to the enhancer;
(2) Co-activator which is also known as mediator binds to the activator;
(3) Chromatin remodelers bind with mediator at one end and heterochromatin on the other end so as to remove histones from heterochromatin and cause decondensation;
(4) General transcription factors (GTFs) bind the promoter;
(5) RNA polymerase II binds the promoter.
The enhancer forms a loop with the help of activator and mediator to reach near at promoter. In eukaryotes, activator does not interact with RNA polymerase directly, it interacts with the help of mediator so we can say that enhancer shows it's impact through protein-protein interaction.
Answer:
A.) food digestion. Smooth muscle and striated muscle are able to contract.
Explanation:
Unlike striated muscle, smooth muscle contracts slowly and automatically. Musculature of internal organs and the digestive system consists of smooth muscles. Therefore, they are involved in food digestion.
The quadriceps muscles will contract.
Explanation:
Quardriceps are muscles of the thigh located in the front.
It is a group of four vastus muscles named as-the vastus lateralis, vastus medialis, vastus intermedius, and the rectus femoris.
Muscles posses the ability of contraction so an action potential that will excite the muscle cells will obviously result in contraction of the muscles.
So we can conclude that on depolarizing the muscle cell of the quadriceps will result in contraction of quadriceps.
Answer:
False
Explanation:
It does not have to touch it in order to have a effect on it.
The start codon is the first codon of a messenger RNA (mRNA) transcript translated by a ribosome.
Nitrogen base sequence for the start codon is AUG.