Answer:
It Determines whether the protein can interact with other molecules
Explanation: Hope this Helps
Answer:
The positive charge of the histone proteins get reduced due to the process of histone acetylation, thus making the wrapping of DNA around the histones less tightened. The loose connected DNA afterward associates with the transcription factors for the articulation of the genes situated in that area.
Generally, when there is no requirement of gene anymore, the acetyl groups from the histones get withdrawn by the activity of histone deacetylase enzyme (HDAC9) that makes the DNA tightly wrapped and inaccessible again. In case, when less expression of histone deacetylase enzyme occurs, the process of deacetylation fails to take place. This indicates that within an immune cell, at the time of infection, the inflammatory gene, which was made available does not get re-wrapped firmly around the histones.
A molecular clock is a method used by researchers that uses mutation rates in DNA to estimate the length of time that two species have been evolving independently. This provides evidence of evolutionary descent because it can link to common ancestors.
To pump blood through out our body and to keep us alive
Hello There!!
<span>The blood is the circulating fluid connective tissue. It is the system of blood, heart and blood vessels. The main function of this system is to distribute the digested food and oxygen to the different parts of the body, in order to release energy to carry out life activities.
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1. Heart · Heart is triangular muscular pumping organs. · Heart of frog is situated ventrally to the liver in the pericardial cavity. · Heart is three –chambered. · Upper two chambers are called auricle sand lower one chamber is called ventricle. · Its anterior end is broader then posterior end. · The broader part anterior is known as auricle. · The posterior part is known as ventricle. · The ventricle is thick walled than auricles .right auricle is larger than left auricle.
Arterial system of frog
Blood vessels, which carry oxygenated blood away from heart to different part of the body, are called arteries. They constitute a system called arterial system. Truncus arterious gives two branches right aortic trunk and left aortic trunk. Each aortic trunk again divides into three branches- a) Carotid arch: it divides into – Lingual artery – it supplies blood to tongue and hyoid. Common carotid – it supplies blood to buccal cavity and brain. it consists swelling at the base called carotid labyrinth.
b) Systemic arch – two systemic arches move upward and then curve backward to join each other behind the heart to form dorsal aorta before meeting each other each systemic arch gives- Oesophageal artery – it supplies blood to osephagus. Occipito vertebral artery – it supplies blood to head and vertebral column. Subclavian – it supplied blood to shoulder and forelimb. From the junction of two systemic arches coeliaco – mesenteric artery arise which gives following branches. Coeliac artery arises and gives two branches – Hepatic artery artery – it supplies blood to liver. Duodenal artery –it supplies blood to duodenum. Intestinal artery – it supplies blood to small intestine (ileum). Spleenic artery – it supplies blood to spleen (meeting place of ileum and rectum). Posterior mesenteric artery- It is Long Branch and supplies blood to the rectum. The dorsal aorta runs backward and gives following branches- Gonadial artery – it supplies blood to testes and ovary. Renal artery- it supplies blood to kidney. At the end, the dorsal aorta runs posterior and bifurcates into right and left common iliac arteries. Each of iliac arteries gives Femoral artery – it supplies blood to hip and thigh. Sciatic artery – it supplies blood to lower region of hind legs. Epigastric artery- it supplies blood to urinary bladder.
c) Pulmo-cutanous arch- it divides into Pulmonary artery – it receives deoxygenated blood from different parts of the body and open into lungs. Cutanous artery- it supplies oxygenated blood to skin.
Venous System of frog
Blood vessels, which carry the deoxygenated blood from different parts of the body to the heart, are called veins. They constitute a system called venous system. Venous system of frog can be studied under too heading
A) Systemic Venous System This system includes the three large veins, which receives the deoxygenated blood from all the parts of the body and collect to the sinus venous. The three veins are- Right Precaval, Left precaval and Post cavals
1. Right and Left Precaval Vein: Each precaval is formed by the union of 3 veins External jugular vein - it is formed by the two veins. a. lingual vein – it receives deoxygenated blood from mouth and tounge. b. mandibular vein – it receives deoxygenated blood from lower jaw. innominate vein – it is formed by two veins. a. internal jugular vein- it receives deoxygenated blood from eye brain and skull. b. subscapular vein- it receives deoxygenated blood from shoulder and arm.subclavian vein- it is formed by two veins- a. brachial veins- it receives deoxygenated blood from fore limb. b. muscub cutanous vein – it receives deoxygenated blood from muscles and skin.
2. Post Caval Vein: It receives deoxygenated blood from following 3 veins. Hepatic vein- it receives deoxygenated blood from liver. Gonodial vein- it receives deoxygenated blood from gonads. Renal vein – it receives deoxygenated blood from kidney.
B) Pulmonary Venous System The pulmonary vein receives pure blood from lungs into left auricle of heart
Hope It helps!!
