Answer:
Graafian follicle
Explanation:
Ovulation is the process observed in the females during which the females release the oocyte or the female egg cell. The process of ovulation takes place every month during the 14th day of the menstrual cycle.
The primary follicle is formed in the females before birth but after the puberty, each month the primary follicle matures into the secondary and then tertiary follicle called the Graafian follicle. This Graafian follicle releases the secondary oocyte.
Thus, Graafian follicle is the correct answer.
Exercise is very vital to the body,it a form of physical activity.the sole aim of excercise is to maintain stamina, flexibility,keep fit and be overly healthy and well.
When we excercise, our heart rate increases and then it returns to the normal rate when with rest,when we take a break.there is reflection of vasoconstriction in the fingers as the blood is shunted to only the exercising muscles because it is noted that the pulse amplitude of the heart is always small after excercise and and increases slowly during recovery.
The amount of blood the heart pumps in a minute,that is the amount of blood ejected by the contraction of the left ventricle into systemic circulation increases when we are exercising and resistance to blood flow by skeletal muscles decreases.the blood vessels will try to adapt to the condition (exercise) inorder to control blood flow and as well meet energy demands.
When we finish exercising,our body temperature increases which will inturn cause increase in the pulse rate and the blood in our body makes way to our skin,hands and legs inorder to clear off the energy that was generated by the body(muscles) during exercise
Answer:
<em>Chargaff: </em>The work of Erwin Chargaff has major contributions towards understanding of DNA structure as a double helix. Although, he didn't propose the DNA as a double helix, but he was the first scientist two establish two rules that lead to the discovery of DNA as a double helix. Briefly, he proposed that (1) in any DNA, the amount of Guanine are always equal to the amount of Cytosine and likewise, the amount of Adenine are always equal to the amount of Thymine; and (2) the amount of guanine, cytosine, adenine and thymine bases are different in each species. This observation supported the idea later that DNA is the heriditary material rather than proteins.
<em>Franklin</em><em>:</em> Rosalind E. Franklin is known for her work on understanding the molecular structure of DNA via X-Ray diffraction. For that, she exposed crystallized DNA moleculeto X-rays and some of the rays were deflected back thus forming a diffraction pattern. She was the first scientist that produces real images of DNA explaining its molecular structure. As an example, I have attached the Photo 51 she took while working at King's College London. Her work led to the actual discovery of DNA as a double helix (Watson and Crick Model) which we know today.
<em>Watson and Crick</em>: James Watson and Francis Crick proposed the 3D structure and model of the DNA helix which we know as of today. Precisely, their work explained that DNA is a double-stranded, antiparallel, right-handed helix. Further, the nitrogenous basis proposed earlier (A, T, G, C) are attached to sugar-phosphate backbone via hydrogen bonds. It is one of the major discoveries in molecular biology.
The severity of withdrawal can vary from mild symptoms however, they usually begin 6 to 24 hours after the last drink. These symptoms include delirium, hallucinations, and autonomic instability.
Explanation:
A plant cell wall is arranged in layers and contains cellulose microfibrils, hemicellulose, pectin, lignin, and soluble protein. These components are organized into three major layers: the primary cell wall, the middle lamella, and the secondary cell wall
