A) Each DNA nucleotide is made up of a sugar, a phosphate group ... Adenine and thymine are connected by two hydrogen bonds, and cytosine and guanine are ... In the case of RNA, the five-carbon sugar is ribose. DNA is made up of two strands that are twisted around each other to form a right-handed helix, called a double helix. Base-pairing takes place between a purine and pyrimidine: namely, A pairs with T, and G pairs with C. In other words, adenine and thymine are complementary base pairs, and cytosine and guanine are also complementary base pairs. This is the basis for Chargaff’s rule; because of their complementarity, there is as much adenine as thymine in a DNA molecule and as much guanine as cytosine. Adenine and thymine are connected by two hydrogen bonds, and cytosine and guanine are connected by three hydrogen bonds. The two strands are anti-parallel in nature; that is, one strand will have the 3′ carbon of the sugar in the “upward” position, whereas the other strand will have the 5′ carbon in the upward position. The diameter of the DNA double helix is uniform throughout because a purine (two rings) always pairs with a pyrimidine (one ring) and their combined lengths are always equal.
Answer:
a. Osteogenic cells can differentiate into osteoclasts
Explanation:
Osteoblasts are the cells that are formed from osteogenic cells. The osteogenic cells enter the process of bone formation. There is a secretion of organic compounds and salts to form osteoblast. Osteoclasts are the very large cells that are formed when many monocytes fuse together and are concentrated in endosteum. Osteoclasts are the cells responsible for bone resorption.
Because the walls of veins have high compliance, they can accommodate a relatively large volume of blood with a relatively small increase in internal pressure.
<h3>What are veins?</h3>
Veins are specific blood vessels of the circulatory system that transport deoxygenated blood to the hearth.
Vein blood vessels have high compliance to increase the volume of blood cells that can be transported.
During this process, the internal pressure of the walls in the vein blood vessel is minimized.
Learn more about veins here:
brainly.com/question/64497
Answer:
Answer is the hierarchy of needs.
Explanation:
This theory comprises of a five-tier model of human needs. Its levels are physiological, safety, love, esteem and self-actualization as arranged from the bottom to the top.
Answer:
a. Due to the lack of blood supply.
b. Due to a toxin.
Explanation:
