The answer is Ivory.
Made from the teeth and tusks of large mammals, most frequently elephants,<u> ivory </u>is extremely rare to come by today
What is ivory?
Ivory is a tough, white substance made up of the tusks and teeth of animals, generally those of elephants. Dentine, one among the physical components of teeth and tusks, makes up the bulk of ivory.
No of the origin species, the teeth and tusks of mammals have the identical chemical makeup.
The term "ivory" are often used to refer to any mammalian teeth or tusks of commercial importance that are large enough to be carved or scrimshawed because the trade in some teeth and tusks other than elephant's is well established and ubiquitous.
In addition to natural ivory, synthetic ivory also can be made, therefore it's not necessary to remove the substance from animals (unlike natural ivory). Tagua nuts are often carved to resemble ivory as well.
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Answer:
a) to provide NADPH for reductive biosynthesis and for dealing with oxidative stress
d) to provide ribose-phosphate for nucleotide and nucleic acid biosynthesis
Explanation:
During the pentose phosphate pathway, glucose 6-phosphate is oxidized into pentose phosphates. This pathway uses NADP as an electron acceptor and reduces it into NADPH. The products of this pathway, the pentose phosphates are used by the cells to synthesize nucleic acids (DNA and RNA). The pentose phosphates are also used for the synthesis of nucleotides and coenzymes such as NADH, FADH2, etc.
These synthetic pathways are particularly occurring at a higher rate in the rapidly dividing cells such as the cells of bone marrow, skin. The NADPH formed during this pathway is used by cells as an electron donor for the reactions of reductive biosynthesis. Some of these pathways are the synthesis of fatty acids, cholesterol and steroid hormones. NADPH is also involved in scavenging reactive oxygen species such as oxygen radicals. These ROS are responsible for oxidative stress.
Answer:
An ionic bond is formed between a metal and a non-metal. Covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds.
Explanation:
There are two types of atomic bonds - ionic bonds and covalent bonds. They differ in their structure and properties. Covalent bonds consist of pairs of electrons shared by two atoms, and bind the atoms in a fixed orientation. Relatively high energies are required to break them (50 - 200 kcal/mol). Whether two atoms can form a covalent bond depends upon their electronegativity i.e. the power of an atom in a molecule to attract electrons to itself. If two atoms differ considerably in their electronegativity - as sodium and chloride do - then one of the atoms will lose its electron to the other atom. This results in a positively charged ion (cation) and negatively charged ion (anion). The bond between these two ions is called an ionic bond.
6.72 m/s2 would be the answer.
