<span>arteries that carry blood pumped from the heart – these are the largest and strongest. veins that return blood to the heart. capillaries, which are tiny vessels that connect arteries and veins, and allow blood to come into close contact with tissues for the oxygen, carbon dioxide, food and waste.
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Answer:
1. Óxidos são compostos binários formados pela reação do oxigênio com outros elementos.
2. Além disso, a tonificação também pode ficar feia e ocorrer em tons de preto e marrom. Nos casos mais graves, a tonalidade pode se transformar em corrosão e causar danos permanentes à superfície da moeda. Nos piores casos, a corrosão pode tornar a superfície da moeda porosa de tal forma que parece que foi tratada com jato de areia
3. (por exemplo, Li2O). Os óxidos são compostos binários de oxigênio com outro elemento, por exemplo, CO2, SO2, CaO, CO, ZnO, BaO2, H2O, etc. Estes são denominados como óxidos porque aqui, o oxigênio está em combinação com apenas um elemento.
Explanation:
Answer:
Argon's atoms have 18 protons, 22 neutrons in its nucleus, orbited by 18 electrons- its atomic mass= P 18 +N 22.
Explanation:
Atoms are the most basic unit of matter that makes up elements. Atoms are composed of electrons orbiting neutrons and protons surrounding a nucleus.
The atomic number is defined as the number of protons in an atom, while the atomic mass is the number of protons and neutrons.
The element Argon, Ar is a noble gas, that exists in a gaseous, inert, state at temperature. Its atoms have 18 protons, 22 neutrons in its nucleus, orbited by 18 electrons- its atomic mass= P 18 +N 22.
There are 8 valence electrons in its outer shell, thus:
- Ar is not very reactive, as it does not require electron sharing in atomic bonding.
- It shows low conductivity, as there are no free electrons
Environmental factors typically activate genes in a cell by causing the cell to transcribe specific DNA segments to mRNA for translation.
This interaction is an example of environmental factors affecting <u><em>genetic expression</em></u>. In these situations, the environment causes specific segments of DNA to be expressed, meaning they are transcribed to mRNA and subsequently used to form proteins.
Meanwhile, other parts of the genome remain or are forced to be silent. This can be a result of mutations or simple biochemical reactions between the environment and the genome.
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Answer:
Pleiotropy
Explanation:
<em>Pleiotropy is a genetic term used to describe a phenomenon in which multiple traits or phenotypic expressions are dictated by a single gene. </em>
<em>Pleiotropy </em>was first discovered by Mendel during his experiment with pea plant when he noticed that flower colour is always related to the leaf axil as well as seed coat colour.
There are different types of pleiotropy including:
- Gene pleiotropy
- Developmental pleiotropy
- Antagonistic pleiotropy
- Selectional pleiotropy
In the case of marfan syndrome, inheritance of a single allele results in tall and long limb, cardiovascular and eye defects. This thus means that that single allele which represents a gene is responsible for expression of those traits. A clear cut case of pleiotropy.