Answer:
atomic number
Explanation:
The number of protons in an atom determines its atomic number, which is a defining trait of an element. In a neutral atom, the same number of protons also equals the number of electrons. However, the mass number or atomic mass is the total number of protons and neutrons.
The number of protons in the nucleus of an atom determines its atomic number. This is a defining trait of an element and determines its identity. For instance, any atom with six protons is the element carbon, which has an atomic number of 6 - this applies irrespective of the number of neutrons or electrons present.
Moreover, in a neutral atom, there must be an equal number of positive and negative charges implying that the number of protons is equal to the number of electrons. Thus, the atomic number indicates not only the number of protons but also the number of electrons in an atom.
The atomic mass or mass number of an atom, on the other hand, is the total number of protons and neutrons in an atom. Therefore, you can derive the number of neutrons by finding the difference between the mass number and the atomic number: (A - Z = number of neutrons).
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Answer:
the tail regrows at a rate of 5/8 inches per week.
The tail of a lizard is growing at a rate of 0.625 inches per week. This is calculated by dividing the total length the tail has regrown (3.75 inches) by the total time it took to grow (6 weeks).
The question is about the growth rate of a lizard's tail. We are told that after 6 weeks, the tail has regrown to 3 3/4 inches. So the question basically requires simple division to find out the rate at which the tail grows. The problem is solved as follows:
First, we convert 3 3/4 to a decimal to make it easier, which is 3.75 inches.
Then, we divide the length of the tail (3.75 inches) by the time it took to grow (6 weeks). This gives us the growth rate per week.
So, 3.75 ÷ 6 = 0.625. Therefore, the lizard's tail grows back at a rate of 0.625 inches per week.
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The energy sources from highest to lowest percentage of worldwide use would be :
1. Petroleum--2. Nuclear Power--3. Wind Power.
The fossil fuels produce more than 80% of energy and after the coal, petroleum is the second largest energy producing fossil fuel. Likewise more than 11% energy is produced from nuclear energy and more than 2.5% energy is produced by wind mills.
Just before mitosis occur in a stage known as Interphase the cell grows and makes copies of its genetic material in preparation for the cell's division into two identical cells. Therefore, option (C) is correct.
In the study of cell biology, the phase of the cell cycle known as mitosis is the stage at which replicated chromosomes are partitioned into two new nuclei. Mitosis is a method of cell division that results in the production of cells that are genetically similar and in which the total number of chromosomes is preserved. Since this occurs during mitosis, the process is often referred to as equational division.
Conventionally, the process of mitosis is broken down into five stages that are referred to as prophase, prometaphase, metaphase, anaphase, and telophase.
Learn more about mitosis, here:
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Answer:
True
Explanation:
Koch's postulates was proposed to show a causative relationship between a microbe and a disease.
Koch's postulates
•The microorganism must be present in large quantity in all organisms affected by the disease, but should not be seen in healthy organisms.
Koch abandoned this due to his discovery of asymptomatic carriers of cholera and of typhoid fever. Asymptomatic or subclinical infection carriers are seen in diseases, especially viral diseases.
•The microorganism must be seperated from a diseased organism and nutured in pure culture.
This can suspended for specific microorganisms or entities which(at the current time) can't be nutured in pure culture. Viruses uses host cells to grow and replicates and not in pure culture.
•The cultured microorganism should lead to disease when it infects a healthy organism.
It says "should", not "must".
NOTE: NOT ALL organisms introduced to an infectious agent will be infected which may be due to certain factors like general health and good immune functioning; vaccination; or genetic immunity. Its best explained using the resistance to malaria as a result of presence of at least one sickle cell allele.
•The microorganism must be reisolated from the inoculated, diseased experimental host and observed as being identical to the basic specific causative agent.
A single pathogen may lead to several disease conditions. A singualr disease infection may be due to several different microorganisms. While some pathogens cannot be cultured in a pure culture in the lab, others can infects humans.
b. It is much less than 5,730 years old.
c. It is slightly less than 5,730 years old.
d. It is slightly more than 5,730 years old.
B. It is much less than 5,750 years old.
Hope it helps.