Answer:
Dana filtered the sample and larger granules of the sample were left behind.
Explanation:
If a substance is pure, it will have a uniform composition throughout. It will not separate into particles of various sizes.
One of the characteristics of pure substances is that they are homogeneous. A mixture is definitely made up of particles of various sizes.
Since the particles was filtered and larger granules were left behind, the sample has been separated by a physical method (filtration). Only a mixture can be separated by physical methods. It is not a pure substance.
How is electron movement related to covalent bonding in
ammonia, NH3?
A) Electrostatic
sharing in a sea of electrons around the atoms allows bonds to form.
B) The atomic orbitals overlap and electrons are shared between the atoms
forming bonds.
C) A transfer of electrons forms ions which are electrostatically attracted
forming bonds.
D) Orbital exchange occurs between the atoms to redistribute the electrons and
form bonds.
The electron
movement related to covalent bonding in ammonia, NH3 is The atomic orbitals overlap and electrons are shared between the atoms
forming bonds. The answer is letter B.
Answer:
There are 10 types
Explanation:
Cytokines are the molecules produced by the immune cells involved in the immune response like the B cells, T cells, macrophages and other cells.
They are produced as a means of communication between the immune cells which could act as a signalling molecule. The chemical nature of these cytokines is that they are either the proteins or the glycoproteins.
There are many types of cytokine produced in response to antigens which could be interleukin, interferon which could play a different role.
These cytokines are present in more than 10 types of forms therefore the selected option is correct.
