The average distance of the Sun from the Earth is about __________.
Answer(s): C
The average distance of the Sun from the Earth is about 93 million miles. The Earth's moon is about 240,000 miles from the Earth.
What is the smallest part of matter that retains the chemical properties characteristic of a particular element?
Answer(s): D
The smallest part of matter that retains the chemical properties characteristic of a particular element is an atom. Molecules are made up of two or more atoms, and electrons are particles within the atom. An isotope is one of two or more atoms of the same element that have the same atomic number (i.e., the same number of protons) but a different number of neutrons.
A gamete is a cell that __________.
A gamete is a cell that fuses with another gamete during fertilization.
The nucleus of an atom consists of __________.
Answer(s): A
The nucleus of an atom consists of protons, which have a positive electrical charge, and neutrons, which have no charge Electrons, which have a negative charge, circle the nucleus in the orbital shell.
Antibodies __________.
Antibodies identify and neutralize foreign objects inside the body. Humans and other vertebrates have an immune system that uses antibodies to fight bacteria, viruses, toxins, and other foreign objects. Antibodies are complex, Y-shaped protein molecules that develop from plasma cells, which in turn develop from "B lymphocytes" produced by the bone marrow. The plasma cells can generate a very large array of different antibodies, each of which can combine with and destroy an antigen (foreign molecule).Antibodies react to very specific characteristics of different antigens, binding them to the top ends of their Y- shaped form. Once the antibody and antigen combine, the antibodies deactivate the antigen or lead it to macrophages (a type of white blood cell) that ingest and destroy it.High counts of a particular antibody may persist for months after an invasion before eventually diminishing.However, the B cells can quickly manufacture more of the same antibody if exposure to that particular antigen reoccurs.Vaccines work by "training" B cells to recognize and react quickly to potential disease molecules.
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