6) Which of the following phrases describes the structure of the nucleus?
A.
an organelle surrounded by a double membrane
B.
a system of folded membranes that may be covered in ribosomes
C.
an organelle surrounded by a membrane and cell wall
D.
an organelle that has a folded inner membrane

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol