28) Which one of the following is TRUE regarding electrons, shells, and energy? A) Electrons are located in shells around the nucleus. B) Electrons are attracted to each other because they have the same charge. C) In order for an electron to move closer to the nucleus, it must absorb energy. D) The innermost electron shell has the most potential energy.

Solve the problem. A ladder is resting against a wall.  The top of the ladder touches the wall at a height of 9 ft.  Find the length of the ladder if the length is 3 ft more than its distance from the wall.

34) Most eukaryotic cells have a membrane-bound ________ that contains the genetic material. A) nucleus B) cytoplasm C) lysosome D) plasma membrane

What will the price of a ton of rice be in the long run? 

Solve the problem. Martha can rake the leaves in her yard in 4 hours.  Her brother can do the job in 2 hours.  How long will it take them to do the job working together?

40) Which type of microscope provides tremendous (100,000-fold) magnification and enables viewing of fine internal structural details of cells? A) light microscope B) scanning electron microscope C) transmission electron microscope

Encountering a word not immediately recognized, the students says “v-e-t- vet” What process is this student using to decode?

About what percentage of U.S. students are estimated to have attention deficit disorder (ADD)? 

Solve the equation. 3x+53-5xx-3=x{“version”:”1.1″,”math”:”3x+53-5xx-3=x”}

22) Which one of the following statements is TRUE regarding the structure of the atom? A) The nucleus is composed of equal numbers of positively charged particles and negatively charged particles. B) All electrons are located at the same distance from the nucleus. C) In small elements, such as carbon, electrons have a positive charge; in larger elements, such as barium, electrons have a negative charge. D) Most of the mass of an atom is due to its protons and neutrons.