Matter and Energy Quiz

Answer each question by clicking the correct blue button. Only the first answer selected is graded.

1.  Which group of elements combine to form most of the compounds in living things?
A. carbon,hydrogen,oxygen, nitrogen.
B. carbon,hydrogen, phosphorus, nitrogen.
C. carbon, sodium, chlorine, oxygen.
D. carbon,sulfur,phosphorus,oxygen.

2.  Of the following organic compounds, which ones store genetic information?
A. lipids.
B. proteins.
C. nucleic acids.
D. carbohydrates.

3.  Solar energy is a type of kinetic energy (the energy of motion). Photosynthetic organisms like plants store this energy in the form of:
A. heat.
B. chemical bonds of organic compounds.
C. mechanical energy.
D. radiation.

4.  Cells use their stored energy for which of the following?
A. movement.
B. growth or cell division.
C. response to stimuli.
D. all of the above

5.  Which organisms below serve to break organic compounds into simpler substances and return them to the soil and water?
A. bacteria and fungi.
B. carnivores.
C. herbivores.
D. producers.

6.  The reason nitrogen fixation by bacteria is so important is because:
A. Plants produce too much nitrogen.
B. Without nitrogen fixation, atmospheric nitrogen would be changed to carbon dioxide.
C. Very few organisms can use the gaseous nitrogen found in the atmosphere.
D. Decomposition of proteins releases ammonia that can be converted to nitrogen and hydrogen by bacteria.


Grade exam.