The Daily Item, Sunbury, PA

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December 1, 2012

Keystone biology: Are you smarter than an 11th-grader?

Pass the test and graduate from high school!

(Continued)

3. Which statement best compares the energy transformations of photosynthesis and cellular respiration?

A. Only photosynthesis uses oxygen to create energy.

B. Only photosynthesis causes an increase in kinetic energy.

C. Photosynthesis and cellular respiration both store energy in chemical bonds.

D. Photosynthesis and cellular respiration both require chemical energy to make food.

A. Photosynthesis uses the energy from sunlight to convert carbon dioxide and water into sugars and oxygen.

B. Photosynthesis causes electromagnetic energy from sunlight to be transformed into chemical energy in sugars.

C. ANSWER: Both photosynthesis and cellular respiration store energy within the bonds of sugar and/or ATP molecules.

D. Photosynthesis uses energy from sunlight to produce sugars.

4. Which type of organic molecule was most likely formed by the scientist in the laboratory?

A. lipid

B. protein

C. nucleic acid

D. carbohydrate

A. ANSWER: Most lipid molecules have long hydrocarbon chains as the main component of their structures.

The molecule described has a long hydrocarbon chain with a phosphate group, which is a phospholipid.

B. Protein molecules are made of amino acids.

C. Nucleic acid molecules are made of nucleotides.

D. Carbohydrate molecules are made of carbon, oxygen, and hydrogen atoms in a specific ratio.

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