A phosphorus shortage in soil would make it difficult for plants to produce:
A. DNA
B. starch
C. amylose
D. cellulose
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain and what do they mean?
Gather Content
· What do you know about molecules that contain phosphorus? How does it relate to the question?
Consider Possibilities
· What other information is related to the question? Which information is most useful?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A. DNA
Clarify Question
· What is the key concept addressed by the question?
o The question asks about which biological molecules contain phosphorus.
· What type of thinking is required?
o You are being asked to apply your knowledge of the atoms found in different biological molecules to predict which could not be made by plants in a shortage of phosphorus.
· What key words does the question contain and what do they mean?
o Phosphorus shortage – a lack of phosphorus means that molecules that contain phosphorus may not be made by the plant.
Gather Content
· What do you know about molecules that contain phosphorus? How does it relate to the question?
o The primary molecules in cells that contain phosphorus are nucleic acids.
Consider Possibilities
· What other information is related to the question? Which information is most useful?
o The word carbohydrate has the roots carbo- (carbon) and hydrate (water). Carbohydrates all have the base structure CH2O repeated many times, and do not contain phosphorus.
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o DNA is deoxyribonucleic acid and contains nucleotides connected together by phosphates. The other options are all carbohydrates and do not contain phosphate.
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o This question asked you to apply the structure of different biological molecules to determine which would contain phosphate. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you realize that the carbohydrates do not contain phosphate and only contain C, H and O? Did you remember that DNA is a nucleic acid and contains phosphate?
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a. a measure of phosphorous concentration. b. a measure of hydrogen ion concentration. c. measured by counting the number of different kinds of aquatic insects. d. measured on a scale from 1 to 100