The distinction between causality and correlation is best described as:
A. causality implies positive amounts of co-movement, correlation implies negative amounts of co-movement.
B. causality implies a change in one variable creates a change in another, correlation implies variables move together.
C. correlation implies a change in one variable creates a change in another, causality measures co-movement.
D. None of the answers is correct.
Answer: B
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Lichens are an important component in many ecosystems because they ____
a. are primary producers b. help form soil by breaking down rocks c. are food for primary producers d. trap small predators with their hyphae e. form a mutualistic relationship with the roots of most plants
Explain how a saturated fat is structurally different from an unsaturated fat
What will be an ideal response?
Garrod's information about the enzyme alteration resulting in alkaptonuria led to further elucidation of the same pathway in humans. Phenylketonuria (PKU) occurs when another enzyme in the pathway is altered or missing, resulting in a failure of phenylalanine (phe) to be metabolized to another amino acid: tyrosine. Tyrosine is an earlier substrate in the pathway altered in alkaptonuria. How might PKU affect the presence or absence of alkaptonuria?
A. Anyone with PKU is born with a predisposition to later alkaptonuria. B. Anyone with PKU must also have alkaptonuria. C. It would have no effect, because PKU occurs several steps away in the pathway. D. It would have no effect, because tyrosine is also available from the diet. E. Anyone with PKU has mild symptoms of alkaptonuria.
In which stage does formation of mature viruses occur?
a. Release b. Penetration c. Attachment d. Biosynthesis e. Assembly