Mehran has heard from some of his team-mates that drinking a high protein supplement after football training will improve his muscle mass. He decides to test this hypothesis by examining the effect of a high protein drink on some of his team-mates compared with what happens with a control group who drink only water. Which of the following would be the best control for his experiment?
a) randomly selected team-mates who are given only small amounts of a protein drink.
b) randomly selected team-mates who are given a placebo instead of a protein drink.
c) volunteers from the general campus population who are not given any protein drink.
d) volunteers from the general campus population who begin football training and are given a protein drink.
e) volunteers from the football team who agree to take a placebo instead of a protein drink.

B, Randomly selected teammates in training who are given a placebo instead of a protein drink.

Explanation:

Placebo has a beneficial effect produced by a placebo drug or treatment, which cannot be attributed to the properties of the placebo itself, and must therefore be due to the patient's belief in that treatment.These person's given Placebo will tend to improve their muscle mass. Comparing yourself with them would tends to show you which opinion is more viable.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

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the answer you are looking for is the united states forest service.

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