Phage T4 protects its DNA from cleavage by host restriction enzymes by ________.
A. substituting glucosylated hydroxymethylcytosine for cytosine
B. replicating very rapidly
C. inactivating restriction enzymes
D. methylating bases
Answer: A
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You are a brilliant graduate student and you are skeptical of the results found by the Lederbergs. You decide to repeat their experiment, but you do not have ready access to T1 bacteriophage. What might you use instead?
A. HIV (human immuno deficiency virus) B. HPV (human papilloma virus) C. EMS, a chemical mutagen D. Ampicillin, an antiobiotic that inhibits growth of bacterial cell wall E. Salmonella bacteria
Which of the following is true of phloem?
a. conducts water up the plant b. conducts mineral ions up the plant c. connects with roots d. connects with leaves e. transports plant-manufactured organic products
The main product of the carbon reactions is
A. oxygen. B. NADPH. C. carbon dioxide. D. a carbohydrate. E. ATP.
In eukaryotic cells, the electron transport chain occurs in the
What will be an ideal response?