MacConkey agar is selective for Haemophilus influenzae
Indicate whether the statement is true or false
FALSE
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Which of the following methods could be used to detect the presence of viable but nonculturable cells of a pathogen in a water or food specimen?
A. Use of enrichment techniques B. Polymerase chain reaction C. Culture on selective agar D. Culture on enriched agar
Based on their experiment with T2 bacteriophages, Hershey and Chase concluded that
A. DNA replication is semiconservative. B. the phage coat contains the genetic material. C. DNA functions as the genetic material. D. A always pairs with T and G always pairs with C. E. virulent bacteria can transform nonvirulent bacteria.
Considering the age of the various segments of an annelid such as an earthworm,
a. They are born with all segments present and these merely grow in size; this allows segment count to be a major feature in their identification b. New segments are added just behind the prostomium, so the oldest segments are at the posterior end c. New segments are added just in front of the pygidium, so the oldest segments are at the anterior end d. Each segment doubles several times in life so all of the segments are half or one-fourth "new" at any one time e. Segments grow and duplicate in a haphazard fashion preventing their use in identification
What is a helix-turn-helix motif and what are the roles of helix-2 and helix-3 in recognizing DNA?
What will be an ideal response?