If the only chordate characteristic that adult sea squirts possess are gills, why are they classified as a chordate?
What will be an ideal response?
Answers may vary. It is true that adult sea squirts have only one chordate characteristic, gills. However, the sea squirt larvae are bilaterally symmetrical and have all four chordate characteristics: a notochord, a dorsal tubular nerve cord, pharyngeal pouches, and a postanal tail.
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Which of the following is a sulfide?
A) H2S B) HS- C) S2- D) H2S, HS-, and S2- are all sulfides.
Phage T4 protects its DNA from cleavage by host restriction enzymes by
A. inactivating restriction enzymes. B. replicating very rapidly. C. substituting glucosylated hydroxymethylcytosine for cytosine. D. methylating bases.
What type of organism causes tuberculosis?
What will be an ideal response?
Match the choice on the left with the correct choice on the right
A) end-product inhibition B) trypsin C) Lineweaver–Burk plot D) RNA E) zinc F) protein kinases G) distortion of substrate and enzyme 1) double-reciprocal 2) feedback inhibition 3) covalent modification 4) proteolytic cleavage 5) ribozymes 6) prosthetic group 7) induced-fit model