The organism in the accompanying figure is a representative of the:a
phylum Hemichordata.
b. phylum Echinodermata.
c. phylum Chordata.
d. subphylum Urochordata.
e. subphylum Cephalochordata.
c
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The site on an enzyme that is designated for the substrate bind is called the ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about phloem and xylem is true?
a. Both are driven by transpiration. b. Both have companion cells assisting the process. c. Both move fluids down or up plant stems. d. Both move sugars.
Which procedure is most useful in quantifying the active transcription of botulism toxin genes in a can of food that is contaminated?
A. DNA hybridization B. End-point PCR C. Real-time PCR D. Southern blot
Which of the lakes in Figure 56-2 may experience turnover?
a. 2 and 4
b. 2 and 3
c. 3 and 4
d. 1 and 2
e. 1 and 3