Members of the phylum ____ are called acorn worms. They use their mucus-coated proboscis to
construct U-shaped burrows to trap food particles, and also trap food from water passed through gill
slits in their pharynx.
a. Hemichordata
b. Echinodermata
c. Cnidaria
d. Arthropoda
e. Chordata
A
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The site on the DNA to which a repressor protein binds is the ________.
A. regulator B. operator C. operon D. promoter
In which of the following taxa does the mature sporophyte depend completely on the gametophyte for nutrition?
A) fern B) bryophyte C) horsetail (Equisetum) D) A and C E) A, B, and C
Which of the following describes the Lac operon in E. coli when both lactose and glucose are present in the culture medium?
A. The Lac repressor, but not CAP, is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. B. Neither CAP nor the Lac repressor is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. C. CAP and the Lac repressor are both bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. D. CAP binds to the Lac repressor, preventing it from binding to the Lac operon's regulatory DNA, and the Lac operon is expressed. E. CAP, but not the Lac repressor, is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed.
Yeasts are members of which of the following?
A. Ascomycetes B. Basidiomycetes C. Glomeromycetes D. Chytrids E. Zygomycetes