Which molecule represents one of the best examples of a commonly shared signaling pathway connected to memory
in invertebrates and vertebrates?
a. cyclic AMP
b. cyclic GMP
c. RNA cyclase
d. RNA binding protein
e. non-responsive binding protein
ANSWER: a
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When two or more species vie for the same limited resource, _____ occurs.
A. succession B. symbiosis C. coevolution D. stotting E. competition
In a certain bacterial gene, transcription fails to initiate properly. What is a possible explanation?
a) DNA has not properly unwound from histones. b) The is a mutation in the inverted repeat sequence so that a hairpin can not form. c) There is a mutation at the Pribnow box at the -10 upstream location. d) There is a mutation at the Pribnow box at the -35 upstream location. e) TATA-binding protein (TBP) has not been added yet.
The phylum that includes snails, clams, oysters, and octopuses is the
A. Mollusca. B. Annelida. C. Phoronida. D. Brachiopoda. E. Ectoprocta.
One feature that phloem cells have that xylem cells lack is:
A. water potential B. cell walls C. plasmodesmata D. membranes E. cytosol