What developmental event was key to the evolution of the chordates by forming the notochord and dorsal nerve cord?
A. Gastrulation
B. Neurulation
C. Morphogenesis
D. Neural crest formation
E. Organogenesis
Answer: B
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How do the features of a larval tunicate differ from an adult tunicate? Check all that apply.
_____ Larval tunicates have a conspicuous notochord that is lost by the time they reach adulthood. _____ Larval tunicates have a hollow dorsal nerve cord that is reduced to a ganglion in adults. _____ The tail of a larval tunicate is lost by the time it transforms into an adult. _____ The pharynx of the larval tunicate becomes more prominent in the adult. _____ The larval tunicate lacks an incurrent and siphon but the adult has both structures.
Ultimately, the signal from a peptide hormone is typically conveyed to the effectors in the cell via the transfer of what molecular moiety?
A. nucleotide B. NO (nitric oxide) C. H2O D. phosphate group E. amino acid Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about peptide receptors? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
You have identified a chromosome that has both p and q arms, but notice that the p arms are composed of highly repetitive DNA. What type of chromosome is this?
A) metacentric B) submetacentric C) acrocentric D) subacrocentric E) telocentric
Alpha helices and ?-pleated sheets represent the ________ structure of a protein
A) primary B) secondary C) tertiary D) quaternary E) All of the above