Which of the following is NOT a unique characteristic of chordates at some time in their life history?

Select one:
a. a dorsal notochord
b. a ventral hollow nerve cord
c. pharyngeal pouches
d. gill clefts
e. a postanal tail


d. gill clefts

Biology & Microbiology

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The types of bonds found in nucleic acids are: 

A. phosphodiester bonds. B. peptide bonds. C. ionic bonds. D. non-polar covalent bonds.

Biology & Microbiology

Sodium has 11 electrons arranged in three energy levels. In order to become stable, sodium forms an ion with:

A. no charge. B. -1 charge. C. +8 charge. D. +1 charge. E. -8 charge.

Biology & Microbiology

The most common etiologic agent of septic arthritis accounting for approximately 70% of infections is:

a. Streptococcus pyogenes. b. H. influenzae. c. S. aureus. d. Streptococcus mitis.

Biology & Microbiology

Which of the following mechanisms are causal explanations for bird song?

A. Young males learned their song from their fathers. B. Songs are used by males to attract a mate. C. The ritualization of the vocalization became species specific. D. Air passing through a bird's specialized singing organ, the syrinx, vibrates the surrounding organs.

Biology & Microbiology