Which characteristic differentiates hagfishes from other craniates?
A) Bony jaws
B) Lobe-like fins
C) Two-chambered hearts
D) A lack of gills
E) Skeletal elements surrounding the nerve cord
E
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Which one of the following, if missing, would usually prevent translation from starting?
A) exon B) cap C) AUG codon D) poly-A tail
What structure is responsible for the exchange of gas in leaves?
a. Aerenchyme b. Propagule c. Lenticels d. Stomata
Peptides and small proteins are generally too large to be transported into cells using transport proteins or by moving through pores. The macromolecules are brought into the cell using
A) diffusion. B) exocytosis. C) gated channels. D) endocytosis. E) open channels.
Polychaetes crawl by means of leg-like ________ which also serve in respiration.
a. Aortic arches b. Metanephridia c. Clitella d. Palps e. Parapodia