Which phylum contains members that do NOT exhibit true segmentation?

a. Chordata
b. Nemertea
c. Arthropoda
d. Annelida


Answer: b. Nemertea

Biology & Microbiology

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The period following an action potential during which a neuron cannot be stimulated to generate another action potential is referred to as

A. the resting period. B. the refractory period. C. the critical period. D. the threshold period. E. the inactivation period.

Biology & Microbiology

Special molecules such as NADH and FADH2 transport ________ in cells, which can then be used as energy in the cell

Fill in the blank(s) with correct word

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Metals are cycled in the environment by microbes that (oxidize/reduce/solubilize) them.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which transcription factors are normally bound to the Psf promoter in the presence of Mg2+ only?

(a) none (b) MetA only (c) MetA and Met B (d) MetA, MetB, and MetC

Biology & Microbiology