Which structure is not a major diagnostic feature of the chordates?

a. dorsal hollow nerve cord.
b. notochord.
c. pharyngeal gill slits.
d. vertebral column.


d

Biology & Microbiology

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Four of the five answers listed below are cofactors or coenzymes. Select the exception

a. mineral b. water soluble vitamin c. metallic ions d. NAD+ e. protein

Biology & Microbiology

What cytokine stimulates plasma cells to secrete IgA?

A) interleukin-5 B) interleukin-10 C) interleukin-4 D) interferon-gamma E) interferon-alpha

Biology & Microbiology

Explain why a food web gives a better picture of a community than does a food chain

What will be an ideal response?

Biology & Microbiology

Mad cow disease is an example of an infection caused by a:

a. bacterium. b. bacteriophage. c. retrovirus. d. viroid. e. prion.

Biology & Microbiology