Small, fishlike marine chordates, pointed at both ends with no distinguishable head, in which the notochord runs the entire length of the nerve cord, are called  

A.  arrow worms.
B.  tunicates.
C.  acorn worms.
D.  lancelets.
E.  lampreys.


D.  lancelets.

Biology & Microbiology

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a. estrogen receptor b. BRCA1 c. estrogen diethylstilbestrol d. BRCA2 e. progestin receptor

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A persistent pathogen can evade the host immune system by

A. evolving changes in its envelope structure. B. disrupting complement function. C. producing toxins that inhibit phagocyte movement. D. disrupting immune signaling. E. slowing down its replication.

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This organelle acts as a digestive organelle and may also be used to recycle the internal components of a cell.

a. ribosome b. lysosome c. peroxisome d. Golgi apparatus

Biology & Microbiology

Balantidium coli uses ________ to penetrate the intestinal mucosa

A) adhesion discs B) flagella C) cilia D) pseudopodia E) suckers

Biology & Microbiology