The ___ Echinoderm lineage is made up of sea cucumbers, which are elongated along their oral-aboral axis and have a
well-developed circulatory system.
a. Echinoidea
b. Ophiuroidea
c. Crinoidea
d. Holothuroidea
e. Asteroidea
ANSWER: d
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Purines and pyrimidines are precursors for synthesis of ________.
A. fatty acids B. peptidoglycan C. nucleic acids D. proteins
What step of inflammation is caused by histamine released from mast cells?
A) Macrophages engulf debris and foreign matter. B) Additional leukocytes are recruited to the region. C) Infection is cleared by phagocytosis. D) Foreign matter is contained. E) Capillaries dilate and become more permeable
The indicator(s) in the Bile Esculin Agar is (are)
A. Bile salts only B. Esculin C. Esculetin D. Ferric citrate E. Bile salts & esculin
A strain of Neisseria gonorrhea has a mutation which has caused it to lose the ability to produce fimbriae and become less virulent as a consequence. What function has this pathogen lost?
A) the ability to adhere to cells of the body B) the ability to move from one location in the body to another C) the ability to produce an endotoxin D) the ability to establish a latent infection E) the ability to prevent phagocytes killing it