Many animals have a mutually-beneficial, symbiotic relationship with bacteria that reside in their guts. To study the effects of these relationships in more detail, research organisms such as fish and mice have been raised under germ-free conditions. What important process do you predict is compromised in germ-free mice?
A. Vitamin C synthesis
B. Leptin synthesis
C. Vitamin D synthesis
D. Vitamin K synthesis
E. Synthesis of essential amino acids
Answer: D
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Which of the following is an oral agent used for treating dermatophytoses?
A. Chloroquine B. Itraconazole C. AZT D. Bacitracin
Uterine contractions ____
a. often occur during the second trimester b. are controlled by negative feedback c. are controlled by positive feedback d. are stimulated by the hormone prolactin e. only occur during the first two stages of labor
What is chemical digestion?
A. The use of physical actions to break down food B. The absorption of food in the small intestine C. The use of villi to break down food D. The breakdown of food by enzymes
Which of the following describes what is currently known about Ctenophore symmetry?
A. Ctenophores are lacking symmetry. B. Ctenophores are possibly triploblasts because of muscle cells derived from mesoderm. C. Ctenophores are diploblasts with bilateral symmetry. D. Ctenophores are bilaterians.