How does hemoglobin help to maintain the pressure gradient?
a. by duplicating oxygen
b. by carrying oxygen away from the lungs
c. by feeding oxygen into the lungs
d. by mixing oxygen with carbon dioxide
e. by binding with nitrogen
B
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Which organism is indole and gelatin positive but does not have the ability to oxidize mannitol?
a. S. multivorum b. CDC group O-1 c. E. brevis d. E. meningoseptica
Anatomical traits are shaped by ____ constraints such as the requirement that a large body cannot evolve without evolution of a circulatory system to distribute material through it
a. evolutionary b. physiological c. chemical d. physical e. cellular
Root structures that grow around and encapsulate mutualistic nitrogen-fixing bacteria are called ____
a. hyphae b. mycorrhizae c. Casparian strip d. root hairs e. root nodules
What are the protobionts produced by abiotically produced polypeptides?
a. polybionts b. prokaryotes c. microspheres d. peptidebionts e. stromatolites