The carbon cycle is based on carbon dioxide. CO2 makes up about
A. 3% of the atmosphere.
B. 0.03% of the atmosphere.
C. 0.3% of the atmosphere.
D. 0.003% of the atmosphere.
E. 30% of the atmosphere.
Answer: B
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The precipitation of soluble iron ions into solid iron occurs spontaneously in the presence of organic carbon compounds
Indicate whether the statement is true or false.
__________ is an anticoagulant used by leeches
A. Chitin B. Calcium carbonate C. Hirudin D. Pheromone E. Saxitoxin
The chemical reaction that converts nutrients into specific molecules required by the organism to support its cells and cell activities is
A. nutrition. B. integration. C. assimilation. D. responsiveness.
Virulent and temperate phages differ in that ________.
A. virulent phages always result in the lysis of the host cell, whereas temperate phages may lyse the host cell, or they can enter a lysogenic cycle whereby they integrate their genome into the genome of the host cell B. temperate phages integrate their genome into that of the host cell, causing uncontrolled growth and ultimately lysis of the cell, whereas virulent phages remain in the lysogenic phase indefinitely C. temperate phages always result in the lysis of the host cell, whereas virulent phages may lyse the host cell, or they can enter a lysogenic cycle whereby they integrate their genome into the genome of the host cell D. virulent phages cause mutations in the host cell genome, whereas temperate phages have no genetic effect on the host cell