Gases such as nitrous oxide and carbon dioxide are called greenhouse gases because they
A) block sunlight from reaching Earth.
B) block specific wavelengths of sunlight from penetrating.
C) permit sunlight to enter but trap the heat energy in the atmosphere.
D) block both sunlight and heat energy from penetrating the atmosphere.
E) stimulate photosynthesis in most plants.
C
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do nitrogen-fixation nodules contain large amounts of leghemoglobin?
A. It helps transport oxygen to the bacteria. B. The nitrogenase enzyme interacts with the iron in the leghemoglobin. C. The leghemoglobin helps break the triple bond of N2. D. It stimulates the Nod factors. E. It prevents carbon dioxide from inhibiting the nitrogenase enzyme.
Although Sulfolobus solfataricus grows at pH 2 to 4, it maintains a cytoplasmic pH of about 2, thereby generating a large pH gradient across the plasma membrane.
Answer the following statement true (T) or false (F)
In sickle cell anemia, affected individuals carry ____
a. one of several different nucleotide substitutions b. the same single nucleotide substitution c. more than one nucleotide substitution
d. a number of mutant alleles e. one mutant allele in several genes