Which of the following is a source of human-fixed nitrogen?
I) industrially produced fertilizers
II) cultivation of soybeans
III) irrigation agriculture
A) only I
B) only II
C) only III
D) only II and III
E) only I and II
Answer: E
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What neurons in the nervous system integrate information?
a. interneurons b. motor neurons c. sensory neurons d. motor and sensory neurons e. interneurons and sensory neurons
If individuals exhibiting a dominant phenotype are crossed and produce only offspring with the dominant phenotype, which of the following could be the genotype of the parents?
A. Two of the options may be correct. B. Both are homozygous recessive. C. Both are homozygous dominant. D. Both are heterozygous. E. One is heterozygous and one is homozygous dominant.
A phosphate group is transferred from an organic compound to ADP during
A) oxidative phosphorylation. B) substrate-level phosphorylation. C) beta-oxidation. D) photophosphorylation. E) anabolic reactions.
You wish to produce a human enzyme, protein A, by introducing its gene into bacteria. The genetically engineered bacteria make large amounts of protein A, but it is in the form of an insoluble aggregate with no enzymatic activity
Which of the following procedures might help you to obtain soluble, enzymatically active protein? Select all options that may be useful. Explain your reasoning. A. Make the bacteria synthesize protein A in smaller amounts. B. Dissolve the protein aggregate in urea, then dilute the solution and gradually remove the urea. C. Treat the insoluble aggregate with a protease. D. Make the bacteria overproduce chaperone proteins in addition to protein A. E. Heat the protein aggregate to denature all proteins, then cool the mixture.