The relationship between lactic acid and pyruvic acid is that
A. lactic acid is formed only in milk.
B. lactic acid is formed from pyruvic acid in fermentation.
C. one has phosphate and the other doesn't.
D. one is twice as big (6 carbons) as the other (3 carbons).
B. lactic acid is formed from pyruvic acid in fermentation.
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In mycorrhizal mutualisms between plants roots and fungi,
A) the plant supplies carbohydrates to the fungus and the fungus supplies phosphorus and nitrogen to the plant. B) the plant supplies water to the fungus and the fungus supplies essential amino acids to the plant. C) the plant protects the fungus from predation and the fungus supplies carbohydrates to the plant. D) the fungus infects the plant roots, stimulating plant growth through myc factors that act as growth hormones in the plant.
Which of the following statements is true regarding bacteria?
A. Like many eukaryotes, bacteria species can be described by the biological species concept. B. The majority of bacteria species have already been cultured. C. Bacteria can influence and alter the behavior of eukaryotes. D. Soil "genome surveys" cannot be used to identify new bacteria species. E. Many groups of bacteria include methanogenic organisms.
Homing endonucleases:
A. are encoded by sequences in the exons of genes. B. cleave specific sequences in the target gene to which the intron is moving. C. have cleavage sites that are common in the genome. D. make single-strand breaks. E. All of the choices given make true statements.
What is the source of energy for the synthesis of organic molecules in a photoautotroph?
A. heat B. other organic compounds C. carbon dioxide D. inorganic compounds E. light