The methanogens, producers of methane gas, require environments that
A. have abundant oxygen and CO2.
B. are very acidic.
C. have sunlight.
D. are extremely cold.
E. are anaerobic with hydrogen gas and CO2.
Answer: E
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Which part of the seed produces hydrolytic enzymes that break down the starchy endosperm during seed germination?
A. scutellum B. amyloplasts C. aleurone layer D. plumule E. coleorhiza
Clusters of cell bodies of neurons outside the central nervous system are known as
a. nerve cords. b. ganglia. c. a plexus. d. notochords. e. nerves.
________ is the transfer of energy from one place or form to another place or form
Fill in the blank with correct word.
What was one of the pieces of evidence most critical to the discovery of DNA structure?
A. the hydrogen bonding between different nucleotides B. its composition of four different nucleotides C. the discovery of its semi-conservative mode of replication D. the backbone containing sugar-phosphate linkages E. an X-ray diffraction pattern suggesting a double helix shape