Single-copy replication control means that
a. only one DNA molecule can be present in a cell at a time.
b. there can be only one origin of replication in the entire genome.
c. only one DNA molecule can be replicated in a cell at a time.
d. a DNA molecule can only be replicated once during the cell cycle.
e. there can be only one origin of replication on each DNA molecule.
Ans: d
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Pasteurization
A. is the use of heat to sterilize food products. B. is the use of heat to reduce numbers of pathogenic/spoilage bacteria in a food item to a safe level. C. is a process that uses intense cold to kill microorganisms on foods. D. is a process that uses short bursts of radiation to kill microorganisms on foods.
Nitrogen is released into the atmosphere by
a. nitrogen fixation. b. denitrification. c. nitrification. d. ammonification. e. decomposition.
What are the most important transformers of energy in ecosystems?
A. Secondary consumers B. Bacteria C. Detritivores D. Plants and algae E. Primary consumers
Challenges in developing effective antiviral drugs with minimal side effects to the patient include
A) only the attachment stage of the viral life cycle is a suitable target for antiviral drug action. B) viruses have many more chemically distinct targets than living pathogens. C) the immune system is rarely successful in ending viral infections so there is no natural model to work from. D) viruses use the cell's own machinery and metabolism for replication. E) drugs can be easily delivered to reach viruses within host cells.