Archaeans like Sulfolobus have multiple origins of replication. This suggests that they
a. in this regard, are more like bacteria than eukaryotes.
b. in this regard, are more like eukaryotes than bacteria.
c. have a unique form of chromosomal replication.
d. have multiple plasmids, whose replication must be coordinated.
e. have multiple chromosomes.
B
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Bread mold can grow in a minimal medium without supplements (wild type) while certain mutated strains (mutants) can only grow in a minimal medium that is supplemented with specific intermediates found in the following metabolic pathway for arginine synthesis:
minimal ------> ornithine -------> citrulline ------> arginine, where enzyme 1 converts the precursor to ornithine, enzyme 2 converts ornithine to citrulline, and enzyme 3 converts citrulline to arginine. Which of the following would be TRUE of a strain that can grow in minimal medium containing ornithine, citrulline, or arginine, but not in minimal medium alone? A. The strain would have a mutation in the gene that encodes enzyme 1. B. The strain would have a mutation in the gene that encodes enzyme 2. C. The strain would have a mutation in the gene that encodes enzyme 3. D. The strain would have a mutation in the gene that encodes for enzymes 1, 2, and 3. E. The strain would be the wild type with no genetic mutations.
Studies have determined that all of the following except ______ are responsible for the cyclical rise
and fall of arctic hare and lynx populations.
a. predation b. a limited food supply for hares c. predation by other mammals d. intraspecies competition e. disease
Why are infections caused by viruses so much more difficult to treat or cure than those caused by bacteria?
What will be an ideal response?
In immunoglobulin genes, how are V and J gene segments prevented from being recombined with another segment from the same gene?
What will be an ideal response?