The mRNA that would most likely have the longest half-life would:
A. containan exon junction complex bound downstream of a stop codon.
B. lack a stop codon.
C. containan AU-rich element in the 3'-UTR.
D. containone or more hairpin structures.
D
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When a Bacillus anthracis population suddenly must form spores to survive a harsh nutrient poor environment, how do the cells obtain energy?
A) Cells in a growth phase that have not used up all of their energy will be the only ones to make endospores, which is why relatively few endospores are often made from a large population. B) Intracellular energy reserves are quickly made available to produce endospores. C) Slow responding cells are cannibalized by others that already began spore formation. D) Global regulation is initiated to minimize energy waste in biosynthetic pathways and catabolic pathways are increased to consume remaining usable substrates to fuel spore formation.
In the study of genetics, the offspring of the parental generation is referred to as the
A. P generation. B. F1 generation. C. wild-type generation. D. homologous generation. E. F2 generation.
Female secondary sexual traits, such as functional breasts and fat deposits around the hips and thighs, are determined
by _____.
a. the presence of the master gene, SRY b. increased concentration of gene products from the two X chromosomes c. absence of gene products from the Y chromosome d. sex hormones e. maternal influence
Which of the following is not evidence for the endosymbiotic theory?
A) Chloroplasts and mitochondria contain ribosomes that resemble prokaryotic ribosomes. B) Chloroplasts and mitochondria contain their own DNA that resembles prokaryotic DNA. C) Chloroplasts and mitochondria have structures that resemble prokaryotic cell walls. D) Chloroplasts and mitochondria reproduce using binary fission, like prokaryotic cells.