Which of the following is a function of a poly-A signal sequence?
A. It is a sequence that codes for the hydrolysis of the RNA polymerase.
B. It adds a 7-methylguanosine cap to the 3' end of the mRNA.
C. It codes for a sequence in eukaryotic transcripts that signals enzymatic cleavage ~10-35 nucleotides away.
D. It allows the 3' end of the mRNA to attach to the ribosome.
E. It adds the poly-A tail to the 3' end of the mRNA.
Ans: C. It codes for a sequence in eukaryotic transcripts that signals enzymatic cleavage ~10-35 nucleotides away.
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. Which biological process accounts for the oscillating pattern observed in this dataset?
A. photosynthesis B. respiration C. More information would be needed to answer this question.
The United Nations projects a stabilizing world population at
A. two billion. B. seven billion. C. ten billion. D. fourteen billion. E. None of these choices are correct.
In sponges, spicules are ____
a. fibrous skeletal proteins b. specialized digestive cells c. complicated pore openings and passageways d. needle like skeletal structures made up of silica or calcium carbonate e. feeding cells with a flagellum surrounded by a collar
TRAIT SPECIESABCDE101111200111310101401111500001610101 The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which species has the greatest number of ancestral character states (pleisiomorphies)?
A. 1 B. 2 C. 3 D. 4 E. 5