In rhizarians, the ________ extend through a calcium carbonate or silica shell
Fill in the blank(s) with correct word
pseudopods
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A BLAST search can be used for which of these applications?
A) to compare a nucleotide or amino acid sequence to databases from a variety of species B) to display the reading frame of a nucleotide sequence C) to determine whether a gene has an essential function in an organism D) to analyze microarray data E) to visualize the locations of all the genes on a single chromosome
Figure 7.6 from your text, shown below, is a set of histograms showing the frequency of different color patterns of water snakes of Lake Erie (Nerodia sipedon)
Type A snakes are unbanded, Type B are strongly banded, and Types C and D are intermediates. Given that natural selection favors unbanded snakes on the islands, how can you account for the presence/perpetuation of banded snakes on the islands? A) Mutation rates converting unbanded alleles to a banded form operate at high frequencies on islands. B) Natural selection favors unbanded snakes on the mainland. C) Snakes on the islands represent a case of the so-called founder effect. D) Natural selection favors banded snakes on the mainland, which occasionally migrate to the islands.
Prokaryotic transcription begins when RNA polymerase binds to which site of the gene region?
A) -35 B) -10 C) +1 D) +10 E) +35
When is the length of day always the greatest?
A) during the September equinox B) during the March equinox C) during the winter solstice D) during the summer solstice