In step "b" the original strands have separated because
a. the hydrogen bonds between bases were broken.
b. the sugar-phosphate linkages broke.
c. the polymerases stopped functioning.
d. the bases repelled each other.
e. water changed the bases into their subunits.
a
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While a eukaryotic pre-mRNA is still being synthesized it is modified on its 5' end when
a. exon shuffling mixes mRNA pieces. b. enzymes recognize a polyadenylation signal in the trailing RNA sequence. c. the RNA introns are cut out by the spliceosome. d. an enzyme adds a guanine-containing cap. e. the RNA exons are spliced together.
A scientist is examining motile protist. He wishes to determine their direction of movement. Which of the following microscopic techniques is least likely to be used to view these cells?
A) light microscopy B) electron microscopy C) differential interference contrast microscopy D) fluorescence microscopy E) phase-contrast microscopy
When Louis Kunkel discovered the gene associated with Duchenne's Muscular Dystrophy in the 1980s, he then
needed to determine _____. a. the MIM number of the gene b. whether the gene was linked to blood type c. how the mutant gene produces the disease phenotype d. whether to use positional cloning to clone the gene e. how many copy number variants were present in the gene
Two types of eyes that evolved to detect images are the:a
compound eye of vertebrates and the camera eye of arthropods. b. compound eye of arthropods and the camera eye of vertebrates. c. compound eye of vertebrates and the ocelli eye of arthropods. d. compound eye of arthropods and the ocelli eye of vertebrates. e. ocelli eye of vertebrates and the camera eye of arthropods.