In a 32-cell stage tunicate embryo, vegetal marginal cells that lack functional genes for both macho-1 and the FGF receptor would develop as what cell type?
A. muscle
B. mesenchyme
C. nerve cord
D. notochord
Answer: C
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What is the order of action of these classes of genes during Drosophila development?
A) maternal effect, gap, pair rule, segment polarity B) maternal effect, gap, segment polarity, pair rule C) maternal effect, pair rule, segment polarity, gap D) maternal effect, segment polarity, gap, pair rule
The nucleases (enzymes that hydrolyzes DNA) are considered virulence factor because:
A. They attack the DNA of the host cells B. They attack the DNA of the normal bacteria flora of the host C. They destroy the Neutrophils Extracellular Traps D. They destroy the DNA of the neutrophils E. They destroy the DNA of the macrophages
In 2006, scientists discovered a fossil that had scales and gills, a flat head with eyes on top like a frog, and fin and neck bones that would allow it to prop itself out of the water. The best explanation for this fossil is that it is
A. a modern amphibian. B. a transitional fossil between fish and amphibians. C. a ray-finned fish. D. a transitional fossil between amphibians and reptiles.
Suppose a researcher is interested in using the CRISPR-Cas9 system to knock out the phosphofructokinase gene of a rat skin cell that codes for an enzyme that is critical for glycolysis to occur. The researcher added the Cas9 enzyme to the cell but forgot
to add the guide RNA. What result do you think the researcher will observe? A) Glycolysis will proceed normally in the cell. B) The phosphofructokinase enzyme will be expressed but will have lower activity. C) Cas9 will specifically cut the phosphofructokinase gene. D) There will be mutations in the phosphofructokinase gene.