Viagra causes dilation of blood vessels and increased blood flow to the penis, facilitating erection. Viagra acts by inhibiting _____
A) the hydrolysis of cGMP to GMP
B) the hydrolysis of GTP to GDP
C) the dephosphorylation of cGMP
D) the removal of GMP from the cell
A
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A peptidoglycan-like polymer found in the cell walls of some Archaea is called ________.
Fill in the blank(s) with the appropriate word(s).
Blood glucose levels are regulated by ____ , in which an increase or decrease in glucose signals the pancreas to stop producing glucagon or insulin (respectively)
Fill in the blank with the appropriate word.
In a certain breed of chicken, an incomplete
dominant gene controls color. The homozygous black, when crossed with the homozygous splashedwhite, produces an intermediate gray color pattern referred to as blue. A second gene controls the shape of the comb. The dominant allele (R) produces rose, whereas the recessive allele (r) produces single. Give the F1 and F2 genotypic and phenotypic ratios of a cross between a pure-breeding black single and a pure-breeding splashed-white rose. What will be an ideal response?
In the PCR technique, what bonds are broken when DNA is heated?
A. Hydrogen D. Hydrogen and covalent B. Covalent E. Hydrogen, covalent, and ionic C. Ionic