In the nitric oxide signaling pathway, nitric oxide activates an enzyme that can convert many molecules of GTP into molecules of cGMP. cGMP is a small molecule that can diffuse through the cytoplasm and bind to an enzyme called protein kinase G (PKG). Binding of cGMP to PKG leads to a change in the confirmation of PKG that leads to its activation. What type of signaling molecule is cGMP?
A. Scaffold
B. Adapter protein
C. Second messenger
D. Enzyme
C. Second messenger
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Which of the following statements concerning the properties of ligands for intracellular receptor systems is correct?
A) Steroids are produced from cholesterol. B) Changes in the composition of your diet can affect the concentration of some of these ligands in your body. C) Some ligands are bound to specific proteins when carried in the blood. D) both choices A and C E) choices A, B, and C
Which gamete genotypes are expected to contribute to viable offspring when an individual is heterozygous for a pericentric inversion and crossing-over occurs as shown in the diagram? (The ? symbol represents a centromere.)(Select all that apply.)
A) ? A B C D E
B) ? A B C d a ?
C) ? a d c b e
D) e b c D E
E) ? A B C d e
F) A B C ? d a
G) e b c ? D E
H) A B C ? D E
J) a d ? c b e
Some people breathe primarily through their mouth rather than their nose. Why is this practice a bad idea?
What will be an ideal response?
Scientific names of organisms consist of two English terms.
a. true b. false