If adenylyl cyclase were inhibited in animal cells, ____
a. binding of epinephrine to beta receptors would have no affect on cyclic AMP levels.
b. binding of epinephrine to beta receptors would increase cyclic AMP levels.
c. an increase in mRNA for cyclic AMP would occur.
d. an increase in mRNA for more beta receptors would occur.
e. epinephrine would not be able to bind to beta receptors.
ANSWER: a
You might also like to view...
Ser Thr kinases take the gamma phosphate off of ATP and covalently link it to a hydroxyl group.
a. true b. false
An increased number of patients have recently been diagnosed with celiac disease, which you may know of as gluten sensitivity (OMIM 212750)
It is a multifactorial disorder of the small intestine influenced by genes and environment, and it is characterized by malabsorption due to inflammation of the mucosa after eating wheat gluten or related proteins. It is now thought to occur in 1 out of 120 to 300 people. Genes found to be associated with it are in the HLA region of chromosome 6, namely DR3 and DQw2. Which of the following is more probable? A) It is an autoimmune disorder. B) It is caused by exposure to gluten in infancy. C) It has high broad-sense heritability. D) Its frequency varies greatly by population. E) It is found primarily in inbred populations.
Dyes are often added to growth media to aid in the identification of microbes. What could be the purpose of a dye in this case?
A) to make the plate prettier B) to color key the type of plate being used C) to act as a growth enhancer D) to act as a pH indicator
Describe the major histocompatability complex with regard to its: a) location, b) composition, c) relationship to specific cell markers, and d) role in regulation of immune reactions.
What will be an ideal response?