When adenylyl cyclase is activated ________
A) cAMP is created
B) cAMP is destroyed
C) G proteins bind to cAMP
D) steroid hormones pass through the lipid bilayer
Answer: A
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Which of the following is not a common posttranscriptional modification of tRNA molecules?
A. removal of nucleotides from the 5' and 3' ends B. methylation and deamination of specific bases C. addition of a 5' cap D. attachment of the C-5 of uracil to the ribose at specific sequences
A fire devastates all trees in a wide swath of forest. Populations of a species of tree-dwelling frog on either side of the burned area diverge to become separate species. This is an example of _____
Fill in the blank(s) with correct word
If the size of a cell doubles what will be the
surface area to volume ratio?
a. 8 to 4 b. 4 to 8 c. 16 to 4 d. 16 to 8 e. 64 to 16
Which of the following explains what happens to the circulatory system during hyperventilation?
a) oxygen levels increase, causing an increase in blood pH b) Oxygen levels decrease, causing a decrease in blood pH c) Carbon dioxide levels decrease, causing an increase in blood pH d) Carbon dioxide levels increase, causing a decrease in blood pH