Choose the two primary factors that contribute to the resting membrane potential of a neuron.
_____ K+ leak channels make the cell membrane more permeable to K+.
_____ The sodium-potassium pump exports 3 K+ from the cell for every 2 Na+ it imports
_____ Na+ leak channels make the cell membrane more permeable to Na+.
_____ K+ leak channels cause a higher concentration of K+ outside the cell.
_____ The sodium-potassium pump exports 3 Na+ from the cell for every 2 K+ it imports
__X__ K+ leak channels make the cell membrane more permeable to K+.
_____ The sodium-potassium pump exports 3 K+ from the cell for every 2 Na+ it imports
_____ Na+ leak channels make the cell membrane more permeable to Na+.
_____ K+ leak channels cause a higher concentration of K+ outside the cell.
__X__ The sodium-potassium pump exports 3 Na+ from the cell for every 2 K+ it imports
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For six molecules of carbon dioxide fixed in
the light-independent reaction, how many molecules of PGA are produced?
a. 2 b. 4 c. 6 d. 12 e. 18
Prescription drugs such as Prozac help maintain higher levels of serotonin in the brain. What effect will this have on an individual?
A) It will act as an antidepressant because a lack of serotonin is considered a cause of depression symptoms. B) It will act to suppress impulsive behavior because too much serotonin causes children to act out. C) It will cause a patient to be sleepy because serotonin is essential to a good night's sleep. D) It will cause tetany due to an overproduction of acetylcholine.
Urine flows from the ureters directly into the urethra
____________________ Indicate whether the statement is true or false.
Post-translational modifications of proteins may include the _____
A) removal of introns B) addition of a 5' cap C) addition of a poly-A tail D) addition of carbohydrates to form a glycoprotein