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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

Urine flows from the ureters directly into the urethra

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

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

Biology & Microbiology