2. Indicate whether the sentence is true or false. If false, cross out the incor

Question

2. Indicate whether the sentence is true or false. If false, cross out the incorrect word or phrase in the sentence and write the correct word on top of the incorrect word. (2 points each; total = 28) A. Amplitude of the action potential is largely determined by the concentration of Na+ ions outside the axon. ______________ B. Action potential is fired when the membrane is polarized. _______________ C. Inhibitory synapses work by allowing an influx of Ca2+ ions into the cell. _______________ D. During the transmission of the action potential, the channels quickly switch from the open to inactivated state. ________________ E. The Na+ -K + pump mediates a type of transport called antiport because it transports Na+ and K+ in opposite directions. ________________ F. Improperly folded membrane proteins are retained in the endoplasmic reticulum. _________________ G. New phospholipids are added to the extracellular face of the lipid bilayer. _______________ H. At the synapse, an electrical signal is converted into a chemical signal by the release of neurotransmitter. ________________ I. The electrochemical gradient is comprised of the concentration gradient and the action potential. _________________ J. ATP synthesis in the chloroplast is driven largely by the pH differential between the stroma and the thylakoid space. _________________ K. Prozac inhibits serotonin signaling in the brain. ________________ L. The carbon fixation cycle occurs in the matrix of the chloroplast. _________________ M. Oxidative phosphorylation requires the generation of a proton gradient. _______________ N. NADPH is less oxidized than NADP+ . _________________

Explanation / Answer

B) the statment is false it is caused by deploraization .

C) the statement is false as the inhibitory one is done by chloride ions not by calcium ions

E) the statement is true .

F) the statement is true..

G) the statement is true by the transporter called flippase which bring the new phospholipids to the outer membrane..

H) the statement is true..

I) true the action potential help in maintaining the sodium and potassium in the membrane making it according to the concentration gradient..

J) the statement is false as it requires the proton gradient..

M) true..

N) true oxidation means loss of hydrogen in NADPH hydrogen is present whereas in NAD+ hydrogen is lost hence more oxidised..

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