Photosynthesis must provide a source of electrons and H+ ions because ______________
a. atmospheric CO2 must be oxidized by adding electrons
b. CO2 must be reduced to produce sugars
c. hydrogen atoms are added to oxygen to form water
d. hydrogen ions and electrons react to produce hydrogen gas
e. hydrogen ions and electrons are converted into oxygen gas
B
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The single most important physical sign of primary syphilis is
A) the chancre. B) a skin rash. C) paralysis. D) an acute eye infection.
The letter "F" in the accompanying figure represents ____
a. complement b. MHC markers with antigen expressed to the surface of a cell
c. lysosome fusing with a phagosome d. plasma membranes fusing e. MHC recycling
Which of the following statements concerning unsaturated fats is correct?
a. They are more common in animals. b. They have no double bonds in the carbon chains of their fatty acids. c. They are generally liquid at room temperature. d. They contain more hydrogen than do saturated fats having the same number of carbon atoms. e. They have fewer fatty acids per fat molecule than do saturated fats
ATP and NADPH
A) power sugar synthesis during the Calvin cycle. B) are products of the Calvin cycle. C) provide energy to photosystem I and photosystem II. D) are used in the electron transport chain to pump H+ into the thylakoid space.