Adjacent plant cells utilize ____ to rapidly communicate with each other
a. gap junctions
b. plasmodesmata
c. transport proteins
d. desmosomes
e. neurotransmitters
ANSWER: b
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If oxygen is unavailable, predict what happens to the citric acid cycle
A. It stops because the supplies of NAD+ and FAD become depleted. B. It stops because ADP levels increase in the absence of oxygen. C. It continues because none of the reactions in the citric acid cycle require oxygen. D. It continues because ATP levels are low, and low ATP activates enzymes of the cycle.
The human body requires about ____ of fat
each day to stay healthy.
a. 1 teaspoon b. 4 teaspoons c. 1 tablespoon d. 4 tablespoons e. 1 cup
Some methanogenic Archaea are capable of fixing nitrogen.
Answer the following statement true (T) or false (F)
Which nutritional category do animals and most pathogenic bacteria fall into?
a. chemoheterotrophs b. chemoautotrophs c. photoautotrophs d. photoheterotrophs