The junctions between animal cells that allow the free passage of molecules smaller than approximately 1,000 daltons are called
a. tight junctions.
b. plasmodesmata.
c. gap junctions.
d. hemidesmosomes.
Ans: c. gap junctions.
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Which of these phases produces ATP?
Consider the three phases of glycolysis: (1) preparation and cleavage (Gly-1 to Gly-5) (2) oxidation (Gly-6 to Gly-7) (3) pyruvate formation (Gly-8 to Gly-10) A) 1 B) 2 C) 3 D) 1 and 2 E) 2 and 3
Cells that possess a nucleus and a membrane system that establishes internal compartments belong in which of the following groups?
A) eukaryotes B) viruses C) Archaea D) Bacteria
In the African savanna, fire helps maintain the dominant vegetation
____________________ Indicate whether the statement is true or false.