In the process of fermentation, what happens to pyruvate that is produced from glycolysis?
a. It enters the mitochondria where it is reduced to lactic acid
b. It remains in the cytoplasm and is converted to ethanol in plants
c. It enters the Kreb's cycle in the mitochondria
d. It loses an electron to NAD+ to form NADH
Ans: b. It remains in the cytoplasm and is converted to ethanol in plants
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Which factor is important for maintaining the different germ cell layers in the developing embryo? [Hint: without this molecule the embryo would be a ball of cells with no distinct germ cell layers.]
A. activin B. noggin C. Spemann's organizer D. Hox gene E. cadherins
Which tissue will NOT be crushed or sloughed off
by the growing of the stem? a. vascular cambium b. epidermis c. cortex d. pith e. endodermis
Which feature is necessary for a scientific hypothesis?
A) It is able to be proven true. B) It is falsifiable. C) It is a theory about something. D) It is not based on observations.
The idea that most ecological communities do not have sharp boundaries, but rather intergrade with one another, is consistent with what concept(s) of community ecology? Check all that apply.
_____ organismic model _____ principle of species individuality _____ individualistic model _____ productivity model _____ species-area effect