According to one hypothesis, clay may have
played an essential role in the formation of
complex molecules of life. How might clay
have participated in that process?
a. by attracting positively charged molecules
that became concentrated
b. by acting as an enzyme to catalyze
dehydration synthesis reactions
c. by transferring electrons from one molecule
to another
d. by acting as a template for RNA molecule
production
e. by gathering from the sun energy necessary
to power reactions of synthesis of complex
molecules
A
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In the chloroplast, cytochrome b6f is an important complex in the photosynthetic electron transport chain because it accepts electrons from photosystem II and donates them to photosystem I
Another vital function of cytochrome b6f is that during its reduction-oxidation cycle it pumps ______ from the _____. A. hydrogen ions; stroma into the thylakoid B. electrons; stroma into the thylakoid C. hydrogen ions; thylakoid into the stroma D. electrons; thylakoid into the stroma
By what method do tardigrades and nematodes grow?
a. simple expansion b. logistically c. molting and ecdysis d. They do not change size.
The fastest land animal is the cheetah, which can run about 70mph. The fact that its main prey species, the Thomson's gazelles can run about 50 mph, which is also very fast, is likely the result of ____
a. character displacement b. disruptive selection c. interference competition d. predator-prey coevolution e. mimicry
Human ears detect sounds in the range of
A. 10 to 15,000 hertz. B. 20 to 20,000 hertz. C. 25,000 to 50,000 hertz. D. 100,000 to 150,000 hertz. E. 25,000 to 250,000 hertz.