By one hypothesis, clay _____
a. facilitated assembly of early organic polymers by concentrating monomers through it's negative charge
b. was present at hydrothermal vents
c. provided energy for early metabolism
d. has a positive charge and repelled organic monomers
e. helped physically form the plasma membrane of protocells
a
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________ (FAD) is a molecule similar to NAD+ in function, but it is a lower-energy coenzyme.
Fill in the blank(s) with the appropriate word(s).
How many nucleotides make up a codon?
A) two B) three C) four D) five
If the epithelium that lines the air sacs of your lungs were to gain a layer of cells, which of the following would likely occur to the rate of oxygen diffusion?
A) Oxygen will diffuse across the lung surface more quickly. B) Oxygen will diffuse across the lung surface more slowly. C) Oxygen will diffuse across the lung surface out of, instead of into, the body. D) Oxygen will diffuse across the lung surface at a normal rate because it is only the shape of the cells that affect diffusion rate.
What is the most effective way of killing Staphylococcus in the food you are preparing?
A) Use a good antiseptic on the food itself before preparing it. B) Cook the food thoroughly. C) Nothing; this organism never is spread in food. D) Mix antibiotics in with the food.