A difference in the number of particles in two neighboring solutions is a(n) ____________________. Fill in the blank(s) with the appropriate word(s)
ANSWER: concentration gradient
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Which of the following steps in prokaryotic translation takes place first?
A) aminoacylation of the tRNA molecule B) joining of 30S and 50S ribosomal subunits into 70S ribsomes C) binding of mRNA to a ribosome D) attachment of fMet aminoacyl tRNA E) catalysis by RNA polymerase
While walking through the forest, you discover a tree covered in shelf fungi. Although you are unable to determine whether the tree is alive, dead, or dying, you know that shelf fungi are potentially pathogenic and may already have caused significant harm to this particular tree. Nevertheless, you resist the urge to knock down these shelf fungi; why?
a. Shelf fungi also cause warts in humans when touched or inhaled.
b. It would release spores that would infect all of the other trees in the area.
c. The shelf fungi will return valuable nutrients to the forest ecosystem.
d. Damaging shelf fungi causes them to redouble their metabolic rate.
The fact that a nucleic acid is a very complicated molecule suggests that
A. sophisticated enzymes were not present or available to synthesize it. B. RNA could not have arisen on its own by chance, but required enzymes to guide the synthesis of nucleotides and then nucleic acids. C. no natural system could ever generate it. D. the protein-first hypothesis is therefore the only plausible hypothesis. E. the RNA-first hypothesis is impossible.
The three particles that make up an atom are
a) protons, neutrons, and isotopes b) neutrons, isotopes and electrons c) positive, negatives, and electrons d) protons, neutrons, and electrons