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.
Answer: B
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Photoperiodism in Arabidopsis thaliana depends on which of the following factors? Select all correct choices
A. the activation of photoreceptors B. daily fluctuations of CONSTANSmRNA C. daily fluctuations of AUXIN mRNA D. the accumulation and stabilization of CONSTANS E. the accumulation and stabilization of AUXIN F. the inhibition of phytochrome
The circulation of an agent in the bloodstream is given a name ending in
A. -ase. B. -ing. C. -emia. D. -ation.
Lichens are particularly intolerant of __________
despite their tolerance for harsh environments. a. drought b. cold c. bright sunlight d. airborne pollutants e. shade
The engulfment of food particles by a heterotrophic protist cell is
What will be an ideal response?