Three hypothetical phosphorylated compounds (A, B, and C) are involved in energy metabolism. Standard free energies of hydrolysis for A = 13.1 kcal/mol, for B = -2.7 kcal/mol, and for C = 6.7 kcal/mol. What is the sequence in which these molecules could most exergonically phosphorylate?
A) A, B, C
B) A, C, B
C) B, C, A
D) C, B, A
E) C followed by A or B
B) A, C, B
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O2 is transported from air in the lungs into the blood through the process of ____
a. active transport b. simple diffusion c. facilitated diffusion d. osmosis e. active transport
Biochemistry is based on the chemistry of which element?
a. hydrogen b. oxygen c. carbon d. sulfur
The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. allows for comparison to the experimental group.
Some of the "branches" of a phylogenetic tree do not extend to the end. What do these lines represent?
A) Extinct species B) Species of unknown origin C) Convergent species D) Lineages that have not changed