In some genetically engineered tomatoes, fruit ripening was delayed by crippling the gene that produces which hormone?
A. cytokinin
B. gibberellin
C. abscisic acid
D. ethylene
E. auxin
Answer: D
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If cells are grown in a medium containing radioactive 32P-labeled phosphate, which of these molecules will be labeled?
A) proteins B) cellulose C) amino acids D) nucleic acids E) glucose
Sulfolobus grows in aquatic environments at temperatures up to ________ and a pH of ________
a. 80°C / 1–5 b. 90°C / 1–5 c. 70°C / 7–10 d. 100°C / 3–6
In evolution, gene flow and reproduction are successful only when___ offspring are produced.
What will be an ideal response?
Consider the reaction X->Y in a cell at 37°C. At equilibrium, the concentrations of X and Y are 50 ?M and 5 ?M, respectively. Use this information and the equations below to answer questions A–E
?G° = –0.616 ln Keq ?G = ?G° + 0. 616 ln [Y]/[X] Recall that the natural log of a number z will have a negative value when z< 1, positive when z> 1, and 0 when z = 1. A. What is the value of Keq for this reaction? B. Is the standard free-energy change of this reaction positive or negative? Is the reaction X->Y an energetically favorable or unfavorable reaction under standard conditions? C. What is the value of the standard free energy? Refer to Table 3–1 in the textbook or use a calculator. D. Imagine circumstances in which the concentration of X is 1000 ?M and that of Y is 1 ?M. Is conversion of X to Y favorable? Will it happen quickly? E. Imagine starting conditions in which the reaction X->Y is unfavorable, yet the cell needs to produce more Y. Describe two ways in which this may be accomplished.