A theta (?) structure is characteristic of
a. a circular replicon in the middle of replication.
b. a replication bubble at the end of a linear chromosome.
c. a replication fork.
d. the concatenated replication products of a circular replicon.
e. a replication bubble in the middle of a linear chromosome.
Ans: a
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Glycolysis is a metabolic process that is done by all cells. However, not all cells make use of another metabolic process called the Krebs cycle. What does this tell you about the evolution of these processes?
A. As a metabolic process, glycolysis likely evolved prior to the Krebs cycle B. As a metabolic process, the Krebs cycle likely evolved prior to glycolysis C. Both the Krebs cycle and glycolysis likely evolved at the same time Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about evolution and time? What other information is related to the question? Choose Answer Do you have all necessary information to determine the relative importance of glycolysis and the Kreb’s cycle? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
When an enzyme-catalyzed reaction reaches equilibrium ____
a. the enzymes are now inhibited b. the chemical reactions cease c. the rate of the forward and reverse reactions are equal d. the concentration of reactants equals the concentration of products e. ATP is no longer required to drive the reaction
The emergent property of “life” appears at the level of the ____, when many molecules become organized
a. population b. atom c. organism d. cell e. community
Explain how the trp operon is regulated in a prokaryotic cell when tryptophan is present.
What will be an ideal response?