Which of the following statements are true or false? If a statement is false, explain why it is false
A. Enzymes lower the free energy released by the reaction that they facilitate.
B. Enzymes lower the activation energy for a specific reaction.
C. Enzymes increase the probability that any given reactant molecule will be converted to product.
D. Enzymes increase the average energy of reactant molecules.
A. False. Enzymes do not affect the initial energy of the reactants nor the final energy of the products after the reaction is complete, which are the values that determine the change in free energy of a reaction.
B. True.
C. True.
D. False. By lowering the energy of activation, enzymes increase the number of molecules in a population that can overcome the activation barrier.
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The relevance of the pseudocoelom to phylogeny has been questioned. Rotifera and Nematoda both have a pseudocoelom. The molecular evidence suggests which of the following conclusions?
A. Molecular evidence confirms that rotifers and nematodes are closely related and that both participate in the same monophyletic clade. B. Rotifers are more closely related to Lophotrochozoa than to nematodes. C. Rotifers are more closely related to echinoderms than to nematodes. D. Rotifers are more closely related to chordates than to nematodes. E. Rotifers are more closely related to nematodes than to mollusks.
Which process is absolutely necessary for asexual cellular reproduction to occur in eukaryotes?
a. prokaryotic fission b. mitosis c. meiosis d. doubling of chromosomal number in descendent cells e. growth factor activation
Humans have an extremely high level of genetic similarity, with greater than 99% sequence identity across populations. Yet, many people appear very different phenotypically. How do you reconcile these observations?
What will be an ideal response?
During protein synthesis, ribosomes:a
attach to the mRNA molecule and travel along its length to produce a polypeptide. b. attach to the DNA molecule and travel along its length to produce an mRNA molecule. c. translate mRNA into tRNA. d. transcribe DNA into mRNA. e. translate tRNA into protein.