Enzymes are catalysts because they function to:
A. supply the reactants
B. supply activation energy
C. raise activation energy
D. lower activation energy
Answer: D
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A eukaryotic transcription unit that is 8,000 nucleotides long may use 1,200 nucleotides to make a protein consisting of approximately 400 amino acids. This is best explained by the fact that
A. many nucleotides are needed to code for each amino acid. B. there are termination exons near the beginning of mRNA. C. many noncoding stretches of nucleotides are present in eukaryotic DNA. D. there is redundancy and ambiguity in the genetic code. E. nucleotides break off and are lost during the transcription process.
Which of the following correctly characterizes the F1 subunit of ATP synthase?
A. It is embedded in the inner mitochondrial membrane. B. It forms the channel through which protons flow. C. It is the catalytic unit that synthesizes ATP. D. None of these answer options correctly characterizes the F1 subunit of ATP synthase.
A person with celiac disease is hypersensitive to ____
a. milk products b. gluten c. nuts d. shellfish e. berries
Name the neuromuscular transmitter that is released into the synaptic cleft.
A. calcium ions B. creatine phosphate C. acetylcholine D. sodium ions E. ATP