In the presence of a metabolic poison that specifically and completely inhibits all function of mitochondrial ATP synthase, which of the following would you expect?
A) a decrease in the pH difference across the inner mitochondrial membrane
B) an increase in the pH difference across the inner mitochondrial membrane
C) increased synthesis of ATP
D) increased oxygen consumption
E) an accumulation of NAD+
Ans: B) an increase in the pH difference across the inner mitochondrial membrane
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DNA sequences in many human genes are very similar to the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that
A. convergent evolution led to the DNA similarities. B. humans evolved from chimpanzees. C. humans and chimpanzees share a relatively recent common ancestor D. humans and chimpanzees are not closely related. E. chimpanzees evolved from humans.
The ancestors of modern ________ performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.
A. Firmicutes B. Cyanobacteria C. Crenarchaeota D. Proteobacteria
Which nucleotide triplet specifies tryptophan?
a. UAA b. UAG c. UGG d. UGA
Arrange the events of a second messenger system in the correct order
1) Protein kinase is activated. 2) G protein is activated. 3) The neurotransmitter binds to its receptor. 4) The protein closes the potassium channel. 5) Cyclic AMP is produced. 6) Phosphorylation takes place. a. 1 ? 2 ? 5 ? 6 ? 4 ? 3 b. 3 ? 5 ? 6 ? 1 ? 2 ? 4 c. 5 ? 2 ? 6 ? 1 ? 3 ? 4 d. 3 ? 2 ? 5 ? 1 ? 6 ? 4 e. 5 ? 2 ? 6 ? 1 ? 4 ? 3