During rounds of PCR, complementary strands of DNA form ________
a. in the presence of dideoxynucleotides
b. when the mixture is cooled
c. in the absence of primers
d. when the mixture is heated
b
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Amino acid sequences that are rich in lysine and protrude from the histone proteins in the nucleosome are called "tails."
A. true B. false
How many different classes of neurons are
involved in most nervous systems?
a. 1 b. 2 c. 3 d. 4 e. 5
Scientists are always thinking about ways to improve experimental design. In the text's potato chip experiment, which
of these changes would produce the most effective design?
a. Show a different movie. b. Exclude teenagers as group members. c. Collect uneaten chip remains and weigh them for both groups. d. Provide free drinks before the experiment. e. Use a smaller theater.
Your colleagues are attempting to study the citric acid cycle in the lab. To do so, they have dissolved oxaloacetate in water, then stirred in sufficient quantities of every required enzyme, coenzyme, and oxidizing agent, before adding ADP and acetyl CoA. After waiting a sufficient period of time, they test the solution for ATP and are disappointed to find significantly less ATP than expected. What is the flaw in their experiment?
a. Pyruvate dehydrogenase is not water soluble and is unable to convert pyruvate into acetyl CoA outside mitochondria. b. Stirring the solution will introduce oxygen molecules, which will bond to ADP, preventing further phosphorylation. c. Without subsequent pathways to oxidize NADH and FADH2, no NAD+ and FAD are available to continue the cycle. d. ADP molecules spontaneously dephosphorylate in the presence of acetyl CoA outside of mitochondria.