Analysis of the nucleotide sequence of the genome of Chlamydia trachomatis suggests that it may be able to synthesize some of its own ATP.
Answer the following statement true (T) or false (F)
True
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A bird that migrates to Canada during the summer and to the tropics in winter would be expected to have which type of muscle fiber dominating its "breast" meat (the pectoralis muscle that is used in flight)?
a. slow-twitch b. fast-twitch c. muscle that utilizes the glycolytic energy system d. smooth e. muscle that uses the immediate energy system
DNA replication
A) requires a type of RNA polymerase. B) is partially regulated by promoter/terminator sites. C) proceeds by making two continuous strands. D) is not edited once polymerization has occurred. E) is conservative.
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger radioactive signal than labeling the phosphates. Why won't this experiment work?
A. Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins. B. The phosphate in normal DNA is naturally radioactive. C. Although there are more nitrogens in a nucleotide, labeled phosphates actually have 16 extra neutrons; therefore, they are more radioactive. D. There is no radioactive isotope of nitrogen.
The pleomorphic bacterium (Coxiella/Legionella/Francisella) is an intracellular parasite that can lead to respiratory disease when inhaled in aerosols from freshwater sources
What will be an ideal response?