Which pathway shows the correct path of electron transfer from a molecule of FADH2?
A. succinate reductase ? ubiquinone ? cytochrome oxidase ? cytochrome b-c1 ? cytochrome c ? O2
B. succinate reductase ? ubiquinone ? cytochrome b-c1? cytochrome c ? cytochrome oxidase ? O2
C. ubiquinone ? cytochrome b-c1? cytochrome c ? cytochrome oxidase ? NADH hydrogenase ? O2
D. succinate reductase ? ubiquinone ? cytochrome b-c1? cytochrome c ? cytochrome oxidase ? O2
E. ubiquinone ? cytochrome b-c1? cytochrome c ? NADH hydrogenase ? cytochrome oxidase ? O2
B. succinate reductase ? ubiquinone ? cytochrome b-c1? cytochrome c ? cytochrome oxidase ? O2
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The branched intermediates generated by recombination can be resolved in a number of ways. Which of the following is true of branched intermediates and their resolution?
A. Resolution of the branched intermediate can occur by dissociation of the invading strands and reannealing with their original complements. Gaps are filled in by DNA polymerase and the DNA is sealed by ligase. This is known as synthesis-dependent strand annealing (SDSA). B. Resolution of the branched intermediate can proceed by double-strand break repair. Replication is completed by ligating the strands while they are still linked. Cleaving and rejoining the homologues can result in the original pair of chromosomes. C. Resolution of the branched intermediate can proceed by double-strand break repair. Replication is completed by ligating the strands while they are still linked. Cleaving and rejoining the homologues can result in crossing over between the chromosomes. D. Ligation of the branched intermediate formed by strand invasion results in two four-armed junctions called Holliday intermediates or junctions. E. All of the choices given are correct.
Biologists refer to the fit of an organism to its environment as _______.
a. selection b. adaptation c. resistance d. regulation
During X chromosome inactivation_____
a. female cells shut down b. RNA coats chromosomes c. pigments form d. female cells shut down and RNA coats chromosomes
Which of the following is not correctly paired?
a. eosinophil: lymphocyte b. T helper cell: activates B cells c. natural killer cell: lyses infected cells d. plasma cell: a subset of B cells e. B cell: involved in antibody mediated responses