Ultraviolet radiation at the bactericidal wavelength destroy bacteria by
A. destroying endospores.
B. damaging nucleic acid.
C. preventing spore formation.
D. denaturing proteins.
B
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When a stalled replication fork undergoes fork regression the next step:
A. can be repair of the lesion because it has become double-stranded again. B. can be degradation of the displaced strands followed by branch migration and continued replication. C. can be translesion synthesis to bypass the lesion. D. can be synthesis-dependent strand annealing (SDSA). E. All of the choices given are possible outcomes.
Over hundreds of millions of years, high pressure and temperature transformed ____ into deposits of oil and natural
gas.
a. coal b. land animal remains c. land plant remains d. plankton remains e. sedimentary rock
Which of the following is true concerning a morphological phylogenetic tree with 15 characters and 23 changes, and a molecular phylogenetic tree with 150 characters and 345 changes that contain the same taxa?
A. The molecular tree is a better estimate of the true relationships of the taxa. B. The molecular tree is the true representation of the relationships between the taxa. C. The morphological tree is the better estimate of the true relationships between the taxa because it has a shorter length. D. The morphological tree is the true representation of the relationships between taxa as it has the shorter length.
Which of the following statements is false?
(a) A mutation that arises in a mother's somatic cell often causes a disease in her daughter. (b) All mutations in an asexually reproducing single-celled organism are passed on to progeny. (c) In an evolutionary sense, somatic cells exist only to help propagate germ-line cells. (d) A mutation is passed on to offspring only if it is present in the germ line.