Which of the following is the best evidence that supercoiling is an intrinsic property of double-stranded DNA molecules?
A. Strand separation during transcription and replication introduces supercoiling.
B. Purified plasmid DNAs are supercoiled even though all proteins are removed.
C. When two strands of an entwined rubber band are pulled apart they will twist into supercoils.
D. Linear fragments of double-stranded DNA are not supercoiled.
E. None of these choices is correct.
B
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Nematodes
A. are roundworms. B. are found in the gastrointestinal tract or the blood. C. are carried by bacteria. D. have flat segmented bodies. E. are roundworms AND are found in the gastrointestinal tract or the blood.
Which factor is most responsible for the rapid population explosion of humans?
a. more prevalence of microorganisms to fight diseases naturally b. increasing availability of natural resources c. decreasing migration of human and animal populations d. decline in death rates without an equivalent decline in birth rates e. advances in reproductive technology
Approximately _____ of IVF pregnancies result in multiple births
a. 5% b. 10% c. 20% d. 50% e. 75%
Choose the one most appropriate answer for each.
A. Griffith B. Miescher C. Avery and McCarty D. Watson and Crick E. Hershey and Chase F. Chargaff G. Wilkins H. Franklin