How did Okazaki show that DNA synthesis is semidiscontinuous?
What will be an ideal response?
Okazaki proposed that DNA synthesis was discontinuous on the lagging strand, needing to reinitiate as the DNA duplex unwound. This repeated initiation would generate short fragments that would have to be connected. The evidence for this mechanism came from growing T4-infected bacteria on radioactive nucleotides for brief time intervals and then analyzing the resulting DNA on CsCl gradients. Small fragments were observed as predicted.
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Diploid organisms use meiosis to produce haploid cells. Meiosis consists of how many rounds of nuclear division?
A. one B. two C. three D. four E. none of these
________ RNA is a component of the ribosomes that serve as the site of protein synthesis.
Fill in the blank(s) with the appropriate word(s).
The normal sex chromosomal combination for a human female is
A. XYY. B. XY. C. YY. D. XX. E. XXX.
During extended periods of dehydration, tardigrades ____
a. enter suspended animation b. migrate to the soil subsurface c. enter small ponds and lakes d. climb inside a plant leaf and form cysts
e. replace the water in their cells with salt