You briefly expose bacteria undergoing DNA replication to radioactively labeled nucleotides. When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes
One class of labeled DNA includes very large molecules (thousands or even millions of nucleotides long), and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length). These two classes of DNA probably represent _____. A) leading strands and Okazaki fragments
B) lagging strands and Okazaki fragments
C) Okazaki fragments and RNA primers
D) leading strands and RNA primers
A
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The sporophyte generation is clearly larger, more complex, and longer living than the gametophyte
generation in
a. bryophytes. b. seedless vascular plants. c. seed plants. d. seedless vascular plants and seed plants. e. all plants.
Why is the Lineweaver–Burk plot important in enzyme kinetics?
A) It is a single-reciprocal plot. B) It illustrates enzyme specificity. C) It reveals the presence of prosthetic groups in enzymes. D) It makes it easier to determine Vmax and Km. E) It is nonlinear.
Which of the followings statements concerning the preprophase band is false?
a. It appears just prior to mitosis. b. It helps orient the mitotic spindle. c. It determines the plane of cell division d. It is found in both plant and animal cells. e. It is composed of microtubules.
Despite the fact that skin-to-skin contact is important in establishing bonding between babies and their caregivers, that same contact can also expose them to pathogens. You have been asked to teach a short class for child care workers to help them identify highly contagious diseases that can cause outbreaks in their environment. Which two of these conditions are most common and most infectious in babies?
A. Impetigo and ringworm B. Ringworm and hand, foot, and mouth disease C. Impetigo and cellulitis D. Conjunctivitis and rubella E. Impetigo and conjunctivitis