You decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the E. coli cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the semiconservative model of DNA replication is correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?
A. One band of intermediate density and one band of heavy density.
B. One band of intermediate density and one band of light density.
C. One band of intermediate density.
D. One band of heavy density and one band of light density.
E. One band of heavy density.
Answer: A
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A) 25W, 25X, 25Y, 25Z B) 40W, 30X, 20Y, 10Z C) 50W, 25X, 15Y, 10Z D) 70W, 10X, 10Y, 10Z E) 100W, 0X, 0Y, 0Z
Blood slows down in arterioles due to the large cross-sectional area.
a. true b. false
Some elongated fimbria are important in transferring DNA between bacteria
____________________ Indicate whether the statement is true or false.
Frameshift mutations result from the:a
substitution of one base pair for another. b. substitution of more than one base pair. c. insertion or deletion of one or two base pairs. d. substitution of a stop codon for an amino acid-specifying codon. e. substitution of a start codon for an amino acid codon.