True or False. Data from phylogenies based on living organisms and data from the fossil record are in agreement when the tree of life is examined as a whole, but are often contradictory when individual branches are examined
A. true
B. false
B
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Gram-negative bacteria are less susceptible to complement lysis than Gram-positive bacteria
Indicate whether this statement is true or false.
_____ is(are) formed during the oxidation of pyruvate to acetyl CoA
1.Glucose 2.CO2 3.NADH+ 4.ATP 5.Both NADH+ and CO2
Amniocentesis involves sampling
a. the fetus directly. b. the fetal cells floating in the amniotic fluid. c. sperm. d. blood cells. e. placental cells.
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 conservative model of DNA replication was correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?
A. One band of light density. B. One band of intermediate density. C. One band of light density and one band of intermediate density. D. One band of light density and one band of heavy density. E. One band of heavy density.