If you could travel in a time machine back to the Cambrian Explosion, which animals would you expect to see commonly? Check all that apply.
_____ sponges.
_____ birds.
_____ reptiles.
_____ arthropods.
_____ flatworms.
__X__ sponges.
_____ birds.
_____ reptiles.
__X__ arthropods.
__X__ flatworms.
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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 intermediate density. B. One band of light density. C. One band of heavy density. D. One band of light density and one band of heavy density. E. One band of light density and one band of intermediate density. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about the Meselson-Stahl experiment? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A transgenic organism has recombinant DNA integrated into its genome
Indicate whether the statement is true or false
Which of the following represents the largest anthropogenic source of sulfur released to the atmosphere?
A) fixation for agricultural fertilizer B) burning of fossil fuels C) trash-burning incinerators D) biomass burning
Receptor tyrosine kinases (RTKs) are found at high levels on various cancer cells. A protein, Herceptin, has been found to bind to an RTK known as HER2. This information can now be utilized in breast cancer treatment if which of the following is true?
A) If Herceptin is found in the breast lymph nodes of the patient. B) If HER2, administered by injection, is in sufficient concentration. C) If the patient's cancer cells have detectable HER2. D) If the patient's genome codes for the HER2 receptor. E) If the patient's genome codes for the manufacture of Herceptin.