Clays often have charged surfaces. How may this have been important in the formation of organic macromolecules?
A. They are a source of ATP to run chemical reactions.
B. They are a source of oxygen to break down organic building blocks.
C. They can form templates by binding organic building blocks.
D. They form covalent bonds with organic building blocks.
E. They are formed from meteorites that carried organic molecules to Earth.
C. They can form templates by binding organic building blocks.
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You have isolated what appears to be alien DNA. While studying its replication, you performed the exact experiment Meselson and Stahl did. After three generations, the DNA is subjected to a CsCl gradient and only one band appears
What type of replication does this DNA undergo? A. Semiconservative B. Conservative C. Dispersive
In Meselson and Stahl’s experiments on E. coli, why was it necessary for the DNA produced in 15N- and 14N-rich media to be loaded into a gradient before being spun in a centrifuge?
a. The gradient provided a cushioning effect, preventing damage to the DNA. b. The gradient prevented the DNA molecules from denaturing outside of the cell. c. The gradient enhanced buoyant density, creating more discernible bands. d. Centrifuges do not function unless the samples are more massive than just DNA.
Which of the following is a shared characteristic of prokaryotic and eukaryotic organisms?
a. capsule b. ribosomes c. pili d. nucleoid
What is the thin, muscular tube through which urine leaves each mammalian kidney?
A) Ureter B) Collecting duct C) Nephron D) Bladder E) Urethra