The schematic below shows the amino acid sequence of several proteins in cartoon format. the white boxes represent 20-30 hydrophobic amino acid stretches and the dark boxes represent domains with mostly hydrophilic amino acids. amino acid schematics histone deacetylase is represented by which of the amino acid sequences above (a-d).

Pepsin is an enzyme in the stomach that breaks polypeptides into amino acids. pepsin functions best at a ph of around 1.5. what would be the most likely result if the ph of the stomach were increased to 5

How do you date a sample of rock that you suspect as being one of the earliest on earth

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits