1. the following food chains are from an ecosystem
plant plankton -> shrimp -> herring
plant plankton -> animal plankton -> herring
plant plankton -> animal plankton -> sand eel -> cod
plant plankton -> animal plankton -> mackerel -> cod
a) draw a food web from the food chains
b) what two terms can be used for the shrimp and animal plankton?
c) what two terms can be used for the herring, sand eels and mackerel?
d) suggest where this ecosystem would be found?

Look at the images of different rocks. which rocks have a fine-grained texture? check all that apply. 1 2 3 4 5

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.