The cell wall of a plant is made of cellulose, the exoskeleton of an insect is made of chitin, and corn is composed of starch molecules. What is the best argument to support the claim that cellulose, chitin, and starch are made from the same elements? 1)The nucleic acids used in the production of sugar during photosynthesis are linked together to form the different molecules.

2) The chemical elements used in the production of sugar during photosynthesis are linked together to form the different molecules.

3) The oxygen used in the production of sugar during photosynthesis are linked together to form the different molecules.

4) The carbon dioxide used in the production of sugar during photosynthesis are linked together to form the different molecules.

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

The dna in a cell’s nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell. for example, consider these two proteins: phosphofructokinase (pfk) is an enzyme that functions in the cytoplasm during glycolysis. insulin, a protein that regulates blood sugar levels, is secreted from specialized pancreatic cells. assume that you can track the cellular locations of these two proteins from the time that translation is complete until the proteins reach their final destinations.for each protein, identify its targeting pathway: the sequence of cellular locations in which the protein is found from when translation is complete until it reaches its final (functional) destination. (note that if an organelle is listed in a pathway, the location implied is inside the organelle, not in the membrane that surrounds the organelle.)

When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page