Discussion Topic Chemical energy sources are often portable and provide large amounts of energy
Fossil fuels are one kind of chemical energy source. Most of the energy we use in the
United States is generated by the combustion of fossil fuels. However, fossil fuel
combustion adds greenhouse gases to the atmosphere, mostly CO2. One measure of
the total amount of greenhouse gases that are emitted into the atmosphere each year
is called a carbon footprint. Read this article to compare the carbon footprint of an
average person in the United States to an average person around the world.
Knowing that greenhouse gases are contributing to climate change, how can we reduce
our carbon footprint, particularly in the United States? Could hydrogen fuel replace
fossil fuels in the future? Why or why not? Should the size of a person's carbon footprint
be limited by law? Why or why not?

Mouse liver cells were homogenized and the homogenate subjected to equilibrium density-gradient centrifugation with sucrose gradients. fractions obtained from these gradients were assayed for marker molecules (i.e., molecules that are limited to specific organelles). the results of these assays are shown in the figure. the marker molecules have the following functions: cytochrome oxidase is an enzyme involved in the process by which atp is formed in the complete aerobic degradation of glucose or fatty acids; ribosomal rna forms part of the protein-synthesizing ribosomes; catalase catalyzes decomposition of hydrogen peroxide; acid phosphatase hydrolysis monophosphoric esters at acid ph; cytidylyltransferase is involved in phospholipid biosynthesis; and amino acid permease aids in transport of amino acids across membranes. a) name the marker molecule and give the number of the fraction that is most enriched for each of the following cell components: lysosomes; peroxisomes; mitochondria; plasma membrane; rough endoplasmic reticulum; smooth endoplasmic reticulum.