Audrey is reading a chemistry research paper and comes across an unfamiliar scientific procedure. which pair of sources would best her learn about the procedure? which pair of sources would serve as appropriate starting points of research? a) a textbook and a science encyclopedia b) a science journal and an internet source c) a database article and wikipedia encyclopedia eliminate d) an advertising internet site and a database article

The body is protected against harmful flu viruses by

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.

Contrast how pollination is different among gymnosperms and angiosperms.