Ms. Chambers students were in science lab trying to identify standard biomolecules: carbohydrates, fats and proteins. During the lab experience, Assistant Principal Matthews came in to evaluate their teacher and the learning environment. Ms.
Matthews reacted positively to the fact that the students were conducting a hands-in investigation, but she reacted
negatively to the overall classroom environment. Take a look at one lab group. Justify Ms. Matthews concern. What is
something Ms. Chambers should have done before the lab began?

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.

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

How long does it take a skateboarder going 6.0 m/s to come to a complete stop if she slows down at a rate of 2.0 m/s^2