Which of the following represents a conversion of kinetic energy to potential energy?
(a) chemical energy in food is converted to energy of muscular motion in the human body.
(b) an animal converts chemical energy from food to thermal energy to maintain its body temperature.
(c) chemical energy is converted to thermal energy when a log is burned.
plants convert solar energy to chemical energy via photosynthesis.

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.

Regarding most of the narrator’s story, which word best describes the tone?

Which locations on the map are low-pressure areas? a b c d e