Define convection
the exchange of heat by the emission of energy via electromagnetic waves
the exchange of heat between an animal’s body and the surfaces it is touching, such as the ground
the warming of tissue by the production of heat from metabolism
the loss of heat by the heat transferred from the body to water as it is converted from a liquid to a gas
the exchange of heat when heat is transferred to a fluid, such as air or water

2. what process do mrna and trna work together to complete? (3 points)

Which codon is the code for the amino acid histidine (his)?

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.