If a dog is relaxed, alert, and confident as evidenced by its ears up or relaxed naturally and its eyes bright and alert with good contact, the dog’s tail will most likely be
a. sticking straight out behind.
b. held loosely and lowered behind its body.
c. stiff and lifted straight in the air.
d. fully tucked under its body between its legs.

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.

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

Match each symbol with its description.