Sodium (atomic #11) and chlorine (atomic #17) bind together to form sodium chloride (nacl), also known as salt. the type of bond that forms between these two elements is an ionic bond. choose the correct description for what is happening in each atom.

a. both atoms are stable and therefore do not need to share electrons.

b. sodium donates 1 electron, and chlorine accepts it.

c. chlorine donates 1 electron, and sodium accepts it.

d. sodium and chlorine share two valence electrons.

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.

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

The distribution of related animals and plants across the world