Site-directed mutagenesis is a method in biochemistry/ molecular biology that introduces small changes into the DNA sequence of a gene. This change alters the amino acid sequence of a protein and can alter the function of a protein. What changes are typically inserted into the DNA sequence?
All of the listed statements are true.
deletion Single
base substitution
Short insertion

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.

What was the land like over 500 million years ago? what was under the sea?

Which would be the most useful source of evidence to support mcneill's contention?