About 1.2 billion years ago, eukaryotic and multicellular organisms evolved because

Are Environmental influences able to change the gene pool of a population.

On a phylogenetic tree, what do the branch lengths represent? The age of the organisms amount of genetic change since divergence amount of genetic change since convergence The age of divergence

Because you can't be high or low. Does airflow from low to high pressure or high from two low pressure?

What is responsible for transport of amino acids to the ribosome during protein synthesis?

You assay cell surface oligosaccharides from a blood sample. After determining the composition of the oligosaccharides relative to a reference monosaccharide, fucose, you conclude the donor is blood type B. What brought you to this conclusion?

One of the primary functions of DNA in cells is to A. Serve as a storage firm for unused nucleotides B. Occupy space in the nucleus to keep the nucleus from collapsing C. Copy itself exactly for new cells

What feature do lymphatic vessels share with veins that allows lymph to flow in only one direction?

The negative stain is used to the negative stain is used to determine cell size. visualize endospores. determine flagella arrangement. visualize the outer membrane. determine gram reaction.

The visible part of the ear has the ability to stretch significantly, and then recoil back to its original position. Which protein fiber must be present?

Which cellular process takes place in the ribosome that are bound to the endoplasmic reticulum