The cells of many bacterial species have the ability to differentiate (sometimes permanently) for purposes that enhance species survival in various ways. Such differentiation is typically accompanied by major changes in gene expression or cell structure. Which of the following represents a differentiated cell type? There are at least two correct answers. Choose one or more: A. Anabaena heterocyst B. Bacillus endospore C. flagellated Pseudomonas D. Caulobacter with holdfast E. Staphylococcus cluster F. Streptomyces aerial hyphae G. E. coli siderophore

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

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.

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?