14. Which unicellular organism is the most closely related to metazoans? (2 poin

Question

14. Which unicellular organism is the most closely related to metazoans? (2 points) a. Choanoflagellate b. Amoeba c. Chlamydomonas d. Paramecium 15. Shown below is a diagram indicating the phylogenetic distribution of different types of cell junctions across the Metazoa. Abbreviations for the cell junctions shown are as follows: Tight Junctions (TJ); belt Adherens Junctions (belt-AJ); spot adherens junctions (spot-AJ), GAP junctions (GJ), Focal Adhesions (FA), Septate Junctions (SI). Based on the diagram, which cell junction(s) were likely present in the common ancestor of all metazoans? Explain your answer. (3 points) a. Which cell junction(s) were likely present in the common ancestor of Bilateral animals (invertebrates and vertebrates)? Explain your answer. (3 points) b. Page 4 of4

Explanation / Answer

Ans 14...A...choanoflagelletes

Choanoflagelletes has been selected to be the closely related to metazoans because of the common characters

Ans 15..A...As u can see in the flow chart

The common junction that is present in all of the classes is FA that is focal adhesions.other junction are present in some and absent in some so most common junction that was present in all ancestor is FA

Ans 15..b...If u look the junction in vertebrates and invertebrates ,common are FA,beltAJ,GJ.so there common ancestor should have FA,beltAj and GJ

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