Question

15) The SAR dade is a diverse group of eukaryotes. Why are they grouped together! Excavata Diatoms Golden algae Stramenopiles Brown algae Dinoflagellates Apicomplexans Alveolates Ciliates Forams SAR clade Cercozoans Radiolarians Rhizarians Archaeplastida Unikonta A) they are all single celled C) they all have stiff shells or pseudopods b) they all have at least one taga D) they don't fit in the other perigos Use the following information to answer the question(s) below Paulinella chromatophora is one of the few cercozoans that is autotrophic, carrying out aerobic photosynthesis with its two elongated "chromatophores. The chromatophores are contained within vesicles of the host cell, and each is derived from cyanobacterium, though not the same type of cyanobacterium that gave rise to the chloroplasts of algae and plants 16) The genome of plant chloroplasts is roughly 50% the size of the genome of the cyanobacterium from which it is thought to have been derived. In comparison, the genome of P. cromatophora's chromatophore is only slightly reduced relative to the size of the genome of the cyanobacterium from which it is thought to have been derived What is a valid hypothesis that can be drawn from this comparison? A) The genome of the cyanobacteria was smaller than the genome of P. chromatophora. B) The genome of the chloroplast ancestor contained many more introns that could be lost without harm, compared to the chromatophore's genome. C) Lytic phage infections have targeted the chloroplast genome more often than the P. chromatophora genome. D) P. chromatophora's chromatophore is the result of a more recent endosymbiosis than other eukaryotes 17) Why does the chloroplast genome in plants still function with 50% of the genes needed for a free living cyanobacterim? A) nature removed unnecessary genes B) some genes were transferred horizontally to the nucleus of plants C) genes not required for chloroplast function have not been preserved by natural selection D) it would work better with all the genes, but evolution cannot select perfection

Answer 1

Answer15: The kingdom protista contains mostly unicellular eukaryote. The taxonomic grouping of microorganisms is totally based on the cellular structure and the life style based on molecular studies. The individual in the clade are eukaryotes (having nucleus and membrane bounded organellesorganelles) among which most are unicellular. The members of this group have a common characteristics that they all having at least one flagellum. Therefore, option (d) is correct.

Answer17: Chloroplast genome are relatively conserved among land Plants in term of structure, size and gene content. During the course of evolution certain of the chloroplast genes wer transferred to nucleus and this process is still ongoing. This process of genetic transfer is due to lateral and horizontal genetic material transfer between organisms. The intracellular gene transfer in an organsisms is common to both prokaryotes and eukaryotes rather than theough sexual reproduction or vertical gene transfer. Therefore, option (b) is correct.